Sicam_AI32 16 Module

7/29/2019 Sicam_AI32 16 Module

1/84

SICAM RTU

Analog Input FunctionModules AI32/AI16

6MD1031

/

32

Manual

Version: 2.0

Release: August 24, 1999

E50417-G8976-C004-A2

Foreword

Features of theAnalog Input Modules 1Setup and Connection 2Functions of theAnalog Input Modules 3

Operation and Use 4

Service and Diagnostics 5

Technical Specifications 6AppendiAccessories and Replacement Parts

Glossary, Index


2/84

Notes on safet This manual does not represent a complete directory of all safety measures required for operation ofthe product (module, device) since special operating conditions may require additional measures.

However, this manual does contain notes which must be adhered to for your own personal safety

and the avoidance of property damage. These notes are highlighted with a warning triangle and the

degree of danger as shown below:

Danger

means that death, severe injury or substantial property damage will occur if the appropriate

precautionary measures are not taken..

Warning

means that death, severe injury or substantial property damage may occur if the appropriate

precautionary measures are not taken..

Caution

means that minor injury or property damage may occur if the appropriate precautionary measures

are not taken.

Note

indicates important information on the product, the handling of the product or a particular part of

the documentation requiring special attention.

Qualified personnel Commissioning and operation of a product (module, device) described in this manual may only beperformed by qualified personnel. In the sense of the safety notes contained in this manual,

qualified personnel are those persons who are authorized to commission, release, ground and tag

devices, systems and electrical circuits.

Use as intended Special attention is called to the following information:

WarningThe product (device, module) may only be used for the individual applications stated in the catalog

and the technical description. The product may only be used with Siemens devices and components

or with devices and components of other manufacture recommended or approved by Siemens.

Correct and safe operation of the product requires suitable transportation, storage, setup and

installation, and use and maintenance.

During operation of electrical products, it is unavoidable that certain parts of these products are

under dangerous current. Severe injury or property damage can occur if work is not performed

properly or behavior is not appropriate.

Before connecting any connections at all, ground the product to the protective conductorconnection.

Dangerous voltages may be present on all switching components connected to the voltagesupply.

Even after the supply voltage has been disconnected, dangerous voltage may still be present inthe product (capacitor storage).

Products with current converter circuits may not be operated while open.

The limit values stated in the manual or in the operating instructions may not be exceeded. Thisalso applies to testing and commissioning.

Non-Liability Clause

Although we have checked the contents of this publication for

conformance with the hardware and software described, we cannotguarantee complete conformance since differences cannot be ruled out.

The information in this manual is checked at regular intervals, and

necessary corrections are included in the next release. Your suggestions

are welcome.

Subject to change without prior notice.

Siemens Aktiengesellschaft.

Copyright

Copyright Siemens AG 1999 All Rights Reserved

Passing on or reproduction of this document, and utilization andrevelation of its contents is not permitted without express permission.

Violations shall be cause for damage claims. All rights reserved, in

particular when a patent is issued or a general model registered.

Registered trademarks

SICAM, SINAUT, SIMATIC and SINEC are registered

trademarks of SIEMENS AG.

Book-No. E50417-G8976-C004-A2


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SICAM Analog Input Modules AI32/16 - Manual

Siemens AGi

Foreword

Contents of thismanual

This manual is divided into the following topics.

Features of the module

Examples of setup and connection

Function description

Notes on operation and operator control

Information on service and diagnostics

Technical specifications

Additionalliterature

This manual describes the analog input function modules.

The following manuals will provide you with information on programming and

the SIMATIC S7-400 and SICAM RTU systems.

Manual Contents Order Number

Manual

Programmable Controler

S7-400/M7-400

Setup and commissioningof the S7-400/ M7-400system

6ES7498-8AA02-8BA0

Documentation Package

STEP7 Basis Information

Installation, configuration

and parameterization ofthe S7-400 System plus

structuring and prepa-

ration of programs for the

S7-400 syste

6ES7810-4CA02-8BA0

Reference Manuals for

STEP7

STL and LAD manuals

and reference manuals

for standard and system

functions for SIMATIC

S7-300/400

6ES7810-4CA02-8BR0

Manual

System SICAM RTU

System description of the

SICAM RTU System

E50417-S8976-C002

Manual

System SICAM SAS

System description of the

SICAM SAS Syste

E50417-S8976-C009


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Foreword

ii SICAM Analog Input Modules AI32/16 - Manual Siemens AG

Notes to thismanual

This manual provides you with the following aids to make it easier to locate the

information you are looking for.

At the beginning of this manual, you will find a complete table of contentsplus separate lists of figures and tables contained in this manual.

In the individual chapters, you will find information in the left margin ofeach page which will give you an overview of the contents of that particular

paragraph.

Following the appendices, you will find a glossary containing definitions ofthe important technical terms and abbreviations used in this manual.

At the end of this manual, you will find a comprehensive index for fastaccess to the information you need.

Validit This manual is valid for the following modules.

Analog input AI32 Order number 6MD1031-0AA00Release 01

Analog input AI32 Order number 6 MD1031-0BA00Release 01

Analog input AI16 Order number 6 MD1032-0AA00Release 01

Analog input AI16 Order number 6 MD1032-0BA00Release 01

This manual will not be withdrawn when changes occur.

Standards These analog input modules have been developed in accordance with theISO 9001 guidelines.

Training courses See our catalog of courses for a list of available courses, or contact one of ourtraining centers.

Training Center, Nuernberg

EV S SUP

AAAA 0911 / 433-7005

FAX 0911 / 433-8592

Questions If you have questions on the analog input function modules, contact yourSiemens representative.


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Siemens AGiii

Table of Contents

1 Features of the Analog Input Modules ................................................................... 1-1

1.1 Ordering Data ................................................................................................ 1-21.1.1 Electronic Analog Input Module AI32 ............................................................ 1-2

1.1.2 Analog Input Relay Module AI16 ................................................................... 1-2

1.2 Features of the Analog Input Modules ........................................................... 1-3

1.3 Circuiting Principle ......................................................................................... 1-4

2 Setup and Connection ............................................................................................. 2-1

2.1 Construction Elements of the Analog Input Modules ..................................... 2-2

2.1.1 The Module .................................................................................................... 2-3

2.1.2 Front Plug Connector ..................................................................................... 2-4

2.2 Connection Allocation .................................................................................... 2-5

2.2.1 Allocation of the AI32 ..................................................................................... 2-5

2.2.2 Allocation of the AI16 ..................................................................................... 2-6

2.3 Installation and Wiring ................................................................................... 2-7

2.4 Connection Technique for Prevention of Measured Value Distortion ............ 2-9

2.4.1 Undesired Coupling of Current Circuits ......................................................... 2-9

2.4.2 Shielding as a Method of Reducing Undesired Interference Coupling....2-12

2.4.3 Connection of Floating Measured Value Encoders ....................................... 2-14

2.4.4 Connection of Non-Floating Measured Value Encoders ................................ 2-15

3 Functions of the Analog Input Modules .................................................................. 3-13.1 Processing Principle ...................................................................................... 3-2

3.1.1 Process Image ............................................................................................... 3-3

3.1.2 Event Buffer ................................................................................................... 3-4

3.2 Measured Value Acquisition .......................................................................... 3-5

3.3 Description of Analog Value Representation ................................................. 3-6

3.3.1 Analog Value Representation in the Process Image of the Inputs (PAE) ...... 3-6

3.3.2 Analog Value Representation in the Event Buffer (EPE) ............................... 3-7

3.4 Current or Voltage Input ................................................................................ 3-12

3.5 Overlapping Function ..................................................................................... 3-13

4 Operation and Use.................................................................................................... 4-1

4.1 Configuring and Parameterizing ..................................................................... 4-2

4.2 Data of the AI32/16 ........................................................................................ 4-7

4.2.1 Reading Out the Process Image of the Inputs (PAE) .................................... 4-7

4.2.2 Reading Out the Event Buffer (EPE) .............................................................. 4-7

4.2.3 Data Transfer Formats of the Event Buffer ................................................... 4-9

4.3 Control Jobs to the AI32/16 Module .............................................................. 4-10


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Table of Contents


Siemens AGiv

5 Service and Diagnostics .......................................................................................... 5-1

5.1 Operational and Diagnostic Indicat ............................................................... 5-2

5.2 Diagnostic Data Records ............................................................................... 5-3

5.2.1 Reading Out the Version Identifier ................................................................. 5-45.3 Diagnostic Data in the Event Buffer (EPE) ................................................... 5-6

5.3.1 Transfer Format of the Diagnostic Data in the Event Buffer ......................... 5-6

5.3.2 System Events ............................................................................................... 5-8

5.4 Diagnostic Interrupt (DAL) ............................................................................. 5-9

5.5 Diagnostic Data via System Function Call (SFC) .......................................... 5-10

5.6 Self-Monitoring ............................................................................................... 5-12

6 Technical Specifications.......................................................................................... 6-1

Appendix ................................................................................................................... Appendix-1A Accessories and Replacement Parts .................................................. Appendix-2

Glossar .................................................................................................................... Glossary-1

Index ......................................................................................................................... Index-1


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Table of Contents


Siemens AGv

Figures

Figure 1-1 Circuit diagram of the analog input modules .......................................................... 1-4

Figure 1-2 Principle of the input circuit of the AI32 ................................................................ 1-5Figure 1-3 Principle of the input circuit of the AI16 ................................................................ 1-5

Figure 2-1 View of the AI32/16 and its most important construction elements ........................ 2-2

Figure 2-2 Connection allocation of the AI32........................................................................... 2-5

Figure 2-3 Connection allocation of the AI16........................................................................... 2-6

Figure 2-4 Example of cabling with the transfer module .......................................................... 2-8

Figure 2-5 Measured value distortions caused by grounding loops........................................... 2-10

Figure 2-6 Measured value distortions caused by capacitive voltage coupling......................... 2-10

Figure 2-7 Measured value distortions caused by inductive current coupling........................... 2-11

Figure 2-8 Measured value distortions caused by electromagnetic fields ................................. 2-11

Figure 2-9 Suggestion for shielding the measuring lines using wiring with cable clamps ........ 2-12

Figure 2-10 Suggestion for shielding the measuring lines using series intermediate terminals ... 2-13

Figure 2-11 Connection of floating measured value encoders to the AI32 ................................. 2-14

Figure 2-12 Connection of floating measured value encoders to the AI16 ................................. 2-14

Figure 2-13 Connection of non-floating measured value encoders to the AI32 ......................... 2-15

Figure 2-14 Connection of non-floating measured value encoders to the AI16 .......................... 2-15

Figure 3-1 Relationship between function and processing........................................................ 3-2

Figure 3-2 Flow chart of cyclic processing ............................................................................... 3-3

Figure 3-3 Flow chart of spontaneous processing..................................................................... 3-4

Figure 3-4 Principle of the additive threshold value function ................................................... 3-5

Figure 3-5 Connection of measuring converters on current inputs............................................ 3-12

Figure 4-1 Menu window for the configuration ....................................................................... 4-2Figure 4-2 Menu window for general parameters...................................................................... 4-3

Figure 4-3 Menu window for the logical addressing of the AI32/16 module ........................... 4-3

Figure 4-4 Menu window for entry of the basic parameters...................................................... 4-4

Figure 4-5 Menu window for channel-related parameters ........................................................ 4-4

Figure 4-6 Menu tree for AI32/16 with current inputs .............................................................. 4-5

Figure 4-7 Menu tree for AI32/16 module with voltage inputs................................................. 4-6

Figure 5-1 Menu window for enabling the diagnostic interrupt ............................................... 5-9


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Table of Contents


Siemens AGvi

Tables

Table 1-1 Ordering numbers for the AI32............................................................................... 1-2

Table 1-2 Order numbers for the AI16.................................................................................... 1-2Table 3-1 Analog value representation in the process image of the inputs.............................. 3-6

Table 3-2 Analog value representation in the event buffer...................................................... 3-7

Table 3-3 Representation of the measured value resolution.................................................... 3-8

Table 3-4 Resolution of the measuring ranges for input range of current 24 mA and

voltage6 V .......................................................................................................... 3-9

Table 3-5 Resolution of the measuring ranges for input area of current 20 mA/4 to 20

mA and voltage 10 V........................................................................................... 3-10

Table 3-6 Resolution of the measuring ranges for input range of current 1 mA and

voltage1 V .......................................................................................................... 3-11

Table 4-1 Additional information of the PRAL ...................................................................... 4-8

Table 4-2 Header of the event buffer entries .......................................................................... 4-8

Table 4-3 Data transfer format for measured values in the event buffer ................................ 4-9

Table 4-4 Relationship of the value to the type of processing ................................................. 4-9

Table 4-5 Control jobs to the AI32/16 .................................................................................... 4-10

Table 4-6 Data transfer format for "enable process/general check ....................................... 4-10

Table 4-7 Data transfer format for "set time ......................................................................... 4-11

Table 5-1 Operational and diagnostic indicators..................................................................... 5-2

Table 5-2 Data transfer format for "read version identifier .................................................. 5-4

Table 5-3 Data transfer format for "read version identifier ................................................. 5-5

Table 5-4 System events which trigger a data record ............................................................ 5-6

Table 5-5 Transfer format for single errors in the event buffer .............................................. 5-7Table 5-6 Additional information of the DAL diagnostic interrupt ....................................... 5-9

Table 5-7 Basic diagnostic data of AI32/16 command output .............................................. 5-10

Table 5-8 Expanded diagnostic data of the AI32/16 command output ................................... 5-11

Table 6-1 Technical specifications of the AI32/16 analog input function modules ................ 6-2

Table 7-1 Accessories and replacement parts................................................................ .......... Append-2


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Siemens AG1-1

1 Features of the Analog Input Modules

Features of the AnalogInput Modules 1Introduction Floating analog input modules are available with the SIMATIC S7-400 for

inputting analog process signals.

Using measured value encoders, these modules permit acquisition of 16 or 32

analog process signals. Acquisition is galvanically isolated and immune to

interference.These modules have been designed for a wide variety of applications in systems

involving the automation of geographically widespread processes which require

safe and reliable acquisition of information and increased resistance to

interference caused by environmental factors and electromagnetic fields.

Purpose of thischapter

This chapter provides you with an overview of the functions of analog input

modules. Based on this information, the user can decide which functions are

required for his/her problem solution.

Contents of thischapter This chapter contains information on the following topics. A list of the most important features of the module

A presentation of the circuiting

A short description of the most important functions on the module


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Features of the Analog Input Modules


Siemens AG1-2

1.1 Ordering Data

1.1.1 Electronic Analog Input Module AI32

Table 1-1 Ordering numbers for the AI32

Function Module Order Number

Analog Input AI32 6MD1031-0AA00

Potential isolation against internal electronics32 current inputsfor IEnom0.5 mA to 24 mA

Analog Input AI32 6MD1031-0BA00

Potential isolation against internal electronics32 voltage inputsfor UEnom 0.5 V to10 V

1.1.2 Analog Input Relay Module AI16

Table 1-2 Order numbers for the AI16

Function Module Order Number

Analog Input AI16 6MD1032-0AA00

Potential isolation against internal electronicsPotential isolation between the inputs16 current inputsfor IEnom0.5 mA to 24 mA

Analog Input AI16 6MD1032-0BA00

Potential isolation against internal electronicsPotential isolation between the inputs16 voltage inputsfor UEnom 0.5 V to10 V


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Siemens AG1-3

1.2 Features of the Analog Input Modules

The AI32 and AI16 modules are used to acquire and further process analog

measured values. With their own processors on board, these modules are able

to handle an increased number of functions (e.g., interference suppression, high-resolution time stamping of all process status changes and their intermediate

storage, and processing of parameterizable functions for threshold value

monitoring, among others).

The primary features are listed below.

Compact 1 slot for 32 (AI32) or 16 (AI16) analog inputs

Screw-type terminals for flexible wires up to 1.5 mm

Process connections and operational/diagnostic indications on the front

Sturdy Enapsulated, self-contained construction, protection rating of IP20

No fan required

Protected against touch

Interference-proof Potential isolation of the measured value inputs up to 2.5 kVeff Surge voltage up to 5 kV

Electrical fast transient (burst) up to 2 kV

Surge immunity up to 2 kV

Parameterizable interference voltage suppression

All-purpose Wide input current range 0.5 mA to 24 mAor input voltage range 0.5 V to10 V

Cyclic acquisition of the current analog measured value (PAE)

Event-controlled, spontaneous processing of the analog process signalchanges (threshold value exceeded)

Event buffer for up to 100 events

Functional conditioning (e.g., interference voltage suppression and thresholdvalue processing, among others)

Real time Acquisition of analog process signal changes in the order in which theoccurred

Time management on the module, resolution of1 msec

Safe and reliable Continuous self-tests on the module

Self-diagnosis of the function units

Watchdog

Version recognition of the analog input modules

See chapter 6 for detailed technical specifications.

Figure 1-1shows the circuiting principle.


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Siemens AG1-4

1.3 Circuiting Principle

Circuit diagram The figure below shows the principal circuiting for both analog input modules(i.e., AI32 and AI16).

hb_

ai_fg

Potential isolation 2.5kV

Monitoring functions

System bus control

ASIC

LED control

INTF EXTF

S7 system bus

Inter

nalcontrolbus

Internaldatabus

E0 E1(E15P)E30

Multiplexer

Referencevoltages

EPROM

RAMMicroprocessor1-msec time stamp

DCDC

Process inputs

PAE, EPE

Error indications

E31(E15N)

A/D converterAutomatic calibrationProgrammable amplif.

Watchdog

ResetVersion identifier

Measuring resistorsOvervolt. prot.

RUN

(E0P) (E0N)

Figure 1-1 Circuit diagram of the analog input modules

Abbreviations used:

INTF Internal error PAE Process image of the inputs

EXTF External error EPE Event buffer of the inputs

RUN Operational indication

ASIC Application-specific,

integrated circuit


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Siemens AG1-5

Input circuit of theAI32

The figure below shows the input circuit of the AI32.

The AI32 is equipped with 32 floating analog inputs with a common root.

hb_

ai_se

GND

E0

+

4

8

Potentialisolation

2.5 kV

Analog/digital

converter

CMOSmultiplexer

UP

Pin no. of multipointterminal strip

Input

ADC

UN

UP

UN

Resistanceconverter

FilterShuntfor

currentinputs

Terminals

Referencevoltage

infront

connector

PGA

Figure 1-2 Principle of the input circuit of the AI32

Input circuit of theAI16

The figure below shows the input circuit of the AI16.

The AI16 is equipped with 16 floating analog inputs which are differentiall

multiplexed with 2-way relays.

hb_

ar_se

GND

E0P +4

5

E0N

Potentialisolation

2.5 kV

Analog/digital

converter

Relaymultiplexer

UP

Pin no. of multipointterminal strip

Input

UN

Resistanceconverter

FilterShuntfor

currentinputs

Terminals

Referencevoltage

infront

connector

ADC

PGA

Figure 1-3 Principle of the input circuit of the AI16

Overvoltageprotection

The inputs of the analog input modules are protected against overvoltages and

transients with suppressor diodes and RC networks. See also chapter 6 for

environmental requirements.


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Siemens AG1-6

Multiplexer The AI32 analog input module is equipped with an electronic multiplexer. Thisconcept permits compact design so that 32 analog inputs can be wired on one

module.

In contrast, the AI16 analog input module is optimized for higher potential

isolation and interference immunity between the input circuits. It is equippedwith 16, 2-way relays, and each input circuit is switched through differentiall

up to the A/D converter.

A/D converter The A/D converter function unit is designed in accordance with the latestinterference-proof principle of the Sigma-Delta procedure. Filter times,

resolution and amplification can be parameterized. High-precision, low-drift

reference voltage sources permit self-calibration of the converter unit. With

interference suppression parameterized to 50 Hz, conversion time for one

measured value is approximately 30 msec.

AutomaticcalibrationEquipped with precise, low-drift reference voltage sources, the analog inputmodules calibrate themselves automatically. After switchon and at regular

intervals, the modules automatically perform a zero point and a full-scale

calibration to reduce temperature drift.

Programmableamplification

The programmable (parameterizable) preamplifier is a functional part of the A/D

converter. It permits adjustment of various input nominal ranges to the optimal

working range of the converter. This ensures highest conversion accuracy at all

times.

Monitoring

functions

After a voltage failure or a reset, the module boots in a defined state. Event

acquisition and generation of interrupts are disabled and must be specificallenabled via a system function of the CPU.

The module is equipped with the monitoring functions listed below.

Processor (watchdog function)

Memory test (runs continuously in the background)

Failure of the A/D converter

Failure of the reference voltage

Failure of the floating voltage supply of the analog portion

Transmission optocoupler

Overflow of the input areas

System busaddressing

System bus addressing is designed as an ASIC. It ensures coordinated accesses

to the system bus stations (e.g., the CPU and the local, 8-bit controller of the

analog input modules).

The system bus is designed as a parallel I/O bus. It is used to transfer all jobs

and data. In addition, a global control line is provided for synchronization of

time management on the modules.


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Siemens AG2-1

2 Setup and Connection

Setup and Connection 2Introduction SIMATIC S7-400 system construction combines modern functional design with

knowledge gained from operation in industrial environments. Universal use is

assured as well as interference-free operation of the analog input modules in a

wide variety of process environments.


This chapter provides you with information on the operator control,

construction and connection elements. This information will permit you to

specify connection of the process signals to the function module.

Contents of thischapter

This chapter covers the following topics.

A picture showing the primary construction elements

An explanation of the construction elements

The connection assignment for the AI32 and AI16

Descriptions of the installation and wiring of the modules

Possible causes of measured value distortions

Suggestions for connection of measured value encoders


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Setup and Connection


Siemens AG2-2

2.1 Construction Elements of the Analog Input Modules

The analog input modules are encapsulated function modules in SIMATIC S7-

400 industrial design and protected against touch.

Picture The picture below shows a view of the analog input modules and their primaryconstruction elements.

hb_

de_

bg

a

b

c

d

ef

m

i

O

kn

p

r

dh

g

BackBus connectori

Coding elementsO

Name platenFront door (swing-out)pCable connectionr

Front connector

Mounting screw forfront connector

m

Housing (choice of screw,crimp or spring connection)

k

Module caseaVentilation slitsb

Housing

Threads for front connectorcModule identifier andd

Oper. / diagnostic indicationseProcess indicationsfMultipoint terminal strip (48-way)gPosition for front connectorh

Front

mounting

Figure 2-1 View of the AI32/16 and its most important construction elements


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Siemens AG2-3

2.1.1 The Module

Housing A module capsule consisting of housing shell and cover protects the functionmodule against accidental touch. The module has a protection rating of IP20. It

also has ESD protection.

Warning

Do not remove the module capsule. Do not install or operate the AI32/16

function modules without the module capsule.

Bus plugconnectors

The AI32/16 module is equipped with two, 5-row, metric bus plug connectors

for operation in the SIMATIC S7-400 bus system.

Front All function elements required for installation, operation and service are locatedon the front of the module.

Slot for front plug connector

The slot for the 48-way plug connector is recessed. The front plug

connector can be hung in this recess, inserted and secured with a screw.

Two threaded bores are provided for securing the module to the module

rack.

Operational and diagnostic indications

Note

Front plug connector, name plate and coding elements are not included with the

analog input modules. They must be ordered separately. See

accessories/replacement parts in appendix 2.

Operational anddiagnosticindications

One green and two red LEDs are provided on the front of the housing capsule

for indication of operating states, and internal and external errors. The states

are described in chapter 5.1.


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Siemens AG2-4

2.1.2 Front Plug Connector

The front plug connector is available in 3 models.

Screw connection The connector is equipped with 48 connections spaced at 5-mm intervals.

2 connections have been allocated at the factory for connector monitoring.

For the AI32: 40 connections for process inputs and reference potential

(GND). For the AI16: Only 32 connections allocated for process inputs.

Eight screw-type terminals are free.

6 connections remain free.

See Figure 2-2 (AI32) and Figure 2-3 (AI16) for allocation of the front plug

connector.

The current carrying capacity of the contacts is a maximum of 8 A at an ambient

temperature of 70 C.

The connection element permits the connection of flexible lines with core cross

sections of 0.25 mm to 1.5 mm. The number of lines which will fit in the

cable retainer space depends on the diameter of the lines used. Some guidelinesare listed below.

36 lines with an exterior diameter of 3.0 mm (e.g., up to 1.5 mm)

46 lines with an exterior diameter of 2.5 mm (e.g., 1.0 mm)

The cable retainer space is equipped with a front door which can be removed

for installation work. A name plate is snapped onto the front door. The 32

process inputs for the AI32 ( I0 to I31 and8 connections for the root GND) or the32 process inputs for the AI16 ( I0P to I15P and I0N to I15N) can be entered onthis name plate.

Crimp connection The number and allocation of the contacts is the same as that of the model with

screw-type connections. The contacts with the crimp-type lines are insertedfrom the cable retainer space in the chambers of the front plug connector and

snapped in. If necessary, the contact can be unlocked and removed from the

front with an unlocking tool. See accessories and replacement parts in appendix

2.

The crimp-type contact permits the connection of flexible lines with core cross

sections of 0.5 mm to 1.5 mm. The number of lines which will fit in the cable

retainer space depends on the diameter of the lines used. The same guidelines

apply as for the screw-type connections.

Tension springterminal

The number and allocation of the contacts is the same as that of the model with

screw-type connections. The contact of the tension spring terminal is opened

with a suitable tool, and the wire is inserted. After the tool is removed, thecontact establishes the terminal connection.

The tension spring terminal permits the connection of flexible or rigid lines with

core cross sections of 0.14 mm to 1.5 mm. The number of lines which will fit

in the cable retainer space depends on the diameter of the lines used. The same

guidelines apply as for the screw-type connections.

Coding element A mixup of connection cables can be prevented by snapping in one codingelement each on the lower edge of the recess and on the front plug connector.

See the manual on setting up an S7-400 for use and possible coding.


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Siemens AG2-5

2.2 Connection Allocation

2.2.1 Allocation of the AI32

Connection

diagram

The following figure shows all connections of the AI32.

hb_

ai_ag

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+

-

12

28

34

5

6

7

8

910

11

12

13

1415

16

17

18

19

20

21

22

23

24

2526

27

29

30

3132

33

34

35

3637

38

39

40

41

4243

44

45

46

47

48

GND

GND

E0

E1

E2

E3

E4

E5

E6

E7

GND

GND

E8

E9

E10

E11

E12

E13

E14

E15

AI32

MW1

MW2

MW3

MW4

MW5

MW6

MW7

Potentialisolation

2.5 kV

Analog/digital

converter

MW8

Solid-state-

Pin no. of multipointterminal stripInput

GND

GND

E17

E18

E19

E20

E21

E22

E23

GND

GND

E25

E26

E27

E28

E29

E30

E31

E16

E24

MW9

MW10

MW11

MW12

MW13

MW14

MW15

MW16

MW17

MW18

MW19

MW20

MW21

MW22

MW23

MW24

MW25

MW26

MW27

MW28

MW29

MW30

MW31

MW0

Plug connectormonitoring(pull loop)

multiplexer

ZS1ZS2

Figure 2-2 Connection allocation of the AI32Abbreviations used:MWx Measured value source Ex Meas. value input

GND Common root


20/84



Siemens AG2-6

2.2.2 Allocation of the AI16

Connectiondiagram

The following figure shows all connections of the AI16

hb_

ar_ag

+

-

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

+-=

E15NE15P

E0PE0N

E1PE1N

E2PE2N

E3PE3N

E4PE4N

E5PE5N

E6PE6N

E7PE7N

E8PE8N

E9PE9N

E10P

E10N

E11PE11N

E12P

E12NE13PE13N

E14PE14N

1

2

28

345

67

89

1011

1213

141516

1718

1920

2122

23

24

252627

29

3031

3233

34

35

36

37

383940

4142

434445464748

AI16

Potentialisolation

2.5 kV

Analog/digital

converter

MW1

MW2

MW3

MW4

MW5

MW6

MW7

MW8

MW9

MW10

MW11

MW12

MW13

MW14

MW15

Relay

Input

MW0

Plug connectormonitoring(pull loop)

Pin no. of multipoint

terminal strip

multiplexer

ZS1ZS2

Figure 2-3 Connection allocation of the AI16Abbreviations used:MWx Measured value source Ex Meas. value input

GND Common root


21/84



Siemens AG2-7

2.3 Installation and Wiring

Installation The housing and location of the plug connector and mounting elements of the

analog modules are the same as those of the signal modules of the S7-400system.

Refer to the manual on setting up an S7-400 for information on the following

topics.

Adherence to the safety rules when working with the S7-400 syste

Unpacking and handling the modules

Installation and securing of the modules in the module rack

Connecting the wires in the front plug connector

Using the pull relief in the front plug connector

Mounting and securing the front plug connector on the module

Installing and removing the analog input modules is permitted under power.

Warning

Never wire the analog input modules unless they have first been isolated fro

the voltage.

Hazardous touch voltages can occur when measuring transformers are handled

improperly.

Wiring The modules are wired with single cores in the front plug connector. Theconnection technique and the line cross sections used vary with the type of front

plug connector used. See chapter 2.1.2.

Core sleeves are not required when flexible lines are used. If you use core

sleeves anyway, use only those without insulating collars (i.e., DIN 46228,

shape A, short version).

The single cores can also be connected as a cable to the front plug connector.

Note

The 2-core connection of the 32 inputs in the front plug connector of the AI32

(64 single cores) requires that the line cross section be reduced. Thegrounding lines of four measured values must be combined on one grounding

terminal.

Turning moment The connection screws in the front plug connector are tightened with a turningmoment of 60 to 80 Ncm. The maximum width of the screw driver blade used

to tighten the slotted screws is 4 mm.


22/84



Siemens AG2-8

Cabling with thetransfer module(example)

Transfer modules can be used to wire the systems, for example.

A prefabricated front plug connector with fitted cable (50 x 0.142) is used

for this type of cabling. This cable is connected to a transfer module for the

AI32/16.

hb_

ai_km

Figure 2-4 Example of cabling with the transfer module


23/84



Siemens AG2-9

2.4 Connection Technique for Prevention of Measured ValueDistortion

The system offers 2 versions of the analog input module.

The AI32 with 32 potentially isolated measuring inputs

The AI16 with 16 potentially isolated measuring inputs

The following information will help you select the right module. Important

criteria are listed below.

Accuracy desired

Environmental interference

Grounding conditions in the system

The measuring transformer used

2.4.1 Undesired Coupling of Current Circuits

The interference factors listed here are only intended as a general overview of

the most frequent sources of errors which can occur in actual practice.

For a detailed discussion of theoretical error analysis, see the extensive

selection of specialized literature available today.


24/84



Siemens AG2-10

Galvanic coupling Grounding loops are responsible for measured value distortions at differentpoints of a linked measuring circuit system. The figure below illustrates this

problem.

hb_

ai_pu

+

-

=

=

+

-

+

-

=

+

-

=

+ -H

+ -H

+ -H

AI32

UE2

UE1

CM0

UE0

CM1 CM2

GND

E31

E1

E2

E0

U U U

Analogportion

Digitalportion

Multi-plexer

UE = Measuring voltage

Potentialisolation

2.5 kV

1-of-32

UCM = Error voltage due to grounding loops

Figure 2-5 Measured value distortions caused by grounding loops

Measures used to avoid this problem:

Use separate supply and measuring signal lines.

Use star-shaped connections for the different current circuits (on the frontplug connector of the AI32/16 if possible).

Keep unavoidable coupling resistances low.

Avoid grounding loops.

Keep equipotential bonding in mind.

Capacitivecoupling

Long cable paths and cables in parallel paths (e.g., in cables with thin cores) are

responsible for measured value distortions caused by capacitive voltagecoupling. The figure below illustrates this problem.

hb_

ai_pv

+

-

=

=

+

-

+

-

=

+

-

=

AI 32

UE2

UE1

UE0

GND

E31

E1

E2

E0CK CK

CK AnalogportionDigitalportion

Multi-plexer


Potential

isolation2.5 kV

1-of-32CK = Coupling capacit

Figure 2-6Measured value distortions caused by capacitive voltage coupling


Keep line lengths short and signal frequencies low.

Provide greater distances between the different current circuits.

Use low-ohmic terminal resistors (voltage inputs more sensitive than currentinputs).

Use shielding.


25/84



Siemens AG2-11

Inductive coupling In addition to capacitive coupling, long cable paths and parallel cable paths alsocause measured values to be distorted by inductive current coupling. The figure

below illustrates this problem.

hb_

ai_pw

+

-

=

=

+

-

+

-

=

+

-

=

AI 32

UE2

UE1

UE0

GND

E31

E1

E2

E0MK

MKAnalogportion

Digitalportion

Multi-plexer


Potentialisolation

2.5 kV

1-of-32

MK = Coupling inductivity

Figure 2-7Measured value distortions caused by inductive current coupling


Keep line loops small. Twist feed and return conductors tightly together.

Provide large distances between different current circuits.

Select low signal frequencies.

Electromagneticcoupling

Electromagnetic fields are generated by industrial conditions (e.g., use of

powerful thyristor drives), environmental factors (e.g., lighting strikes) and

operational malfunctions (e.g., short circuits on overhead lines/grounding

cables). These factors cause the distortion of measured values in the measuring

lines. The figure below illustrates this problem.

hb_

ai_

px

+

-

=

=

+

-

+

-

=

+

-

=

A

A

A

AI 32

UE2

UE1

IE0

GND

E31

E1

E2

E0

UAnalogportion

Digitalportion

Multi-plexer


Potentialisolation

2.5 kV

1-of-32

U = Electromagneticallinduced

error voltage

Induction due toloop generation

Figure 2-8Measured value distortions caused by electromagnetic fields


Keep line loops small. Twist feed and return conductors tightly together.

Provide large distances between different current circuits.

Select low signal frequencies.

Provide shielding.


26/84



Siemens AG2-12

2.4.2 Shielding as a Method of Reducing Undesired InterferenceCoupling

Use of shielded cables between measured value encoders and analog input

modules reduces the effects of interference.Provide a good shield connection to ground potential (i.e., local ground). We

will now describe two possible methods of shielding. Keep the connection of

the shielding bar to the central grounding point (i.e., local ground) in the

switching cabinet short and provide sufficiently large line cross sections (i.e.,

2 6 mm2

).

Shielding withcable clamps

Figure 2-9 shows the shield connection of the shielded cable provided from the

system. The analog input modules are wired with the single cores of this cable.

hb_

ai_vs

GND

E0

E1E2

E3

PS CPU AI32

Cable from measured value encoder

Closed cabinet or housing

SIMATIC S7-400 frame

Local ground

Shield bar

( Cable retainer bar)

Cable

Shieldbar

Shielding

Cable clamp

As short a distance

as possible

Bus

Figure 2-9 Suggestion for shielding the measuring lines using wiring with

cable clamps


27/84



Siemens AG2-13

Shielding withintermediateterminals

Figure 2-10 shows how an effective shield connection can be made with series

intermediate terminals.

hb_

ai_vr

GND

E0

E1E2

E3

PS CPU AI32

Grounding terminalswith shield connection

via mounting rack

Cut shield braidingto < 3 cm

Cable from measured value encoders

Local ground

Mounting rack

SIMATIC S7-400 frame

Bus

Figure 2-10 Suggestion for shielding the measuring lines using series

intermediate terminals


28/84



Siemens AG2-14

2.4.3 Connection of Floating Measured Value Encoders

For AI32

hb_

ai_at

+

-

=

+

-

=

=

+

-

GND

E31

E0

E1

AI 32

Analogportion

Digitalportion

Multi-plexer

Signal encoder, floating

(Cable retainer bar)

Shield bar

Local ground

Potentialisolation

2.5 kV

1-of-32

U 250 Viso

UE0

UE1U =0Viso

S7systemb

u

Figure 2-11 Connection of floating measured value encoders to the AI32

For AI16

hb_

ar_at

+

-

=

+

-

=

=

+

- E1N

E1P

E0P

E0N

AI 16

E15P

E15N

Analogportion

Digitalportion

Multi-plexer

Signal encoder, floating

Local ground

U 125 Viso


Shield bar

Potentialisolation

2.5 kV

UE0

S7systemb

us

1-of-16

UE1

U 250 Viso

Figure 2-12 Connection of floating measured value encoders to the AI16

Note

Keep in mind the voltage immunity of the connection cable used.


29/84



Siemens AG2-15

2.4.4 Connection of Non-Floating Measured Value Encoders

For AI32

hb_

ai_ab

+

-

=

+

-

=

=

+

-

GND

E31

E0

E1

AI 32

Potentialisolation

2.5 kV

Analogportion

Digitalportion

Multi-plexer

Signal encoder, non-floating


Shield bar

Local ground

UE0

S7systemb

u

1-of-32

U 250 Viso

UE1

U =0 Viso

System

ground potential

Figure 2-13 Connection of non-floating measured value encoders to the AI32

For AI16

hb_

ar_ab

+

-

=

+

-

=

=

+

- E1N

E1P

E0P

E0N

AI 16

E15N

E15PPotentialisolation

2.5 kV

Analogportion

Digitalportion

Multi-plexer

1-of-16

Signal encoder, non-floating

Local ground(Cable retainer bar)

Shield bar

UE0

S7systemb

us

UE1

U 250 Viso

U 125 Viso

Systemground potential

Figure 2-14 Connection of non-floating measured value encoders to the AI16

Note

Common system ground potential cancels out the floating potential of the inputs.


30/84



Siemens AG2-16


31/84

SICAM Analog Input Modules AI32/16 - Manual Siemens AG

3-1

3 Functions of the Analog Input Modules

Functions of the Analog InputModules 3Introduction The AI32/16 analog input modules are microprocessor-controlled function

modules from the SIMATIC S7-400 system. They are used to acquire and

condition analog process signals.

Preliminary processing includes functions which meet the requirements of

telecontrol technology.


This chapter covers the representation and processing of analog values. This

information will give you a functional understanding of the analog input

modules and their parameterization.


This chapter contains information on the following topics.

The process image of the inputs (PAE)

Expanded image management in the event buffer (EPE)

The operating modes of measured value acquisition

Threshold value processing

Representation of the analog value in the process image

Measurement of current and voltage values


32/84

Functions of the Analog Input Modules


3-2

3.1 Processing Principle

The AI32/16 analog input module uses two different methods to process the

acquired measured value changes in parallel.

The difference between these two methods lies in the time at which processing

takes place (i.e., cyclic/spontaneous) and how the data is transferred to the CPU

(i.e., via process image/event buffer).

The PAE is always cyclically updated regardless of the utilization of other

functions.

The following figure shows the relationship between functions and processing

principle.

hb_

ae_

fl

00 1 0 0 01 1

01

11

00 0 0 01 10

Status acquisition

Event

buffer

Cyclic

Spontaneous

Processing Function Data transmission

Threshold valueprocessing

Processimage

Figure 3-1 Relationship between function and processing


33/84



3-3

3.1.1 Process Image

The process image of the inputs (PAE) contains the current raw measured

values of all activated analog inputs.

In the process image of the inputs, each input from I0 to I31 or I15 is assigned one

word of memory. The required memory area (i.e., 64 bytes) is located in the user

data area of the analog input module where it can be addressed directly by the CPU

and read with I/O accesses within a user program.

Status acquisition This function cyclically enters the raw measured values read in the processimage of the inputs. Cyclic updating of the process image of the inputs is always

performed regardless of the other functions used.

The following figure shows a flow chart of this function.

hb_

ai_fz

00 1 0 0 01 1

01

11

00 0 0 01 10

Data

Data

Cyclicprocessing

Spontaneousproce

ssing

Controller

Process interrupt

Measuring values

Filtering, interference suppression, evaluation

1-msec time stamp

S7 system bus

CPU

Data


EventbufferProcess

image

Controljobs

Continuous cyclic conversion of allactive measuring value inputs

Figure 3-2 Flow chart of cyclic processing


34/84



3-4

3.1.2 Event Buffer

The event buffer (EPE) contains the raw measured values acquired by the

spontaneous threshold value processing function, and supplementar

information.

The function collects the measured values into data blocks and enters them in

the event buffer at 1-msec intervals in the order in which they occurred. The

layout of these data records is described in chapter 4.2.3. The event buffer can

contain 100 events.

The AI32/16 module uses a process interrupt (PRAL) to cause the CPU to fetch

the data waiting in the event buffer (EPE). A system function call (SFC) is used

to read the event buffer.

The following figure shows a flow chart of the spontaneous processing function.

The process image of the inputs is also updated parallel to this.

hb_

ai_fs

00 1 0 0 01 1

01

11

00 0 0 01 10

Data

Data

Cyclicprocessing

Spontaneousproces

sing

Controller

Process interrupt

1-msec time stamp

S7 system bus

CPU

Data


Event

bufferProcessimage

Controljobs

Measuring values

Filtering, interference suppression, evaluation

Continuous cyclic conversion of allactive measuring value inputs

Figure 3-3 Flow chart of spontaneous processing


35/84



3-5

3.2 Measured Value Acquisition

The analog process signals on the inputs are called measured values.

The measured values are selected sequentially via the multiplexer, converted andwritten to the process image (PAE). The measured values can be converted

continuously (asynchronous) or started at specified times (synchronous).

If parameterized, the measured values can also be entered in the event buffer

together with supplementary information when a threshold is exceeded. See

section on threshold value processing below. The measured values are entered

in the event buffer at 1-msec intervals in the order in which they occurred.

Threshold valueprocessing

Before the measured values are made available in the event buffer, the AI32/16

module has already processed the measured values in accordance with threshold

value criteria. See Figure 3-4.

During the additive threshold value processing, the measured value entered lastin the event buffer remains stored as the "old value".

Each "new value" created when the measuring signal is converted is compared

with the "old value" stored. Differences from the "old value" are added in the

addition memory with the correct sign. If the amount in the addition memor

exceeds the parameterized threshold value, an event is generated with time

stamp and entered in the event buffer. This value is then stored as the new "old

value", and the addition memory is set to "0".

Even small but long-lasting changes in the measuring signal will cause an entr

in the event buffer after the parameterized number of conversions has been

exceeded.

hb_

ai_fi

Meas. value prog.

Meas. value (absol.)

"Old value"

Threshold value set

Time ofevent generationMeas. valueentered in EPE

Contents ofaddition memory

Diff. from"old value"

Grid ofscan times

t

+

-

1.0

0

0.0 0.0 0.0 0.5 0.2

1.0

2.0

3.0

1.0

0.0 -0.8 -0.4 0.0 0.6 1.4 1.8 2.2 2.6 2.9 1.2 0.4 0.3 0.1 0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.5

0.5

0.0

0.0

0.5

0.0

-0.8

-0.3

0.0 0.0 0.0 0.0

-0.4 0.0 1.00.2 0.6

-0.7 -0.7-0.5 0.1 1.1 0.4

1.0

0.4

1.0

0.8

1.2

0.0 1.0 1.8

0.0 1.8

0.4 0.8

1.8

0.4 1.2 0.3

2.6

0.3

2.6

-1.4

-1.1

2.6 1.2

1.2

-0.8

-0.8

1.2

-0.9

-1.7

-0.2

-0.2

0.0

-0.3

0.3

0.3 0.3 0.3

-0.3

0.0

0.3

-0.3

-0.5 -0.8 -1.1

0.0

Figure 3-4 Principle of the additive threshold value function

Synchronousmeasured valueprocessing

With synchronous measured value processing, encoding is started at specified

(absolute) times (synchronous). This permits the respective first measured value

of several AI modules to be recorded simultaneously at the set time (measured

value snapshot).

When the threshold is parameterized as "0," the measured values are transferred

spontaneously regardless of a change. Remember this may overload the system.


36/84



3-6

3.3 Description of Analog Value Representation

3.3.1 Analog Value Representation in the Process Image of the Inputs

(PA

Analog input modules convert the analog process signal into a digital format.

The AI32 and AI16 modules represent the digitized analog value the same for

the same input and measuring range.

Left-justified, fixed point numbers in dual complement are used for

representation in the process image of the inputs. The 3 least significant bit

numbers contain the status bits OV, IV and NT.

The following table shows analog value representation by the AI32/16 in the

process image of the inputs.

Table 3-1 Analog value representation in the process image of the inputs

Analog ValueHigh Byte Low Byte

Bit number 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Significance of the

bits

VZ 211 210 29 28 27 26 25 24 23 22 21 20 NT IV OV

Abbreviations used:

OV : "Overflow" status bit

IV : "Invalid" status bitNT : "Not topic" status bit (i.e., invalid)

VZ : Sign

Status bits The status bits of the analog value are always located in bits 0 to 2.

* OV = "1 Means the measured value is in the overflow area.

* IV = "1" Means that the AI32/16 has detected an error applicable to

this measured value.

* NT = "1" Means that the measured value in invalid (i.e., is not activated

and will not be updated).

Sign The sign of the analog value is always located in bit 15.

* VZ = "0" Means + (i.e., positive).

* VZ = "1" Means - (i.e., negative). The measured value is represented in

dual complement. See Table 3-3.


37/84



3-7

3.3.2 Analog Value Representation in the Event Buffer (EPE)

Entries in the event buffer triggered spontaneously by threshold value

processing are made in the format used by the TP1 communications processor

for telecontrol telegrams.

The AI32 and AI16 use the same representation for the same input and measuring

range.

Left-justified, fixed point numbers in dual complement are used for

representation in the event buffer. The most significant bit contains the sign. A

status byte contains the status information. See chapter 4.2.3 for the transfer

format of the data record.

The following table shows the analog value representation used by the AI32/16

modules in the event buffer.

Table 3-2 Analog value representation in the event buffer

Analog ValueHigh Byte Low Byte

Bit number 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Significance of the

bitsVZ 211 210 29 28 27 26 25 24 23 22 21 20 0 0 0

Abbreviations used:

VZ : Sign


38/84



3-8

Measured valueresolution(Representation inthe process imageof the inputs)

The resolution of the analog values is not dependent on the input and measuring

range parameterized.

Table 3-3 lists the binary, decimal and hexadecimal representation of the

measured value resolution.

Table 3-3 Representation of the measured value resolution

Range Units Analog Value

% Decimal Hexadec. High Byte Low Byte

215 214 213 212 211 210 29 28 27 26 25 24 23 22 21 20

120 32760 7FF8H 0 1 1 1 1 1 1 1 1 1 1 1 1 0 0 OV

Overflow * : : : :

119.03 32496 7EF0H 0 1 1 1 1 1 1 0 1 1 1 1 0 0 0 OV

Over- 119 32488 7EE8H 0 1 1 1 1 1 1 0 1 1 1 0 1 0 0 0load : : : :

area 100.03 27312 6AB0H 0 1 1 0 1 0 1 0 1 0 1 1 0 0 0 0

100 27304 6AA8H 0 1 1 0 1 0 1 0 1 0 1 0 1 0 0 0

: : : :

75 20472 4FF8H 0 1 0 0 1 1 1 1 1 1 1 1 1 0 0 0

: : : :

50 13648 3550H 0 0 1 1 0 1 0 1 0 1 0 1 0 0 0 0

: : : :

0.12 32 0020H 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0

0.09 24 0018H 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0

0.06 16 0010H 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0

Nom. range 0.03 8 0008H 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0

0 0 0000H 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

-0.03 -8 FFF8H 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0

-0.06 -16 FFF0H 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0

: : : :

-75 -20472 B008H 1 0 1 1 0 0 0 0 0 0 0 0 1 0 0 0

: : : :

-100 -27304 9558H 1 0 0 1 0 1 0 1 0 1 0 1 1 0 0 0

Over- -100.03 -27312 9550H 1 0 0 1 0 1 0 1 0 1 0 1 0 0 0 0load : : : :area -119 -32496 8110H 1 0 0 0 0 0 0 1 0 0 0 1 0 0 0 0

-119.03 -32504 8108H 1 0 0 0 0 0 0 1 0 0 0 0 1 0 0 OV

Overflow * : : : :

-120 -32768 8000H 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 OV

* When a measured value is in this range, bit 20 ("OV") is set and the AI32/16 modulereports the "overflow" error. See chapter 5.3.2.


39/84



3-9

Assignment of themeasuring ranges

Tables 3-4 to 3-6 contain the digitized analog values for the various measuring

ranges of the AI32/16 module.

Since the binary representation of the analog values is always the same and

these have already been listed in Table 3-3, these tables only contain the

measuring ranges and the units.

Input rangeCurrent 24 mand voltage 6 V

Table 3-4 Resolution of the measuring ranges for input range of current

24 mA and voltage 6 V

Measuring Range

Range Units 1.5 mA 3 mA 6 mA 12 mA 24 mA

% Decimal Hexadec. 1.5 V 3 V 6 V

120 32760 7FF8H 1.8 3.599 7.198 14.397 28.794

Overflow : : : : : : :119.03 32496 7EF0H 1.7844 3.570 7.141 14.280 28.562

Over- 119 32488 7EE8H 1.784 3.569 7.139 14.277 28.555load : : . : : : :area 100.03 27312 6AB0H 1.5004 3.0009 6.0017 12.003 24.007

100 27304 6AA8H 1.5 3 6 12 24

: : : : : : :

75 20472 4FF8H 1.125 2.25 4.5 9 18

: : : : : : :

50 13648 3550H 0.75 1.5 3 6 12

: : : : : : :

0.12 32 0020H 0.0017 0.0035 0.0069 0.014 0.028

0.09 24 0018H 0.0013 0.0026 0.0052 0.010 0.021

0.06 16 0010H 0.0009 0.0017 0.0035 0.007 0.014

0.03 8 0008H 0.0004 0.0009 0.0017 0.003 0.007

Nom. range 0 0 0000H 0 0 0 0 0

-0.03 -8 FFF8H -0.0004 -0.0009 -0.0017 -0.003 -0.007

-0.06 -16 FFF0H -0.0009 -0.0017 -0.0035 -0.007 -0.014

: : : : : : : :

-75 -20472 B008H -1.125 -2.25 -4.5 -9 -18

: : : : : : :

-100 -27304 9558H -1.5 -3 -6 -12 -24

Over- -100.03 -27312 9550H -1.5004 -3.0009 -6.0017 -12.003 -24.007load : : : : : : :

area -119 -32496 8110H -1.784 -3.569 -7.139 -14.277 -28.555

-119.03 -32504 8108H -1.7844 -3.570 -7.141 -14.280 -28.562

Overflow : : : : : : :

-120 -32768 8000H -1.8 -3.599 -7.198 -14.397 -28.794


40/84



3-10

Input rangeCurrent 20 mand voltage 10 V

Table 3-5 Resolution of the measuring ranges for input area of current

20 mA/4 to 20 mA and voltage 10 V

Measuring Range

Range/ Units 2.5 mA 5 mA 10 mA 20 mA 4 - 20 mA

% Decimal Hexadec. 1.25 V 2.5 V 5 V 10 V

120 32760 7FF8H 1.5 2.999 5.998 11.997 23.994 23.195

Overflow: :

: : : : : :

119.03 32496 7EF0H 1.488 2.975 5.950 11.901 23.802 23.042

Over- 119 32488 7EE8H 1.487 2.974 5.949 11.898 23.796 23.038load : : : : : : : :area 100.03 27312 6AB0H 1.2504 2.5007 5.0015 10.003 20.006 20.005

100 27304 6AA8H 1.25 2.5 5 10 20 20

: : : : : : : :

75 20472 4FF8H 0.9375 1.875 3.75 7.5 15 16

: : : : : : : :

50 13648 3550H 0.625 1.25 2.5 5 10 12

: : : : : : :

0.12 32 0020H 0.0015 0.0029 0.0058 0.012 0.023 4.019

0.09 24 0018H 0.0011 0.0022 0.0043 0.009 0.017 4.014

0.06 16 0010H 0.0007 0.0015 0.0029 0.006 0.012 4.009

0.03 8 0008H 0.0004 0.0007 0.0015 0.003 0.006 4.005

Nom. range 0 0 0000H 0 0 0 0 0 4

-0.03 -8 FFF8H -0.0004 -0.0007 -0.0015 -0.003 -0.006 3.995

-0.06 -16 FFF0H -0.0007 -0.0015 -0.0029 -0.006 -0.012 3.991

: : : : : : : :

-25 -6824 E558H -0.3125 -0.625 -1.25 -2.5 -5 0

: : : : : : : :

-75 -20472 B008H -0.9375 -1.875 -3.75 -7.5 -15

: : : : : : :

-100 -27304 9558H -1.25 -2.5 -5 -10 -20

Over- -100.03 -27312 9550H -1.2504 -2.501 -5.0015 -10.003 -20.006load : : : : : : :

area -119 -32496 8110H -1.487 -2.974 -5.949 -11.898 -23.796

-119.03 -32504 8108H -1.488 -2.975 -5.950 -11.901 -23.802

Overflow : : : : : : :

-120 -32768 8000H -1.5 -2.999 -5.998 -11.997 -23.994

Disregard


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3-11

Input rangeCurrent 1 mAand voltage 1 V

Table 3-6 Resolution of the measuring ranges for input range of current

1 mA and voltage 1 V

Measuring Range

Range/ Units 0.5 mA 1 mA

% Decimal Hexadec. 0.5 V 1 V

120 32760 7FF8H 0.5999 1.1997

Overflow: :

: :

119.03 32496 7EF0H 0.5950 1.1901

Over- 119 32488 7EE8H 0.5949 1.1898load : : : :area 100.04 27312 6AB0H 0.5001 1.0003

100 27304 6AA8H 0.5 1

: : : :

75 20472 4FF8H 0.375 0.75

: : : :

50 13648 3550H 0.25 0.5

: : : :

0.12 32 0020H 0.0006 0.0012

0.09 24 0018H 0.0004 0.0009

0.06 16 0010H 0.0003 0.0006

0.03 8 0008H 0.0001 0.0003

Nom. range 0 0 0000H 0 0

-0.03 -8 FFF8H -0.0001 -0.0003

-0.06 -16 FFF0H -0.0003 -0.0006

: : : : :

-75 -20472 B008H -0.375 -0.75

: : : :

-100 -27304 9558H -0.5 -1

Over- -100.03 -27312 9550H -0.5001 -1.0003load : : : :

area -119 -32496 8110H -0.5949 -1.1898

-119.03 -32504 8108H -0.5950 -1.1901

Overflow : : : :

-120 -32768 8000H -0.5999 -1.1997


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3-12

3.4 Current or Voltage Input

Input resistance AI32/16 analog input modules are available with either current or voltageinputs. Voltage inputs are high ohmic. Current inputs have measuring resistorsfor high accurac . Due to the low ohmic measuring circuit termination, current

inputs are not as sensitive to interference and should be used if possible.

Selection of the inputs of the analog input modules has nothing to do with the actual

measured variable. Conversion is handled by a measuring transducer installed in

between. See Figure 3-5.

hb_

ar_ai

+

-

1

2

+

-

1

2

Converter Fronconnector

Analog input AI 16with current inputs

N L

K

L

k

Measuringtransducer

Process Cabinet

N L

U

V

u

v

UH

-+

UH

-+

AE

AE

Measured quantity U

+

-

=

Potentialisolation

2.5 kV

Multiplexer

1-of-16

E1N

E1P

E15N

E15P

E0P

E0N

Analogportion

MW0I

MW1I

O

Measured quantity I

Figure 3-5 Connection of measuring converters on current inputs

Input range /measuring range

Several related measuring ranges are combined into one input range. A special

reference voltage is fed to each input range to optimize measuring accuracy.

Measuring ranges from different input ranges cannot be parameterized on one

module because the required recalibration would increase coding time

considerably


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3-13

3.5 Overlapping Function

An overlapping function is implemented on the AI32/16 module which is

available during cyclic and spontaneous processing.

Zero pointsuppression

Every measured value is subjected to a parameterizable zero point suppression.

For more information, see the menu tree in chapter Fehler! Verweisquelle

konnte nicht gefunden werden.. Zero point suppression is used to stabilize the

converted value when it approaches zero. The lower value range which can be

parameterized in percentages is specifically set to zero.

Wire break The AI32/16 module with current inputs has a measuring range of 4 to 20 mA.The inputs which are parameterized with this measuring range permit wire break

monitoring in the measuring circuit.

The measured value encoders used here already supply a current of 4 mA for themeasured value 0 mA. The AI32/16 module calculates this offset value and then

enters the measured value of 0 mA in the data record. See Table 3-5.

When the current drops below 3.8mA, the AI32/16 module recognizes "wire

break" and reports this with an entry in the event buffer (see chapter 5.3.1) and

with additional diagnostic data in data record 1 (see chapter 5-11).


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3-14


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Siemens AG4-1

4 Operation and Use

Operation and Use 4Introduction Before data communication can take place with the analog input modules, the

must be configured in the SIMATIC S7 system and parameterized if necessary.

Communication of the AI32/16 modules with the CPU is handled by the

SIMATIC S7 system bus.


This chapter provides you with information on parameterization of the modules

and linking them to applications. Examples are provided to illustrate this

information. Data communication with the analog input modules is described.


This chapter contains information on the following topics.

Linking the AI32/16 modules to a SIMATIC project

Data assignment in the process image of the inputs (PAE)

Data assignment in the event buffer (EPE)

Control jobs (e.g., synchronization of the time)


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Operation and Use


4-2

4.1 Configuring and Parameterizing

To configure the AI32/16 in a SIMATIC S7-400 system and provide it with

parameters, use the hardware configuration of the SIMATIC Manager. You canperform the following with HW Konfig.

Arrange the modules in a configuration table based on the planned setup

Specify the parameters for the modules

Generate system data blocks (SDB) containing the specified parameters

Transfer system data blocks to a CPU or read them from a CPU

Print out the configuration and parameters

See the manual on using the tools with STEP7 for detailed information on ho

to proceed and the scope of tools available.

Note

The "SICAM plusTOOLS for RTU (HW Konfig)" must be installed so that the

AI32/16 can be added to the module catalog in HW Konfig.

This tool is not included with the AI32/16 and must be ordered separately. See

"Accessories and Replacement Parts" on page Appendix-2.

Configuring The term "configuring" means the arrangement of modules in a configurationtable. The allocation of the module rack slots is specified here. The S7 configuration

tool automatically assigns an address to every analog input module in this table.

This address cut be modify on every time.

The following figure shows the menu window of the S7 Configuration tool inwhich AI32/16 assignment is performed.

Figure 4-1 Menu window for the configuration

After an AI32/16 module has been entered in the menu shown in Figure 4-1,

you can double click inthe menu line to open the window shown in Figure 4-2for parameterization of the AI32/16 module.


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Operation and Use


Siemens AG4-3

Parameterizing The term "parameterizing" means the setting of parameters for the digital inputmodule. This adapts the hardware and firmware to the specific functions.

Default parameters After the supply voltage is turned on and the system has booted, the AI32/16 is

in the following state. Cyclic status acquisition (only updating of the PAE process image).

All inputs are active.

Greatest input and measuring range: 24 mA or 10 V

Interference voltage suppression: 50 Hz

No zero point suppression

No spontaneous event generation (i.e., threshold value processing disabled)

Generalparameters

The two menu windows below are used to enter non-standard module

addressing and interrupt processing. In addition, a commentary can be assigned

to the AI32/16 module.

Figure 4-2 Menu window for general parameters

Figure 4-3 Menu window for the logical addressing of the AI32/16 module


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Operation and Use


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Basic parameters The following figure shows the menu window in which the basic parameters ofthe AI32/16 module are specified.

Figure 4-4 Menu window for entry of the basic parameters

Parameters formeasured valuechannels

The following figure shows the menu window in which the channel-related

parameters are entered.

Figure 4-5 Menu window for channel-related parameters

Menu tree The menu tree for parameterization is structured hierarchically as shown inFigure 4-6 and Figure 4-7. One hierarchical level contains all branches of that

level.

The menu items of one level are used to set the parameters related to this level.

These parameters are valid for all subordinate hierarchical levels of this

particular menu item.


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Operation and Use


Siemens AG4-5

Menu Tree for Parameterization of theAI32/16with Current Inputs

hb_ai_m1

AI32

Interference suppression

Input area

Input currents

Measuring areas (for input area 24mA)

Input active (yes / no)

Event generation (yes / no)

Frequency (50Hz / 60 Hz / 16/Hz)

Current value (24mA / 20mA / 1mA)

Menu start (see figure 4-2)

Valid for all inputs

AI

16withcurrent

Input

Zero point suppression(0=off, 1 to 128 in steps of 0.1%)

(+1,5 / 1,5 / +3 / 3 / +6 / 6 / + 12 / 12 / +24 / 24mA)

Input voltages


(+2,5 / 2,5 / +5 / 5 / +10 / 10 / +20 / 20 / +4 - +20 mA)

Input voltages


(+0.5 / 0.5 / +1 / 1mA)

Threshold value(0=off, 1 to 128 in steps of 0.1%)


Yes: Data transfer to PAEThe number of activated inputsdirectly influences the updatingtime of the measured value.

Different measuring ranges

can be parameterizedwithin a module.The shortest measured valueupdating time results for onlyone measuring range.

Data transfer: EPEinterrupt-controlled with time

inputs

Percentage of raw value.

Menu tree Remarks

Can be selected for everysingle current input

Seconds value for start of encoding

Start time of encoding

Figure 4-6 Menu tree for AI32/16 with current inputs


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Operation and Use


Siemens AG4-6

Menu Tree for Parameterization of theAI32/16with Voltage Inputs

hb_ai_m2

AI32

Interference suppression

Input area

Input voltages

Measuring areas (for input area 10V)

Input active (yes / no)

Event generation (yes / no)

Frequency (1 to 100 Hz in steps of one and 16/Hz)

Voltage value (10V / 6V / 1V)

Menu start (see figure 4-2)


AI

16withvoltage

Input

Zero point suppression(0.0 to 128.7% in steps of 0.1%)

(+1.25 / 1.25 / +2.5 / 2.5 / +5 / 5 / +10 / 10 V)

Input voltages


(+1.5 / 1.5 / +3 / 3 / +6 / 6 V)

Input voltages


(+0.5 / 0.5 / +1 / 1V)

Threshold value(0.0 to 12.7% in steps of 0.1%)


Yes: Data transfer to PAEThe number of activated inputsdirectly influences the updatingtime of the measured value.

Different measuring rangescan be parameterizedwithin a module.The shortest measured valueupdating time results for onlyone measuring range.

Data transfer: EPEinterrupt-controlled with time

inputs

Percentage of raw value.

Menu tree Remarks

Can be selected for everysingle voltage input

Start time of encoding

Seconds value for start of encoding

Figure 4-7 Menu tree for AI32/16 module with voltage inputs


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Operation and Use


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4.2 Data of the AI32/16

4.2.1 Reading Out the Process Image of the Inputs (PAE)

The analog input modules keep the measured values of all 32 or 16 analog

inputs in the process image of the inputs. The values are arranged in ascending

order.

The process image of the inputs of the analog input modules is located in the

user data area of the I/O which can be addressed directly. The CPU can read

out the measured values during each freely programmable user cycle.

The address is based on the slots and is specified when the system is configured.

Assignment of the process image:

Address ( analog input n ) Basic address + 2 Fn

Example:

Address ( analog input 3 ) Basic address + 6

4.2.2 Reading Out the Event Buffer (EPE)

The data records of the changes in measured values detected by threshold

processing are stored intermediately in the event buffer.

A data entry in the event buffer contains the measured value with sign, the

status bits and the time with a resolution of 1 msec. If several data records have

been entered in the event buffer before it is read out, the AI32/16 module

combines these recordsinto a data block. See chapter 4.2.3 for a description of

the transfer format. The event buffer works on the first-in-first-out principle.

The buffer can hold up to 100 events. A buffer overflow is identified by a data

record in the event buffer. See chapter 5.3.2 for more information on buffer

overflows.

Reading outprocess data

The AI32/16 analog input modules trigger a process interrupt (PRAL) to the

CPU as soon as data entries are made in the event buffer. The related data

record, which may contain several entries depending on the number of process

changes, is then ready to be fetched by the CPU.

The process interrupt triggers an interrupt routine on the CPU. The syste

determines which module has triggered the interrupt. The data record can then

be read from the module with a system function call (SFC59) and stored

intermediately in a data block (DB). After the AI32/16 module recognizes that

the data record reported by the process interrupt has been read, it is ready to

generate additional process interrupts again.

Note

Selecting a very low threshold value (e.g., 0.1%) causes measured values to be

entered very frequently in the event buffer. The module also generates process

interrupts very frequently.


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Operation and Use


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Additionalinformation withthe processinterrupt

The AI32/16 module provides additional information within the start information

block to the interrupt OB.

Table 4-1 shows the layout of the section of the start information block (local

data of alarm OB) applicable to this addi

Documents

Sicam_AI32 16 Module