Siemens SIMATIC FM 452 User manual

Preface, Contents
User Information
Product Overview 1
Basics of Cam Control 2
Installing and Removing the
FM 452 3
Wiring the FM 452 Electronic
Cam Controller 4
Installing the Software 5
Programming the FM 452 6
Putting the FM 452 into Operation 7
Reference Information
Machine Data and Cam Data 8
Settings 9
Encoders 10
Diagnostics 11
Samples 12
Appendices
Technical Specifications A
Connection Diagrams B
Data Blocks/Error Lists C
Index
02/2000
C79000-G7076-C452
Edition 04
FM 452
Electronic Cam Controller
Installation and Parameter
Assignment
Manual
This manual is part of the documentation package
with the order number:
6ES7452-1AH00-8BG0
SIMATIC

This manual contains notices which you should observe to ensure your own personal safety, as
well as to protect the product and connected equipment. These notices are highlighted in the ma-
nual by a warning triangle and are marked as follows according to the level of danger:
!Danger
indicates that death, severe personal injury or substantial property damage will result if proper
precautions are not taken.
!Warning
indicates that death, severe personal injury or substantial property damage can result if proper
precautions are not taken.
!Caution
indicates that minor personal injury or property damage can result if proper precautions are not
taken.
Note
draws your attention to particularly important information on the product, handling the product,
or to a particular part of the documentation.
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 systems in accordance with established safety practices and standards.
Note the following:
!Warning
This device and its components may only be used for the applications described in the catalog or
the technical description, and only in connection with devices or components from other manu-
facturers which have been approved or recommended by Siemens.
This product can only function correctly and safely if it is transported, stored, set up, and instal-
led correctly, and operated and maintained as recommended.
SIMATIC, SIMATIC NET and SIMATIC NETare registered trademarks of
SIEMENS AG.
Third parties using for their own purposes any other names in this document which refer to trade-
marks might infringe upon the rights of the trademark owners.
We have checked the contents of this manual for agreement with the
hardwareand software described. Since deviations cannot be
precluded entirely, we cannot guarantee full agreement. However,
the data in this manual are reviewed regularly and any necessary
corrections included in subsequent editions. Suggestions for
improvement are welcomed.
Disclaimer of LiabilityCopyright Siemens AG 1996 All rights reserved
The reproduction, transmission or use of this document or its
contents is not permitted without express written authority.
Offenders will be liable for damages. All rights, including rights
createdby patent grant or registration of a utility model or design, are
reserved.
SiemensAG
Bereich Automatisierungs- und Antriebstechnik
Geschaeftsgebiet Industrie-Automatisierungssysteme
Postfach 4848, D-90327 Nuernberg SiemensAG 1996
Subject to technical change.
Siemens Aktien
g
esellschaft C79000-G7076-C452
Notes on Safety
Qualified Personnel
Correct Usage
Trademarks

iii
FM 452 Electronic Cam Controller
C79000-G7076-C452-04
Preface
Validity of the Manual
This manual contains the description of the FM 452 electronic cam controller valid
at the time the manual was printed. We reserve the right to describe modifications
in the functionality of the FM 452 in a product information leaflet.
The Manual with the
N mber in the Page Footer
... is Valid for the FM 452
N
um
b
er
i
n t
h
e
P
age
F
ooter
.... MLFB (Order Number) Version
EWA 4NEB 720 6012-02
6ES7 452-1AH00-0AE0
43 2
1 =
EWA 4NEB 720 6012-02 a
6ES
7
4
5
2
-
1AH00
-
0AE0
54 3
2 = 43 2 or
C79000-G7076-C452 6ES7 452-1AH00-0AE0
87 6
5 =
Contents of the Manual
This manual describes the hardware and software of the FM 452 electronic cam
controller.
It consists of the following:
•A section describing basic aspects (Chapters 1 to 7)
•A reference section (Chapters 8 to 12)
•An appendix (Chapters A, B and C)
•An index.

Preface
iv FM 452 Electronic Cam Controller
C79000-G7076-C452-04
Further Support
If you have questions about using the products described in the manual and you
cannot find the answers here, please contact your local Siemens representative.
You will find the addresses, for example, in the appendix ”SIEMENS Worldwide” in
the installation manual S7-400/M7-400 Programmable Controllers, Hardware and
Installation .
If you have any questions or comments on this manual, please fill out the remarks
form at the end of the manual and return it to the address shown on the form. We
would be grateful if you could take the time to answer the questions giving your
own personal opinion of the manual.
To help you to become familiar with working with SIMATIC S7 PLCs,
we offer a range of courses.
Please contact your regional training center or the central training center in
D-90027 Nuremberg, Tel. [phone] for more information.
CE Mark
Our products meet the requirements of the EU directive 89/336/EEC
”Electromagnetic Compatibility” and the harmonized European standards (EN)
listed in the directive.
In compliance with the above mentioned EU directive, Article 10, the conformity
declarations are available for the relevant authorities at the following address:
Siemens Aktiengesellschaft
Bereich Automatisierungstechnik
A&D AS E48
Postfach 1963
92209 Amberg
Germany

v
FM 452 Electronic Cam Controller
C79000-G7076-C452-04
Contents
1 Product Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 What is the FM 452? 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Areas of Application of the FM 452 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Structure of an Electronic Cam Controller with an FM 452 1-4. . . . . . . . . . . .
2 Basics of Cam Control 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Cams 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Tracks 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.1 Tracks and Track Result 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.2 Special Tracks 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Hysteresis 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Dynamic Adjustment 2-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5 Interfaces of the Cam Controller 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Installing and Removing the FM 452 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Wiring the FM 452 Electronic Cam Controller 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Pinout of the Front Connector 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Wiring the Front Connector 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Installing the Software 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 Programming the FM 452 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1 Basics of Programming an FM 452 6-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2 FC CAM_INIT (FC 0) 6-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3 FC CAM_CTRL (FC 1) 6-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.4 FC CAM_DIAG (FC 2) 6-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.5 FC CAM_MSRM (FC 3) 6-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.6 Data Blocks 6-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.6.1 Templates for Data Blocks 6-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.6.2 Channel DB 6-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.6.3 Diagnostic DB 6-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.6.4 Parameter DB 6-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.7 Interrupts 6-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.8 Technical Specifications 6-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.9 Fast Access to Module Data 6-21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.10 Parameter Transfer Routes 6-22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
vi FM 452 Electronic Cam Controller
C79000-G7076-C452-04
7 Putting the FM 452 into Operation 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 Machine Data and Cam Data 8-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1 Writing and Reading the Machine and Cam Data 8-2. . . . . . . . . . . . . . . . . . . .
8.2 System of Units 8-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.3 Machine Data of the Axis 8-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.4 Absolute Encoder Adjustment 8-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.5 Machine Data of the Encoder 8-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.6 Resolution 8-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.7 Number of Cams and Track Data 8-23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.8 Interrupt Enable 8-25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.9 Cam Data 8-26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9 Settings 9-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.1 Influence of Settings on the Switching Response of Time Cams 9-2. . . . . .
9.2 Set Actual Value / Set Actual Value on-the-fly / Cancel Set Actual Value 9-3
9.3 Zero Offset 9-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.4 Set Reference Point 9-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.5 Changing the Cam Edges 9-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.6 Fast Cam Parameter Change 9-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.7 Length Measurement/Edge Acquisition 9-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.8 Retrigger Reference Point 9-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.9 Deactivating Software Limit Switches 9-22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.10 Simulation 9-23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.11 Counted Values of the Counter Cam Tracks 9-25. . . . . . . . . . . . . . . . . . . . . . . . .
9.12 Position and Track Data 9-26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.13 Encoder Data 9-27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.14 Cam and Track Data 9-28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.15 Control Signals for the Cam Controller 9-29. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.16 Return Signals for the Cam Controller 9-30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.17 Return Signals for Diagnostics 9-31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10 Encoders 10-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.1 Incremental Encoders 10-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.2 Initiators 10-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.3 Absolute Encoders 10-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
vii
FM 452 Electronic Cam Controller
C79000-G7076-C452-04
11 Diagnostics 11-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11.1 Possibilities for Error Evaluation 11-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11.2 Meaning of the Error LEDs 11-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11.3 Diagnostic Interrupts 11-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12 Samples 12-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.1 Introduction 12-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.2 Requirements 12-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.3 Preparing the Samples 12-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.4 Code of the Samples 12-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.5 Testing a Sample 12-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.6 Adapting a Sample 12-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.7 Sample Program 1 “GettingStarted” 12-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.8 Sample Program 2 “Commission” 12-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.9 Sample Program 3 “OneModule” 12-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.10 Sample Program 4 “Interrupts” 12-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.11 Sample Program 5 “MultiModules” 12-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A Technical Specifications A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B Connection Diagrams B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.1 Connection Diagram for Incremental Encoder Siemens 6FX 2001-2
(Up=5V; RS 422) B-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.2 Connection Diagram for Incremental Encoder Siemens 6FX 2001-2
(Up=24V; RS 422) B-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.3 Connection Diagram for Incremental Encoder Siemens 6FX 2001-4
(Up=24V; HTL) B-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.4 Connection Diagram for Absolute Encoder Siemens 6FX 2001-5
(Up=24V; SSI) B-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C Data Blocks/Error Lists C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C.1 Content of the Channel DB C-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C.2 Content of the Parameter DB C-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C.3 Data and Structure of the Diagnostic DB C-12. . . . . . . . . . . . . . . . . . . . . . . . . . . .
C.4 Error Classes C-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Index Index-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
viii FM 452 Electronic Cam Controller
C79000-G7076-C452-04

1-1
FM 452 Electronic Cam Controller
C79000-G7076-C452-04
Product Overview
Chapter Overview
Section Contents Page
1.1 What is the FM 452? 1-2
1.2 Areas of Application of the FM 452 1-3
1.3 Structure of an Electronic Cam Controller with an FM 452 1-4
1

Product Overview
1-2 FM 452 Electronic Cam Controller
C79000-G7076-C452-04
1.1 What is the FM 452?
The FM 452 function module is a single-channel, electronic cam controller and is
used in the S7-400 programmable controller. It supports both rotary and linear
axes. When used for position sensing, you can connect initiators, incremental, or
absolute encoders (SSI). As a slave, the FM 452 can listen in on the SSI frame of
an absolute encoder.
You can use up to a maximum of 128 distance or time cams that you can assign to
32 cam tracks as required. The first 16 cam tracks are output via the digital outputs
on the module. For information about the functions and settings of the cam
controller, please refer to the following chapters.
You can operate several FM 452 modules at the same time. Combinations with
other FM/CP modules are also possible. One typical combination is to use the
module in conjunction with an FM 451 positioning module.
Programming device (PG) with STEP 7 and the
parameter assignment user interface for FM x52
CPU
with user program and blocks of the FM 452
FM 452
Configuration package with
parameter assignment user
interface, blocks and manual
Figure 1-1 Structure of a SIMATIC S7-400 PLC with an FM 452

Product Overview
1-3
FM 452 Electronic Cam Controller
C79000-G7076-C452-04
1.2 Areas of Application of the FM 452
Example: Applying Glue Tracks
In the following example, glue tracks are applied to wooden boards. Each cam
track controls one glue gun via a digital output.
Glue tracks
Wooden board
Direction of
transport
FM 452
Encoder detects axis position
Q 0
Q 1
Q 2
Q 3
Q 4
Digital outputs trigger reactions
Figure 1-2 Example of an Electronic Cam Control Application
Example: Controlling a Press
Another typical application is the automation of an eccentric press with a cam
controller.
This is a rotational process; in other words, after one revolution of the rotary axis,
the function starts again at the beginning.
Typical electronic cam controller tasks in this application include:
•Turning the lubricant supply on and off
•Triggering material feed and removal (for example controlling a gripper)
•Stopping the press at the “upper dead point”
Example: Packaging System
Preserves are packed on a turntable. The electronic cam controller triggers actions
at specific angular positions:
•Placing and folding of cartons on the turntable
•Placing the preserves in the cartons
•Closing the cartons
•Placing the cartons on a conveyor belt

Product Overview
1-4 FM 452 Electronic Cam Controller
C79000-G7076-C452-04
1.3 Structure of an Electronic Cam Controller with an FM 452
Electronic Cam Controller
Figure 1-3 shows the components of an electronic cam controller. The schematic is
explained briefly below.
Power
controller
Safety
system
M
Power
supply
Encoder
Mechanical
transmission
elements
CPU
FM 452 Electronic
Cam Controller
PG/PC
EMER
STOP
Workpiece
Digital outputs Q 0 to 15
Processing
stations
Limit switch
11
Motor
Figure 1-3 Electronic Cam Controller
Power Controller and Safety System
The motor is controlled by the power controller. The power controller can consist of
a contactor circuit, for example, controlled by an FM 451 positioning module.
If the safety system responds (EMER STOP or limit switch), the power controller
turns off the motor.

Product Overview
1-5
FM 452 Electronic Cam Controller
C79000-G7076-C452-04
Motor
The motor is controlled by the power controller and drives the spindle.
FM 452 Electronic Cam Controller
The electronic cam controller detects the current position of the axis using the
information from an encoder. The encoder signals are evaluated (for example
pulses counted) that are proportional to the distances traveled. Depending on the
actual position, the digital outputs are activated or deactivated (“cams”). The
processing stations are controlled via the digital outputs.
Encoder
The encoder supplies information both about position and direction.
CPU
The CPU executes the user program. Data and signals are exchanged between
the user program and the module using function calls.
PG/PC
You assign the required parameters and program the electronic cam controller on a
programming device or PC.
•Parameter assignment: You set parameters for the FM 452 either using the
parameter assignment user interface or using the parameter DB.
•Programming: You program the FM 452 with function blocks that you
incorporate directly in your user program.
•Testing and putting into operation: You test the FM 452 using the parameter
assignment user interface with which you also finally put the system into
operation.

Product Overview
1-6 FM 452 Electronic Cam Controller
C79000-G7076-C452-04

2-1
FM 452 Electronic Cam Controller
C79000-G7076-C452-04
Basics of Cam Control
Chapter Overview
Section Contents Page
2.1 Cams 2-2
2.2 Tracks 2-4
2.3 Hysteresis 2-8
2.4 Dynamic Adjustment 2-10
2.5 Interfaces of the Cam Controller 2-11
2

Basics of Cam Control
2-2 FM 452 Electronic Cam Controller
C79000-G7076-C452-04
2.1 Cams
Types of Cam
With the appropriate parameter settings, each cam can be either a distance cam or
time cam.
Table 2-1 compares the characteristics of both types of cam.
Direction Detection
The direction of movement of the axis is determined as follows:
•With each pulse of an incremental encoder.
•With each error-free frame of an SSI encoder.

Basics of Cam Control
2-3
FM 452 Electronic Cam Controller
C79000-G7076-C452-04
Table 2-1 Definition and Switching of the Two Cam Types
Distance Cam Time Cam
Representation
Cam endCam start
Cam length sActivation
time
Cam start Cam end
s
Parameter
Settings The following parameters are required:
•Cam start
•Cam end
•Activation direction
•Lead time
The following parameters are required:
•Cam start
•Activation time
•Activation direction
•Lead time
Activation
Direction Two activation directions are possible:
•Positive: The cam is activated at the
cam start when the axis is moving in
the direction of increasing actual
values.
•Negative: The cam is activated at the
cam end when the axis is moving in
the direction of decreasing actual
values.
You can set both activation directions at
the same time.
Two activation directions are possible:
•Positive: The cam is activated at the
cam start when the axis is moving in
the direction of increasing actual
values.
•Negative: The cam is activated at the
cam start when the axis is moving in
the direction of decreasing actual
values.
You can set both activation directions at
the same time.
Activation The cam is activated:
•At the cam start when the axis is
moving in a positive direction and the
positive activation direction is set.
•At the cam end when the axis is
moving in a negative direction and
the negative activation direction is
set.
•The actual value is within the range
of the cam.
The cam is activated:
•At the cam start when the direction of
movement of the axis matches the
activation direction.
After it has been activated, the full cam
activation time elapses even if the
direction of movement of the axis
changes after the cam is activated. If the
cam start is passed again during this
time, the cam is not retriggered.
Deactivation The cam is deactivated when:
•The selected distance has been
traveled,
•The activation direction is opposite to
the direction of movement of the axis
and no hysteresis is set,
•The actual value is no longer within
the range of the cam.
The cam is deactivated when the
selected time has expired.
Active length The active length of the cam is defined
by the cam start and cam end.
Cam start and cam end belong to the
active section of the cam.
The active length of the cam depends on
the speed at which the axis travels while
the cam is active.
On Time The on time of the cam depends on the
speed at which the axis travels the
active length of the cam.
The on time of the cam is selected with
the activation time.

Basics of Cam Control
2-4 FM 452 Electronic Cam Controller
C79000-G7076-C452-04
2.2 Tracks
2.2.1 Tracks and Track Result
Tracks
With the 32 tracks, you can control a maximum of 32 different switching actions.
You can evaluate the tracks with the return signals.
Each of the first 16 tracks (track 0 to 15) has a digital output (Q0 to Q15) of the
FM 452 assigned to it that can, for example, control a connected contactor directly.
Track Result
You have a maximum of 128 cams available that can be assigned to any track.
Several cams can be assigned to each track. The track result is obtained by the
logical ORing of all cam values of this track (see Figure 2-4, page 2-11).
Example of a Track Result
During parameter assignment, you specify the following cams for track 3:
Cam Cam start Cam end
1 101 m 106 m
2 100 m 104 m
This results in the following track result:
Cam 1
Cam 2
Track 3
105 m100 m110 m
s
Track result
Figure 2-1 Calculating the Track Result
Track Enable
To allow the track results of tracks 0 to 15 to be applied as track signals to the
digital outputs Q0 to Q15 of the FM 452, the cam tracks you are using must be
enabled.

Basics of Cam Control
2-5
FM 452 Electronic Cam Controller
C79000-G7076-C452-04
External Enable of Tracks 3 to 10
You can set an external enable for tracks 3 to 10 in the machine data. The track
signals 3 to 10 are then ANDed with digital inputs I3 to I10 before they can switch
the respective digital outputs Q3 to Q10 of the FM 452.
A digital output (Q3 to Q10) is switched when the following conditions are met:
•The relevant track is enabled
•At least one cam on this track is active (track result = 1).
•The corresponding digital input I3 to I10 was set by an external event.
Setting the Track Signals
The track signals 0 to 15 (corresponding to digital outputs Q0 to Q15) can be set
via the cam controller or the CPU.

Basics of Cam Control
2-6 FM 452 Electronic Cam Controller
C79000-G7076-C452-04
2.2.2 Special Tracks
Definition
By setting the relevant parameters, you can set tracks 0 to 2 as special tracks, as
follows:
•Track 0 or 1: Counter cam track
•Track 2: Brake cam track
Requirements
The following requirements must be met to allow the use of the special tracks:
•Cams are assigned to the track
•Cam processing is active
•The relevant track is enabled
•The track is selected as a special track
Counter Cam Track
A counter cam track counts the status changes of the track results on this track.
You must specify a value for the counter and start the counter function.
Each rising edge of the track result decrements the counter value of the relevant
track by 1.
As long as the counter value for the counter cam track is higher than 0, the track
flag bit remains 0.
Once the counter value reaches the value 0, the track flag bit is set and, if selected
in the parameter settings, the track signal is set (see Figure 2-4, page 2-11).
At the next falling edge of the track result (all cams on this track are off), the track
flag bit is cleared again and the counter is reset to the specified value.
Cam
Track 0
32 10 3Counterreading44
The maximum counter value set in the machine data is 4
Track flag bit
Figure 2-2 Switching a Counter Cam Track