Siemens SIMATIC FM 450-1 User manual

Preface, Contents
User Information
Product Overview 1
How the FM 450-1 Counts 2
Installing and Removing the
FM 450-1 3
Wiring the FM 450-1 4
Assigning Parameters to the
FM 450-1 5
Programming the FM 450-1 6
Programming in M7 with the
Counter Function Library 7
Starting Up the FM 450-1 8
Reference Information
Operating Modes, Settings,
Parameters and Commands 9
Encoder Signals and Their
Evaluation 10
DB Assignments 11
M7 Reference
Counter Function Library 12
Faults and Diagnostics 13
Appendices
Technical Specifications A
Spare Parts B
References C
Glossary, Index
C79000-G7076-C450-01
FM 450-1 Counter Function
Module
Installation and Parameter
Assignment
Manual
SIMATIC
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ii FM 450-1 Counter Function Module
C79000 G7076 C450 01
This manual contains notices which you should observe to ensure your own personal safety, as well asto
protect the product and connected equipment. These notices are highlighted in the manual by a warning
triangle and are marked as follows according to the level of danger:
!Danger
indicatesthatdeath,severepersonalinjuryorsubstantialpropertydamagewillresultifproperprecautionsare
not taken.
!Warning
indicatesthatdeath,severepersonalinjuryorsubstantialpropertydamagecanresultifproperprecautionsare
not taken.
!Caution
indicates that minor personal injury or property damage can result if proper precautions are not taken.
Note
drawsyourattentiontoparticularlyimportantinformationontheproduct,handlingtheproduct,ortoaparticular
part of the documentation.
The device/system may only be set up and operated in conjunction with this manual.
Only qualified personnel should be allowed to install and work on this equipment. Qualified persons are
defined as persons who are authorized to commission, to ground, and to tag circuits, equipment, and sys-
tems in accordance with established safety practices and standards.
Note the following:
!Warning
Thisdeviceanditscomponentsmayonlybeusedfortheapplicationsdescribedinthecatalogorthetechnical
description, and onlyinconnectionwith devicesor components fromother manufacturers whichhave been
approved or recommended by Siemens.
Thisproductcanonlyfunctioncorrectlyandsafelyifitistransported,stored,setup,andinstalledcorrectly,and
operated and maintained as recommended.
SIMATICRand SINECRare registered trademarks of SIEMENS AG.
Third parties using for their own purposes any other names in this document which refer to
trademarks might infringe upon the rights of the trademark owners.
We have checked the contents of this manual for agreement with the
hardwareandsoftwaredescribed.Sincedeviationscannotbeprecluded
entirely, we cannot guarantee full agreement. However, the data in this
manualarereviewedregularlyandanynecessarycorrectionsincludedin
subsequent editions. Suggestions for improvement are welcomed.
ESiemens AG 1996
Technical data subject to change.
Disclaimer of LiabilityCopyright ESiemens AG 1996 All rights reserved
Thereproduction,transmissionoruseofthisdocumentoritscontentsis
notpermittedwithoutexpresswrittenauthority.Offenderswillbeliablefor
damages.Allrights,includingrightscreatedbypatentgrantorregistration
of a utility model or design, are reserved.
Siemens AG
AutomationGroup
IndustrialAutomation Systems
Postfach4848, D-90327Nürnberg
Siemens Aktiengesellschaft Order No. C79000-G7076-C450
Safety Guidelines
Qualified Personnel
Correct Usage
Trademarks
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iii
FM 450-1 Counter Function Module
C79000-G7076-C450-01
Preface
This manual describes all the steps required for using the FM 450-1 function
module effectively. It supports you in learning the functionality of the
FM 450-1 quickly and effectively.
This manual describes the hardware and software of the FM 450-1. It consists
of an instructional section and a reference section (appendices).
The manual contains the following:
SBasics of counting
SInstallation and expansion of the FM 450-1
SWiring the FM 450-1
SAssigning parameters to the FM 450-1
SProgramming the FM 450-1
SAppendices
The manual is aimed at the following audience:
SInstallation engineers
SProgrammers
SStartup engineers
SService and maintenance personnel
This manual contains the description of the FM 450-1 function module valid
at the time of publication of the manual. We reserve the right to describe any
subsequent changes in the functionality of the FM 450-1 in a Product
Information.
You will find a list of other references on the topic of the S7-400 and pro-
grammable controllers in the appendix.
Purpose
Contents of This
Manual
Audience
Scope of This
Manual
Other References
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iv FM 450-1 Counter Function Module
C79000-G7076-C450-01
To make it easier for you to locate specific information, the manual has been
structured as follows:
SAt the beginning of the manual, you will find a complete table of contents
and a list of all the figures and tables contained in the manual.
SIn the individual chapters, the information in left margin gives an over-
view of the contents of each section.
SFollowing the appendices, there is a glossary containing definitions of the
important technical terms used in the manual.
SAt the end of the manual, you will find a detailed index giving you fast
access to the information you seek.
The S7-400/M7-400 programmable controller conforms to the IEC 1131 stan-
dard.
If the manual fails to answer any questions concerning products described in
the manual please contact your Siemens representative at your local Siemens
office. You will find the relevant addresses in the ‘SIEMENS Worldwide’
Appendix of the ‘S7-400 and M7-400 Programmable Controllers’ manual.
If you have any questions or remarks regarding the manual itself, please fill
in the reply sheet at the back of the manual and send it to the address given.
Please also indicate your personal evaluation of the manual in the remarks
form.
We offer courses for entry-level users of the SIMATIC automation system.
Please contact your local training center or the Central Training Center in
D-90327 Nuremberg, Tel. ++49 911/895 3154.
Structure of This
Manual
Standards
Additional
Assistance
Preface
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v
FM 450-1 Counter Function Module
C79000-G7076-C450-01
Contents
Preface v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Product Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 What Can the FM 450-1 Do? 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Application Areas of the FM 450-1 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 FM 450-1 Hardware 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4 FM 450-1 Software 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 How the FM 450-1 Counts 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Definitions 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Gate Functions 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Installing and Removing the FM 450-1 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Preparing the Installation 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Installing and Removing the FM 450-1 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Wiring the FM 450-1 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Terminal Assignments of the Front Connector 4-2. . . . . . . . . . . . . . . . . . . . . . . .
4.2 Wiring the Front Connector 4-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Module Status After Switching On 4-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Assigning Parameters to the FM 450-1 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1 Installing and Calling Parameter Assignment Screen Forms 5-2. . . . . . . . . . .
6 Programming the FM 450-1 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1 The FC CNT_CTRL Function 6-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2 The FC DIAG_INF Function 6-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3 Application Example 6-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.4 Technical Specifications of the Blocks 6-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 Programming in M7 with the Counter Function Library 7-1. . . . . . . . . . . . . . . . . . . . .
7.1 Overview 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.2 Basic Program Structure 7-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.3 Initializing and Parameterizing the Counter Channel 7-5. . . . . . . . . . . . . . . . . .
7.4 Transferring the Load Value and Comparison Values 7-7. . . . . . . . . . . . . . . . .
7.5 Control of the Digital Inputs and Outputs 7-8. . . . . . . . . . . . . . . . . . . . . . . . . . . .
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vi FM 450-1 Counter Function Module
C79000-G7076-C450-01
7.6 Starting and Stopping the Counter Channel 7-9. . . . . . . . . . . . . . . . . . . . . . . . .
7.7 Reading the Counter Value and the Load Value, Scanning and
Resetting the Status 7-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.8 Processing Interrupts 7-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.9 Processing Error Messages 7-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 Starting Up the FM 450-1 8-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1 Mechanical Installation Checklist 8-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2 Parameter Assignment Checklist 8-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9 Operating Modes, Settings, Parameters and Commands 9-1. . . . . . . . . . . . . . . . . . .
9.1 Definitions 9-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.2 Basic Information on Calling Operating Modes, Settings and Commands 9-4
9.3 Continuous Counting 9-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.4 Single Counting 9-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.5 Periodic Counting 9-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.6 Setting: Counting Mode 9-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.7 Setting: Behavior of the Digital Outputs 9-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.8 Setting: Pulse Duration 9-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.9 Command: Open and Close Gate 9-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.10 Command: Set Counter 9-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.11 Initiating a Process Interrupt 9-24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10 Encoder Signals and Their Evaluation 10-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.1 Overview 10-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.2 5 V Differential Signals 10-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.3 24 V Signals 10-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.4 Pulse Evaluation 10-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11 DB Assignments 11-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12 M7 Reference Counter Function Library 12-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.1 M7CntDisableOut 12-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.2 M7CntDisableSet 12-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.3 M7CntEnableOut 12-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.4 M7CntEnableSet 12-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.5 M7CntInit 12-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.6 M7CntLoadAndStart 12-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.7 M7CntLoadComp 12-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.8 M7CntLoadDirect 12-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contents
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vii
FM 450-1 Counter Function Module
C79000-G7076-C450-01
12.9 M7CntLoadPrep 12-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.10 M7CntPar 12-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.11 M7CntRead 12-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.12 M7CntReadDiag 12-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.13 M7CntReadLoadValue 12-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.14 M7CntReadParError 12-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.15 M7CntReadStatus 12-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.16 M7CntResetStatus 12-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.17 M7CntStart 12-21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.18 M7CntStop 12-22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.19 M7CntStopAndRead 12-23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.20 M7CNT_DIAGINFO 12-24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.21 M7CNT_PARAM 12-25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.22 M7CNT_STATUS 12-28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.23 Error Codes 12-29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13 Faults and Diagnostics 13-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13.1 Fault Indication via the Diagnostics LEDs 13-2. . . . . . . . . . . . . . . . . . . . . . . . . . .
13.2 Initiation of Diagnostics Interrupts 13-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13.3 Data Errors 13-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13.4 Operator Errors 13-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A Technical Specifications A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.1 Technical Specifications A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B Spare Parts B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C References C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glossary Glossary-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Index Index-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contents
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viii FM 450-1 Counter Function Module
C79000-G7076-C450-01
Contents
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1-1
FM 450-1 Counter Function Module
C79000-G7076-C450-01
Product Overview
This chapter gives you an overview of the FM 450-1 function module.
SYou will learn what the FM 450-1 can do.
SYou will become familiar with the application areas of the FM 450-1
through examples.
SYou will learn how the FM 450-1 is linked into the S7-400/M7-400 pro-
grammable controller and you will become familiar with the most impor-
tant components of the FM 450-1.
Section Contents Page
1.1 What Can the FM 450-1 Do? 1-2
1.2 Application Areas of the FM 450-1 1-4
1.3 FM 450-1 Hardware 1-5
1.4 FM 450-1 Software 1-7
This Chapter...
Chapter
Overview
1
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1
1-2 FM 450-1 Counter Function Module
C79000-G7076-C450-01
1.1 What Can the FM 450-1 Do?
The FM 450-1 function module is a high-speed counter module for use in the
S7-400/M7-400 programmable controller. There are two counters on the
module and they can operate in the following ranges:
S0 to 4,294,967,295 (0 to 232 – 1) or
S- 2,147,483,648 to + 2,147,483,647 (–231 to 231 – 1).
The maximum input frequency of the counter signals is up to 500 kHz de-
pending on the encoder signal.
You can use the FM 450-1 for the following counting tasks:
SContinuous counting
SUp/down counting once
SPeriodic up/down counting
You can start and stop the count either via the user program (software gate)
or via external signals (hardware gate).
For each counter, you can store on the module two comparison values as-
signed to the two relevant outputs on the module. If the counter status
reaches one of the two comparison values, the relevant output can be set to
initiate control actions direct in the process.
You can specify a starting value (load value) to the FM 450-1 for each
counter. The counter is set to the starting value if a software or hardware sig-
nal is present at the module.
The FM 450-1 can trigger a process interrupt in the CPU if the comparison
values are reached, or in the case of overflow, underflow and/or in the case of
zero pass of a counter.
The FM 450-1 can trigger a diagnostics interrupt if any of the following oc-
cur:
SFault in external auxiliary voltage
SFault in 5.2 VDC encoder supply
SModule not parameterized or errors in parameterization
SWatchdog triggered
SRAM defective
SProcess interrupt lost
SFault in signal A, B or N
What Can the
FM 450-1 Do?
Comparison
Values
Starting Value
Process Interrupts
Diagnostics
Interrupts
Product Overview
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1
1-3
FM 450-1 Counter Function Module
C79000-G7076-C450-01
You can specify a pulse duration for the digital outputs of the FM 450-1. The
pulse duration specifies how long the relevant digital output is to be set. You
can specify a value between 0 and 500 ms for the pulse duration. This value
applies for both outputs. You can adapt the FM 450-1 to existing actuators by
specifying a pulse duration.
The FM 450-1 can count signals generated by the following encoders:
SIncremental 5 V encoders
SIncremental 24 V encoders
S24 V pulse encoders with direction level
S24 V initiators without direction level
for example, light barrier or BERO
For the purpose of suppressing interference, you can parameterize input fil-
ters (RC elements) with a uniform filter time for the 24 V inputs A*, B* and
N* and for the digital inputs. The following two input filters are available:
Table 1-1 Input Filters
Features Input Filter 1
(Default) Input Filter 2
Typical input delay 1 s15 s
Maximum counting frequency 200 kHz 20 kHz
Minimum pulse width of the count
signals 2.5 s25 s
Pulse Duration
Which Signals Can
the FM 450-1
Count?
Input Filter
Product Overview
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1
1-4 FM 450-1 Counter Function Module
C79000-G7076-C450-01
1.2 Application Areas of the FM 450-1
The main application area of the FM 450-1 is where signals with high fre-
quencies are counted and high-speed responses have to be triggered to prede-
fined counter statuses.
Examples include:
SPackaging plants
SSorting plants
SDosing or proportioning plants.
In this example, a carton must be filled with a specific number of parts. One
counter of the FM 450-1 counts the parts and controls the motor for trans-
porting the parts and the motor for transporting the carton.
If the carton is in the correct position, conveyor belt A is stopped via the light
barrier, the count is started and the motor for conveyor belt B is switched on.
When the carton contains the programmed number of parts, the FM 450-1
stops the motor for conveyor belt B and switches on the motor for conveyor
belt A for removal of the carton. The count can start again when the next
carton reaches the light barrier.
Gate
Motor
Motor
Light barrier
FM 450-1
Belt A
Belt B
Figure 1-1 Example for Using an FM 450-1 in the S7-400
Where Can You
Use the FM 450-1?
Example for the
Use of an FM 450-1
Product Overview
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1
1-5
FM 450-1 Counter Function Module
C79000-G7076-C450-01
1.3 FM 450-1 Hardware
Figure 1-2 shows the FM 450-1 module with front connector attached.
Labeling strips
Diagnostics
and status LEDs
Type plate
Version
Order number
Front connector
Figure 1-2 Representation of the FM 450-1
The full order number of the FM 450-1 is shown on the rating plate.
The abbreviated order number and the version of the FM 450-1 are given at
the top end of the module front.
View of Module
Order Number and
Version
Product Overview
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1
1-6 FM 450-1 Counter Function Module
C79000-G7076-C450-01
The FM 450-1 has 16 LEDs that are used both for diagnostics and for indicat-
ing the status of the FM 450-1 and its digital inputs and outputs. Table 1-2
gives the labeling, color and function of the LEDs.
Table 1-2 Labeling, Color and Function of the LEDs
Labeling Color Function
INTF red Internal Fault
EXTF red External Fault
CH1 CR
CH2 CR
green Counter running; status of the least significant bit of counter 1
(CH 1) or counter (CH 2)
CH1 DIR
CH2 DIR
green Direction of count; LED lights up if counter 1 (CH 1) or
counter 2 (CH 2) is counting down.
CH1 IN 0
CH2 IN 0
green Status of input 1I0 of counter 1 or 2I0 of counter 2
CH1 IN 1
CH2 IN 1
green Status of input 1I1 of counter 1 or 2I1 of counter 2
CH1 IN 2
CH2 IN 2
green Status of input 1I2 of counter 1 or 2I2 of counter 2
CH1 OUT 0
CH2 OUT 0
green Status of output 1Q0 of counter 1 or 2Q0 of counter 2
CH1 OUT 1
CH2 OUT 1
green Status of output 1Q1 of counter 1 of 2Q1 of counter 2
The front connector has the following connections:
S5 V or 24 V encoder signals for counter 1 and 2
SEncoder supply
SDigital input signals for starting, stopping and setting counter 1 and 2
SDigital output signals Q0 and Q1 for counter 1 and 2
SAuxiliary voltage 1L+ for generating the encoder supply voltages
SLoad voltage 2L+ for supplying the digital outputs
The front connector must be ordered separately (see Appendix B).
When you swing the front connector down into position, the front connector
coding engages. Thereafter, this front connector can only be attached to an
FM 450-1 module.
Enclosed with the module is a labeling block with four labeling strips on
which you can write your relevant signal names.
Diagnostics and
Status LEDs
Front Connector
Front Connector
Coding
Labeling Strips
Product Overview
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1
1-7
FM 450-1 Counter Function Module
C79000-G7076-C450-01
1.4 FM 450-1 Software
To integrate the FM 450-1 into the S7-400, you require a software package
with
SParameter assignment screen forms
SSoftware for the CPU
The software for integrating the FM 450-1 into the M7-400 is described in
Chapters 7 and 12.
The FM 450-1 is adapted to the task in hand via parameters. These parameter
are stored in an SDB and transferred to the module from the CPU.
You can specify the parameters via parameter assignment screen forms.
These parameter assignment screen forms are installed on your programming
device and called up within STEP 7.
The software for the CPU consists of the FC CNT_CTRL function called in
the user program of the CPU. This FC enables communication between the
CPU and the FM 450-1. In addition, there is also the FC DIAG_INF function
for the FM 450-1, with which you can transfer diagnostics information into
the DB of the FC CNT_CTRL.
Figure 1-3 shows an S7-400 configuration with an FM 450-1 and several sig-
nal modules.
Programming
device (PG) with STEP 7 and
the parameterization screen
forms
CPU
with user program
and FCs of the
FM 450-1 FM 450-1
Figure 1-3 SIMATIC S7-400 Configuration with an FM 450-1
FM 450-1 Software
Packages
Parameter
Assignment
Screen Forms
Software for the
S7-400-CPU
Product Overview
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1
1-8 FM 450-1 Counter Function Module
C79000-G7076-C450-01
Product Overview
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2-1
FM 450-1 Counter Function Module
C79000-G7076-C450-01
How the FM 450-1 Counts
This chapter contains explanations of the most important terms for counting
with the FM 450-1.
Section Contents Page
2.1 Definitions 2-2
2.2 Gate Functions 2-5
This Chapter...
Chapter
Overview
2
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2
2-2 FM 450-1 Counter Function Module
C79000-G7076-C450-01
2.1 Definitions
Counting refers to the process of capturing and summing up events. In the
case of the FM 450-1 function module, encoder signals are captured and eva-
luated accordingly.
The FM 450-1 can count up and down. By selecting the count range, you
define the limits within which the FM 450-1 can count.
Count Range Lower Count Limit Upper Count Limit
Count range 1: 32 bits 0 + 4,294,967,295
Count range 2: + 31 bits – 2,147,483,648 + 2,147,483,647
You can specify a starting value to the FM 450-1 for each of the two count-
ers. Counting starts at this value. The starting value is referred to as the load
value. The load value can be any value within the count limits.
In order to be able to trigger responses in the process independently of the
CPU when a specific counter status is reached, you can use two of the mo-
dule’s digital outputs for each counter. You store two comparison values on
the FM 450-1 for each counter. If the counter status reaches either of the two
comparison values, the digital output assigned to the comparison value is set
and/or a process interrupt is generated.
In the example in Section 1.2, the motor for conveyor belt B is to be stopped
as soon as the carton contains the programmed number of parts. For this pur-
pose, you can specify this number to the FM 450-1 as the comparison value
for counter 1, for example, and use the assigned digital output to stop the
motor.
With the FM 450-1, you can count rectangular pulses in three different ways:
SContinuous counting, with or without gate function
SSingle count, with hardware or software gate
SPeriodic counting, with hardware or software gate
The differences between the methods become obvious in the behavior of the
FM 450-1 when a counter has reached a count limit.
What is Counting?
Count Range,
Count Limits
Load Value
Comparison
Values
Example
Three Different
Counting Methods
How the FM 450-1 Counts
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2
2-3
FM 450-1 Counter Function Module
C79000-G7076-C450-01
If a counter reaches the upper limit when counting up, and if another count
pulse comes, the counter jumps to the lower count limit and starts to add the
count pulses again; so it continues to count continuously.
If a counter reaches the lower limit when counting down, and if another
count pulse comes, it jumps to the upper count limit and continues to count
down from there.
Upper count limit
Lower count limit
Counter status
Time
Figure 2-1 Continuous Counting in the Up Direction
In single counting, the counter starts at the load value. If a counter reaches
the upper count limit when counting up, and if another count pulse comes,
the counter jumps to the lower count limit and remains there even if further
count pulses come.
If a counter reaches the lower limit when counting down, and if another
count pulse comes, it jumps to the upper limit and remains there even if fur-
ther count pulses come.
Upper count limit
Lower count limit
Counter status
Time
Load value
Figure 2-2 Single Counting in the Up Direction
Continuous
Counting
Single Counting
How the FM 450-1 Counts
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2
2-4 FM 450-1 Counter Function Module
C79000-G7076-C450-01
In periodic counting, the counter starts from the load value. When the
counter reaches the upper limit when counting up, and if a another count
pulse comes, it jumps to the load value and starts to add the count pulses
again.
If a counter reaches the lower limit when counting down, and if another
count pulse comes, it jumps to the load value and continues to count down
from there.
Upper count limit
Lower count limit
Counter status
Time
Load value
Figure 2-3 Periodic Counting in the Up Direction
Periodic Counting
How the FM 450-1 Counts
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