Siemens CM 1542-5 User manual

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SIMATIC NET
S7-1500 - PROFIBUS
CM 1542-5
Operating Instructions
11/2018
C79000
-G8976-C290-04
Preface
Guide to the documentation
1
Product overview, functions
2
Installation, connecting up,
commissioning, operation
3
Configuration, programming
4
Diagnostics and upkeep
5
Technical specifications
6
Approvals
7

Siemens AG
Division Process Industries and Drives
Postfach 48 48
90026 NÜRNBERG
GERMANY
C79000-G8976-C290-04
Ⓟ
11/2018 Subject to change
Copyright © Siemens AG 2013 - 2018.
All rights reserved
Legal information
Warning notice system
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The product/system described in this documentation may be operated only by
personnel qualified
for the specific
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualified personnel are those who, based on their training and experience, are capable of identifying risks and
avoiding potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
ambient conditions must be complied with. The information in the relevant documentation must be observed.
Trademarks
All names identified by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication
may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.
Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.

CM 1542-5
Operating Instructions, 11/2018, C79000-G8976-C290-04 3
Preface
Purpose of the documentation
This device manual supplements the system manual of the automation system S7-1500 and
the function manuals. All functions that go beyond the system are described in the system
manual.
With the information in this manual and the system manual, you will be able to commission
the CM 1542-5 communications module.
Abbreviations and names
●
CM
In this document, the term "CM" (communications module) is used instead of the full
product name "CM 1542-5".
●
STEP 7
The name STEP 7 is used to mean the STEP 7 Professional configuration tool.
New in this edition
●New ATEX/IECEx approval
Replaced edition
Edition 10/2016
Current manual edition on the Internet
You will also find the current version of this manual on the Internet pages of Siemens
Industry Online Support:
Link: (https://support.industry.siemens.com/cs/ww/en/ps/15671/man)
Sources of information and other documentation
See section Guide to the documentation (Page 9).

Preface
CM 1542-5
4Operating Instructions, 11/2018, C79000-G8976-C290-04
License conditions
Note
Open source software
The product contains open
source software. Read the license conditions for open source
software carefully before using the product.
You will find license conditions in the following document on the supplied data medium:
●OSS_CM15425_86.pdf
Firmware
The firmware is signed and encrypted. This ensures that only firmware created by Siemens
can be downloaded to the device.
Security information
Siemens provides products and solutions with industrial security functions that support the
secure operation of plants, systems, machines and networks.
In order to protect plants, systems, machines and networks against cyber threats, it is
necessary to implement – and continuously maintain – a holistic, state-of-the-art industrial
security concept. Siemens’ products and solutions constitute one element of such a concept.
Customers are responsible for preventing unauthorized access to their plants, systems,
machines and networks. Such systems, machines and components should only be
connected to an enterprise network or the internet if and to the extent such a connection is
necessary and only when appropriate security measures (e.g. firewalls and/or network
segmentation) are in place.
For additional information on industrial security measures that may be implemented, please
visit
Link: (http://www.siemens.com/industrialsecurity)
Siemens’ products and solutions undergo continuous development to make them more
secure. Siemens strongly recommends that product updates are applied as soon as they are
available and that the latest product versions are used. Use of product versions that are no
longer supported, and failure to apply the latest updates may increase customers’ exposure
to cyber threats.
To stay informed about product updates, subscribe to the Siemens Industrial Security RSS
Feed under
Link: (http://www.siemens.com/industrialsecurity)
Observe the following security recommendations to prevent unauthorized access to the
system.
●Evaluate your plant as a whole in terms of security. Use a cell protection concept with
suitable products.
●Keep the firmware up to date. Check regularly for security updates of the firmware and
use them.

Preface
CM 1542-5
Operating Instructions, 11/2018, C79000-G8976-C290-04 5
●Restrict physical access to the device to qualified personnel.
●Configure a protection level of the CPU.
Recycling and disposal
The product is low in pollutants, can be recycled and meets the requirements of the WEEE
directive 2012/19/EU "Waste Electrical and Electronic Equipment".
Do not dispose of the product at public disposal sites. For environmentally friendly recycling
and the disposal of your old device contact a certified disposal company for electronic scrap
or your Siemens contact.
Keep to the local regulations.
You will find information on returning the product on the Internet pages of Siemens Industry
Online Support:
Link: (https://support.industry.siemens.com/cs/ww/en/view/109479891)
SIMATIC NET glossary
Explanations of many of the specialist terms used in this documentation can be found in the
SIMATIC NET glossary.
You will find the SIMATIC NET glossary on the Internet at the following address:
Link: (https://support.industry.siemens.com/cs/ww/en/view/50305045)

Preface
CM 1542-5
6Operating Instructions, 11/2018, C79000-G8976-C290-04

CM 1542-5
Operating Instructions, 11/2018, C79000-G8976-C290-04 7
Table of contents
Preface ................................................................................................................................................... 3
1 Guide to the documentation .................................................................................................................... 9
2 Product overview, functions................................................................................................................... 11
2.1 Product data............................................................................................................................11
2.2 Application ..............................................................................................................................12
2.3 Further functions .....................................................................................................................13
2.4 Configuration limits and performance data .............................................................................14
2.4.1 Configuration limits - number of CMs .....................................................................................14
2.4.2 Transmission speeds supported.............................................................................................15
2.4.3 Characteristic data of the DP interface ...................................................................................15
2.4.4 Characteristic data of FDL communication.............................................................................16
2.4.5 Characteristics of S7 communication .....................................................................................17
2.4.6 Performance data / operation .................................................................................................17
2.5 Requirements for use..............................................................................................................18
2.5.1 Project engineering .................................................................................................................18
2.5.2 Programming ..........................................................................................................................18
2.6 LEDs .......................................................................................................................................19
2.7 PROFIBUS interface...............................................................................................................20
3 Installation, connecting up, commissioning, operation ........................................................................... 21
3.1 Important notes on using the device.......................................................................................21
3.1.1 Notes on use in hazardous areas ...........................................................................................21
3.1.2 Notes on use in hazardous areas according to ATEX / IECEx ..............................................22
3.1.3 Notes on use in hazardous areas according to UL HazLoc ...................................................22
3.1.4 Notes on use in hazardous areas according to FM ................................................................23
3.2 Installing and commissioning the CM 1542-5.........................................................................23
3.3 Pin assignment PROFIBUS....................................................................................................24
3.4 Mode of the CPU - effect on the CM.......................................................................................25
4 Configuration, programming .................................................................................................................. 27
4.1 Configuration in STEP 7 .........................................................................................................27
4.2 Program blocks for communication and distributed I/O..........................................................27
4.3 Program blocks for FDL..........................................................................................................28
5 Diagnostics and upkeep ........................................................................................................................ 35
5.1 Diagnostics options.................................................................................................................35
5.2 DP slave diagnostics...............................................................................................................36
5.3 Standard diagnostics ..............................................................................................................37

Table of contents
CM 1542-5
8Operating Instructions, 11/2018, C79000-G8976-C290-04
5.4 Device-specific diagnostics in DP-V1 .................................................................................... 39
5.5 DP diagnostics frames when the CPU is in STOP ................................................................ 42
5.6 Replacing a module without a programming device.............................................................. 42
6 Technical specifications ........................................................................................................................ 43
7 Approvals ............................................................................................................................................. 45
Index .................................................................................................................................................... 51

CM 1542-5
Operating Instructions, 11/2018, C79000-G8976-C290-04 9
Guide to the documentation
1
Introduction
The documentation of the SIMATIC products has a modular structure and covers topics
relating to your automation system.
The complete documentation for the S7-1500 system consists of a system manual, function
manuals and device manuals.
The STEP 7 information system (online help) also supports you in configuring and
programming your automation system.
Overview of the documentation on communication with S7-1500
The following table lists additional documents, which supplement this description of
CM 1542-5 and are available in the Internet.
Table 1- 1 Documentation for the CM 1542-5
Topic
Documentation
Most important contents
System descrip-
tion
System manual: S7-1500 Automation System
(https://support.industry.siemens.com/cs/ww/e
n/view/59191792)
•Application planning
•Installation
•Connecting
•Commissioning
Module properties Device manual: Power supplies
(https://support.industry.siemens.com/cs/ww/e
n/ps/13721/man)
•Connecting
•Parameter assignment/
addressing
•Interrupts, error messages,
diagnostics and system
alarms
•Technical specifications
•Dimensional drawing
Device manual: Signal modules
(https://support.industry.siemens.com/cs/ww/e
n/ps/13743/man)
System diagnos-
tics
Function manual: System diagnostics
(https://support.industry.siemens.com/cs/ww/e
n/view/59192926)
•Overview
•Diagnostics evaluation for
hardware/software
Communication Function manual: Communication
(https://support.industry.siemens.com/cs/ww/e
n/view/59192925)
•Overview
Function manual PROFINET with STEP 7
(https://support.industry.siemens.com/cs/ww/e
n/view/49948856)
•PROFINET basics
•PROFINET functions
•PROFINET diagnostics

Guide to the documentation
CM 1542-5
10 Operating Instructions, 11/2018, C79000-G8976-C290-04
Topic
Documentation
Most important contents
Function manual PROFIBUS with STEP 7
(https://support.industry.siemens.com/cs/ww/e
n/view/59193579)
•PROFIBUS basics
•PROFIBUS functions
•PROFIBUS diagnostics
Function manual: Web Server
(https://support.industry.siemens.com/cs/ww/e
n/view/59193560)
•Function
•Operation
Interference-free
installation of
control systems
Function Manual: Interference-free installation
of control systems
(https://support.industry.siemens.com/cs/ww/e
n/view/59193566)
•Basics
•Electromagnetic compatibil-
ity
•Lightning protection
•Housing selection
Memory concept Function manual: Structure and Use of the
CPU Memory
(https://support.industry.siemens.com/cs/ww/e
n/view/59193101)
•Design
•Principle of operation
•Use
Cycle and re-
sponse times
Function manual: Cycle and Response Times
(https://support.industry.siemens.com/cs/ww/e
n/view/59193566)
•Basics
•Calculations
Analog value
processing
Function manual: Analog value processing
(https://support.industry.siemens.com/cs/ww/e
n/view/67989094)
•Wiring options
•Tables of measured values
SIMATIC manuals
All current manuals for SIMATIC products are available for download free of charge from the
Internet:
Link: (http://www.siemens.com/automation/service&support)
CP/CM documentation in the SIMATIC NET Manual Collection (article number A5E00069051)
The "SIMATIC NET Manual Collection" DVD contains the device manuals and descriptions
of all SIMATIC NET products current at the time it was created. It is updated at regular
intervals.
Version History / current downloads for the SIMATIC NET S7-CPs/CMs
The "Version History/Current Downloads for SIMATIC NET S7 CPs (PROFIBUS)" provides
information on all CPs available up to now for SIMATIC S7 (PROFIBUS). You will find the
document on the Internet:
Link: (https://support.industry.siemens.com/cs/ww/en/view/67225941)

CM 1542-5
Operating Instructions, 11/2018, C79000-G8976-C290-04 11
Product overview, functions
2
2.1
Product data
Article number, validity and product names
This description contains information on the following product:
CM 1542-5
Article number 6GK7 542-5DX00-0XE0
Hardware product version 1
Firmware version V2.0.15
Communications module CM 1542-5 for connection of S7-1500 to PROFIBUS DP
View of the module
①
LEDs
②
Type plate
③
PROFIBUS interface: 1 x 9-pin D-sub female connector (RS-485)
Figure 2-1 CM 1542-5 with closed (left) and open (right) front cover

Product overview, functions
2.2 Application
CM 1542-5
12 Operating Instructions, 11/2018, C79000-G8976-C290-04
2.2
Application
Application
The communications module CM 1542-5 is intended for operation in an S7-1500 automation
system. The CM 1542-5 allows the connection of an S7-1500 station to a PROFIBUS
fieldbus system.
As an alternative, the CM can be operated in the following modes:
●Class 1 DP master
●DP slave
Supported communications services
In its current configuration, the CM 1542-5 communications module supports the following
communications services:
●
PROFIBUS DP master
(class 1)
–DP master according to EN 50170, DP-V1
–DP master mode for DP slaves according to PROFIBUS DP-V0 and DP-V1
–DP master mode for Siemens DP slaves
–Direct data exchange (DP slave to DP slave)
As a DP master, the CM 1542-5 is capable of enabling direct data exchange for its
assigned DP slaves.
–SYNC/FREEZE
The outputs or inputs can be synchronized by the user program using system function
DPSYNC_FR.
●
PROFIBUS DP slave
DP slave according to EN 50170, DP-V0 / DP-V1
Note
DP master or DP slave
The CM only supports operation either as DP master or DP slave.
●
FDL
The CM handles the FDL communication using program blocks of Open User
Communication (OUC) see section Configuration, programming (Page 27).

Product overview, functions
2.3 Further functions
CM 1542-5
Operating Instructions, 11/2018, C79000-G8976-C290-04 13
●
S7 communication
–PG communication for uploading / downloading of S7 configuration, diagnostics and
routing
–Operator control and monitoring functions (HMI communication)
–Data exchange over S7 connections
●
Data record routing / field device parameter assignment
You can use the CM as a router for data records intended for field devices (DP slaves).
Data records from devices that are not connected directly to PROFIBUS and therefore
have no direct access to the DP slaves are forwarded to the DP slaves by the CM.
The services of the CM 1542-5 listed above can be used independently at the same time.
Note
Requirement for FDL, data record routing, loading of configuration/diagnostics data
For the functions FDL, data record routing and loading configuration and diagnostics data
the CM must either be operated in the mode DP master mode or as a DP slave with the
option "Test, Commissioning and Routing" enabled.
2.3
Further functions
Enabling /disabling DP slave - in the standard system
DP slaves can be activated and deactivated by the user program using system function
D_ACT_DP.
Diagnostics requests
As a DP master (class 1), the CM 1542-5 supports diagnostics requests of a DP master
(class 2).
Getting the bus topology in a DP master system
The CM 1542-5 operating as DP master supports the measurement of the PROFIBUS bus
topology in a DP master system using a diagnostics repeater (DP slave).
System function DP_TOPOL in the user program can instruct diagnostics repeaters to
measure the PROFIBUS BUS topology in a DP master system.

Product overview, functions
2.4 Configuration limits and performance data
CM 1542-5
14 Operating Instructions, 11/2018, C79000-G8976-C290-04
Time-of-day synchronization - time master or time slave
The CM 1542-5 can be enabled for time-of-day synchronization. As an alternative, the CM
can be configured as time master or time slave on PROFIBUS.
●Time master: The CM is synchronized using the time of day in the S7-1500 station and
outputs the time of day on PROFIBUS. The output interval can be set.
●Time slave: The CM receives time-of-day frames on PROFIBUS and outputs the time
within the S7-1500 station. The output interval within the S7-1500 station is set
permanently to 10 seconds.
Note
Recommendation for setting the time
It is advisable to set the time
-of-day master so that time-of-day frames are sent at interval
s of
approximately 10 seconds. This achieves as small a deviation as possible between the
internal time and the absolute time.
Web diagnostics
With the aid of Web diagnostics of the CPU, you read the diagnostics data from an S7
station via the Web browser on the PG/PC.
In terms of the CM, the Web pages provide the following information:
●Module and status information
●Special information on the DP master system (status of the DP slaves)
2.4
Configuration limits and performance data
2.4.1
Configuration limits - number of CMs
When using the CM type described here, the following limits apply:
●The number of CMs that can be operated in a rack depends on the CPU type being used.
Refer to the information in the system manual (hardware configuration), see Guide to the
documentation (Page 9).

Product overview, functions
2.4 Configuration limits and performance data
CM 1542-5
Operating Instructions, 11/2018, C79000-G8976-C290-04 15
2.4.2
Transmission speeds supported
The transmission speed is set in STEP 7.
Note
Remember the cable length
For the selected transmission speed, the permitted cable
length must be kept to.
For this refer to the information in the PROFIBUS function manual:
Link: (https://support.industry.siemens.com/cs/ww/en/view/59193579)
2.4.3
Characteristic data of the DP interface
Characteristic data of DP mode
No special program blocks are required for DP mode. The interfacing to the distributed I/O is
by direct I/O access or using program blocks (SFCs/SFBs) of the CPU.
Table 2- 1 Characteristic data of DP mode
Characteristic
Explanation / values
Max. number of operable DP slaves
125 *
Max. size of the input area of all DP slaves
8 KByte
Max. size of the output area of all DP slaves
8 KByte
Maximum number of inputs per DP slave
244 Byte
Maximum number of outputs per DP slave
244 Byte
Max. size of the consistent area for a module
128 Byte
* When using DP slaves with extensive configuration data e.g. SINAMICS devices, the number of DP
slaves that can be operated on the CM sinks.
Diagnostics requests
As a DP master (class 1), the CM 1542-5 supports diagnostics requests of a DP master
(class 2).

Product overview, functions
2.4 Configuration limits and performance data
CM 1542-5
16 Operating Instructions, 11/2018, C79000-G8976-C290-04
DP startup behavior
Note
Increasing the default value for startup parameters - configuration of the CPU
In some situations, it is necessary to increase the default value for the startup parameter
"Parameter assignment
time for the distributed I/O" in the configuration of the CPU:
•
A large number of modules (DP slaves) is configured.
•
When a high value is configured for the constant bus cycle time in the network properties
of the PROFIBUS DP line.
2.4.4
Characteristic data of FDL communication
Characteristic data FDL
The characteristic data is important when operating FDL connections (specified, free layer 2
(SDA and SDN), broadcast, multicast):
Table 2- 2 Characteristic data FDL
Characteristic
Explanation / values
Total number of FDL connections that can
be operated
30 max.
Size of the transferable data area for FDL
connections
•1...240 bytes max. per specified FDL connection (for sending and receiv-
ing):
•Free layer 2 broadcast and multicast:
Up to 236 bytes of user data can be transferred per job. The job header
occupies an additional 4 bytes.
Note
Connection resources of the CPU
Depending on the CPU type,
different numbers of connection resources are available. The
number of connection resources is the decisive factor for the number of configurable
connections. For this reason, lower values than specified here can result.
You will find detailed information
on the topic of connection resources in the
"Communication" function manual, see Communication
(
http://support.automation.siemens.com/WW/view/en/59192925).

Product overview, functions
2.4 Configuration limits and performance data
CM 1542-5
Operating Instructions, 11/2018, C79000-G8976-C290-04 17
2.4.5
Characteristics of S7 communication
Characteristics of S7 communication
The following information is important when operating S7 connections:
Table 2- 3 Characteristics of S7 connections
Characteristic
Explanation / values
Number of S7 connections via
PROFIBUS
Operable in total: Max. 48
The value depends on the S7-1500 CPU being used.
Note
PG or HMI functions or data record routing
If PG or HMI functions or data record routing are used, a suitable number of S7 connections
must be reserved during configuration!
Help provided by STEP 7
The number of connections on PROFIBUS shown in the table above can vary due to other
influencing factors. The STEP 7 configuration tool displays warnings and help messages as
soon as limit values are exceeded.
2.4.6
Performance data / operation
Measured values of transfer or reaction times
Measured values of transfer and reaction times in Ethernet, PROFIBUS and PROFINET
networks for a series of configurations can be found on the Internet:
Link: (https://support.industry.siemens.com/cs/ww/en/view/25209605)

Product overview, functions
2.5 Requirements for use
CM 1542-5
18 Operating Instructions, 11/2018, C79000-G8976-C290-04
2.5
Requirements for use
2.5.1
Project engineering
Configuration
For configuring the CM the following version of STEP 7 is required:
STEP 7 version
Functions of the CM
STEP 7 Professional V14 The full functionality of the CP 1542-5
(6GK7 542-5DX00-0XE0) can be configured.
Downloading configuration data
When the configuration data is loaded on the CPU, the CM is supplied with the relevant
configuration data. The configuration data can be downloaded to the CPU via PROFIBUS or
any PROFINET interface of the S7-1500 station.
2.5.2
Programming
Programming
For programming the CM the following version of STEP 7 is required:
STEP 7 version
Functions of the CM
STEP 7 Professional V14 The full functionality of the CP 1542-5
(6GK7 542-5DX00-0XE0) can be programmed.
Use of FDL
For programming and using FDL, the following minimum firmware versions are required.
●CM: V2.0
●CPU: V2.0

Product overview, functions
2.6 LEDs
CM 1542-5
Operating Instructions, 11/2018, C79000-G8976-C290-04 19
2.6
LEDs
The status and error displays of the CM 1542-5 are described below.
You can find additional information on "Interrupts" in the STEP 7 online help.
You can find additional information on "Diagnostics" and "System alarms" in the function
manual on the Internet:
Link: (https://support.industry.siemens.com/cs/ww/en/view/59192926)
LED display
The following figure shows the LEDs of the CM 1542-5.
①
RUN/STOP LED
②
ERROR LED
③
MAINT LED
Figure 2-2 LED display of the CM 1542-5 (without front cover)
Meaning of the LED displays
The CM 1542-5 has 3 LEDs to display the current operating status and the diagnostics
status and these have the following meanings:
•
RUN/STOP LED
(one
-color LED: green)
•
ERROR LED
(one
-color LED: red)
•
MAINT LED
(one
-color LED: yellow)

Product overview, functions
2.7 PROFIBUS interface
CM 1542-5
20 Operating Instructions, 11/2018, C79000-G8976-C290-04
The following table shows the meaning of the various combinations of colors of the
RUN/STOP, ERROR and MAINT LEDs.
Table 2- 4 Meaning of the LEDs
RUN/STOP LED
ERROR LED
MAINT LED
Meaning
LED off
LED off
LED off
No supply voltage on the CM or supply
voltage too low.
LED lit green
LED lit red
LED lit yellow
LED test during startup
LED lit green
LED lit red
LED off
Startup (booting the CM)
LED lit green LED off LED off
CM is in RUN mode.
No disruptions
LED flashing
green
LED off LED off
No CM configuration exists
Loading firmware
LED lit green
LED flashing red
LED off
A diagnostics event has occurred.
LED lit green
LED off
LED lit yellow
Maintenance is demanded.
LED lit green LED off
LED flashing
yellow
Maintenance is required.
LED flashing
green
LED flashing red
LED flashing
yellow
Module fault
2.7
PROFIBUS interface
9-pin D-sub female connector (PROFIBUS)
The PROFIBUS connector is located behind the cover of the housing. The interface is a 9-
pin D-sub female connector operating according to the RS-485 standard.
You also have the option of connecting to optical PROFIBUS networks via an Optical Bus
Terminal OBT or an Optical Link Module OLM.
You will find the pin assignment of the D-sub socket in section Pin assignment PROFIBUS
(Page 24).