Siemens CM 1542-1 User manual

CM 1542-1
SIMATIC NET
S7-1500 - PROFINET
CM 1542-1
Operating Instructions
07/2019
C79000
-G8976-C355-04
Preface
Properties and functions
1
LEDs
2
Installation, connecting up,
commissioning, operation
3
Configuration, programming
4
Diagnostics and upkeep
5
Technical specifications
6
Approvals
7
Documentation references
A

Siemens AG
Digital Industries
Postfach 48 48
90026 NÜRNBERG
GERMANY
C79000-G8976-C355-04
Ⓟ
08/2019 Subject to change
Copyright © Siemens AG 2014 - 2019.
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 1542-1
Operating Instructions, 07/2019, C79000-G8976-C355-04 3
Preface
Validity of this manual
This document contains information on the following product:
Communications module CM 1542-1
Article number 6GK7 542-1AX00-0XE0
Hardware product version 1
Firmware version V2.0
Communications module for SIMATIC S7-1500
View of the CM
①
LEDs for status and error displays
②
LED display of the Ethernet ports X1 P1 and X1 P2
③
Type plate
④
PROFINET interface: 2 x 8-pin RJ-45 jack
⑤
Label with MAC address
Figure 1 View of the CM 1542-1 with closed (left) and open (right) front cover

Preface
CM 1542-1
4Operating Instructions, 07/2019, C79000-G8976-C355-04
Address label: Unique MAC address preset for the CM
When supplied, the CM has a total of 3 default MAC addresses with the following
assignment:
●PROFINET interface
The MAC address of the PROFINET interface is printed on the housing.
(visible in STEP 7 if nodes are reachable)
●One MAC address for each of the 2 Ethernet ports of the PROFINET interface
The MAC addresses of the Ethernet ports are required only for detection and evaluation
of neighborhood and topology relations (LLDP).
Abbreviations and names
●CP
In this document, the term "CP" is also used instead of the full product name.
●STEP 7
The name STEP 7 is used to mean the STEP 7 Professional configuration tool.
Purpose of the manual
These Operating Instructions supplement the S7-1500 system manual.
With the information in this manual and the system manual, you will be able to commission
the CM.
New in this release
New ATEX/IECEx approval
Replaced edition
Edition 01/2017
Current manual release on the Internet
You will also find the current version of these operating instructions on the Internet pages of
Siemens Automation Customer Support
Link: (https://support.industry.siemens.com/cs/ww/en/ps/15341/man):

Preface
CM 1542-1
Operating Instructions, 07/2019, C79000-G8976-C355-04 5
Structure of the documentation
The following documents supplement these operating instructions for the CM 1542-1. You
will find links to the documents on the Internet in the appendix Documentation references
(Page 49).
Table 1 Documentation for the CM 1542-1
Topic
Documentation
Most important contents
System descrip-
tion
System manual: S7-1500 Automation System •Application planning
•Installation
•Connecting up
•Commissioning
Module properties Power supplies manual •Connecting up
•Parameter assign-
ment/addressing
•Interrupts, error messages,
diagnostics and system
alarms
•Technical specifications
•Dimension drawing
Signal modules manual
System diagnos-
tics
System diagnostics function manual •Overview
•Diagnostics evaluation for
hardware/software
Communication Communication function manual •Overview
Function manual PROFINET with STEP 7
Professional
•PROFINET basics
•PROFINET functions
•PROFINET diagnostics
Web Server function manual •Function
•Operation
Interference-free
installation of
control systems
Interference-free installation of control systems
function manual
•Basics
•Electromagnetic compatibil-
ity
•Lightning protection
•Housing selection
Memory concept Structure and Use of the CPU Memory function
manual
•Structure
•How it works
•Use
Cycle and re-
sponse times
Cycle and response times •Basics
•Calculations

Preface
CM 1542-1
6Operating Instructions, 07/2019, C79000-G8976-C355-04
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
The "Version History/Current Downloads for SIMATIC NET S7 CPs" provides information on
all CPs available up to now for SIMATIC S7 (Industrial Ethernet, PROFIBUS) and IE/PB
Link.
The current version of these documents can be found on the Internet at the following
address:
Link: (https://support.industry.siemens.com/cs/ww/en/view/109474421)
License conditions
Note
Open source software
The product contains open source software. Read the license conditions for op
en source
software carefully before using the product.
You will find license conditions in the following document on the supplied data medium:
●OSS_CM15421_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)

Preface
CM 1542-1
Operating Instructions, 07/2019, C79000-G8976-C355-04 7
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)
FAQs on the Internet
You will find detailed information (FAQs) on using the CM described here on the Internet at
the following address (entry type "FAQ"):
Link: (https://support.industry.siemens.com/cs/ww/en/ps/15341/faq)
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)
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)

Preface
CM 1542-1
8Operating Instructions, 07/2019, C79000-G8976-C355-04

CM 1542-1
Operating Instructions, 07/2019, C79000-G8976-C355-04 9
Table of contents
Preface ................................................................................................................................................... 3
1 Properties and functions........................................................................................................................ 11
1.1 Communication services.........................................................................................................11
1.2 Further functions .....................................................................................................................12
1.3 Configuration limits and performance data.............................................................................13
1.3.1 Transmission and reaction times ............................................................................................13
1.3.2 Connection resources .............................................................................................................13
1.3.3 Characteristic data Open User Communication incl. e-mail...................................................14
1.3.4 Characteristics of S7 communication .....................................................................................15
1.3.5 PROFINET IO characteristic data...........................................................................................16
1.3.6 Rack components ...................................................................................................................16
1.4 Requirements for use..............................................................................................................17
1.4.1 Project engineering .................................................................................................................17
1.4.2 Programming ..........................................................................................................................18
2 LEDs..................................................................................................................................................... 19
3 Installation, connecting up, commissioning, operation ........................................................................... 21
3.1 Important notes on using the device.......................................................................................21
3.1.1 Notices on use in hazardous areas ........................................................................................21
3.1.2 Notices on use in hazardous areas according to ATEX / IECEx............................................22
3.1.3 Notices regarding use in hazardous areas according to UL HazLoc .....................................23
3.1.4 Notices on use in hazardous areas according to FM .............................................................23
3.2 Installing and commissioning the CM 1542-1.........................................................................24
3.3 Terminal assignment...............................................................................................................25
3.4 Mode of the CPU - effect on the CM.......................................................................................25
4 Configuration, programming .................................................................................................................. 27
4.1 Security recommendations .....................................................................................................27
4.2 Network settings .....................................................................................................................30
4.2.1 Fast Ethernet ..........................................................................................................................30
4.3 IP configuration .......................................................................................................................30
4.3.1 Points to note about IP configuration......................................................................................30
4.3.2 Restart after detection of a duplicate IP address in the network ............................................31
4.3.3 Remove retentive storage of the IP address if there are duplicate addresses.......................31
4.3.4 IP routing.................................................................................................................................31
4.3.5 CM in multiple use IO systems (standard machines) .............................................................32
4.4 Media redundancy ..................................................................................................................33
4.5 Time-of-day synchronization...................................................................................................33
4.6 Program blocks for OUC.........................................................................................................34

Table of contents
CM 1542-1
10 Operating Instructions, 07/2019, C79000-G8976-C355-04
5 Diagnostics and upkeep........................................................................................................................ 37
5.1 Diagnostics options ................................................................................................................ 37
5.2 SNMP..................................................................................................................................... 37
5.3 Replacing a module without a programming device.............................................................. 39
6 Technical specifications ........................................................................................................................ 41
7 Approvals ............................................................................................................................................. 43
A Documentation references .................................................................................................................... 49
Index .................................................................................................................................................... 53

CM 1542-1
Operating Instructions, 07/2019, C79000-G8976-C355-04 11
Properties and functions
1
1.1 Communication services
The CM supports the following communications services:
●PROFINET IO
PROFINET IO allows direct access to IO devices over Industrial Ethernet.
–Real-Time communication (RT)
–Isochronous Real-Time communication (IRT)
–Media redundancy MRP
–Device replacement without exchangeable storage medium
–IO controller
–IO device (iDevice, Shared Device, Prioritized startup)
–Isochronous real time
●Open User Communication
Open User Communication supports the following communications services via the CM
using programmed or configured communications connections:
–TCP (complying with RFC 793), ISO-on-TCP (complying with RFC 1006) and UDP
(complying with RFC 768)
With the interface via TCP connections, the CM supports the socket interface to
TCP/IP available on practically every end system.
–Multicast with UDP
The multicast mode is made possible by selecting a suitable IP address when
configuring connections. A maximum of six multicast groups are supported via UDP.
●S7 communication
–PG communication
–Operator control and monitoring functions (HMI communication)
–Data exchange over S7 connections

Properties and functions
1.2 Further functions
CM 1542-1
12 Operating Instructions, 07/2019, C79000-G8976-C355-04
1.2 Further functions
Timeofday synchronization over Industrial Ethernet using the NTP mode (NTP: Network Time
Protocol)
The CM sends timeofday queries at regular intervals to an NTP server and synchronizes its
local time of day.
The time is also be forwarded automatically to the CPU modules in the S7 station allowing
the time to be synchronized in the entire S7 station.
Media redundancy (MRP)
Within an Ethernet network with a ring topology, the CM supports the media redundancy
protocol MRP. You can assign the role of "Client" or "Manager (Auto)" to the CM.
Addressable with the factoryset MAC address
To assign the IP address to a new CM (direct from the factory), it can be accessed using the
preset MAC address on the interface being used. Online address assignment is made in
STEP 7.
SNMP agent
The CM supports data queries using SNMP in version V1 (Simple Network Management
Protocol).
For details, see section SNMP (Page 37).
IP configuration - IPv4
The essential features of IP configuration for the CM:
●The CM supports the use of IP addresses according to IPv4.
●You can configure how and with which method the CM is assigned the IP address, the
subnet mask and the address of a gateway.
●The IP configuration and the connection configuration (IPv4) can also be assigned to the
CM by the user program (for program blocks refer to the section Programming
(Page 18)).
Note: Does not apply to S7 connections.
IP routing
The CM supports static IP routing (IPv4) to other CM 1542-1 V2.0 / CP 1543-1 V2.0 in an
S7-1500 system.
For details, see section IP routing (Page 31).

Properties and functions
1.3 Configuration limits and performance data
CM 1542-1
Operating Instructions, 07/2019, C79000-G8976-C355-04 13
Access to the Web server of the CPU
Via the LAN interface of the CM, you have access to the Web server of the CPU. With the
aid of the Web server of the CPU, you can read out module data from a station.
Note the special description of the Web server; refer to the section Documentation
references (Page 49)
Note
Web server access using the HTTPS protocol
The Web server of a SIMATIC S7
-1500 station is located in the CPU. For this reason, when
there is secure ac
cess (HTTPS) to the Web server of the station using the IP address of the
CM 1542
-1, the SSL certificate of the CPU is displayed.
1.3 Configuration limits and performance data
1.3.1 Transmission and reaction times
Measured values on the Internet
Note
Measured
values of transmission and reaction times in PROFINET networks for a series of
configurations can be found on the Internet at the following address:
Link: (
https://support.industry.siemens.com/cs/ww/en/view/25209605)
1.3.2 Connection resources
Characteristic
Explanation / values
Total number of freely usable connec-
tions on Industrial Ethernet
64 configurable connections, 1 PG connection
The value applies to the total number of connections of the
following types:
•Connections for open communications services

Properties and functions
1.3 Configuration limits and performance data
CM 1542-1
14 Operating Instructions, 07/2019, C79000-G8976-C355-04
Note
Connection resources CPU dependent
Depending on the CPU type, different numbers of connection resources are available. The
number of connect
ion resources is the decisive factor for the number of configurable
connections. This mea
ns that the values that can actually be achieved may be lower than
specified in this section "Properties and functions" describing the CM.
1.3.3 Characteristic data Open User Communication incl. e-mail
Open User Communication (OUC) provides access to communication over TCP, ISO-on-
TCP and UDP connections.
Characteristic
Explanation / values
Number of connections •Max. number of connections in total (configured and programmed:
(ISO-on-TCP + TCP + UDP + e-Mail) ≤64
of which:
–TCP connections: 0 ... 64 1)
–ISO-on-TCP connections: 0 ... 64
–Total number of UDP connections (specified and free) that can be
configured: 0 ... 64
–Connection for e.mail: 0 ... 64;
only one e-mail can be processed at any one time
Notes:
•1) Avoid overload at receiving end
The flow control on TCP connections cannot control permanent over-
load of the recipient. You should therefore make sure that the pro-
cessing capabilities of a receiving CM are not permanently exceeded
by the sender (approximately 150 200 messages per second).
Maximum data length for program blocks Program blocks allow the transfer of user data in the following lengths:
1. ISO-on-TCP, TCP: 1 - 64 kbytes
2. UDP: 1 - 1452 bytes
3. E-mail (job header + user data): 1 - 256 bytes
e-mail attachment: ≤64 kbytes
LAN interface max. data field length generat-
ed by the CM per protocol data unit(TPDU =
transport protocol data unit)
•For sending
–ISO-on-TCP, TCP: 1452 bytes / TPDU
•For receiving
–ISO-on-TCP: 512 bytes / TPDU
–TCP: 1452 bytes / TPDU

Properties and functions
1.3 Configuration limits and performance data
CM 1542-1
Operating Instructions, 07/2019, C79000-G8976-C355-04 15
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. This means that the values that can actually be achieved may be lower
than
specified in this section describing the CM.
You will find detailed information
on the topic of connection resources in the function manual
/4/
(Page 50).
Restrictions for UDP
●Restrictions UDP broadcast / multicast
To avoid overloading the CP due to high broadcast / multicast frame traffic, the receipt of
UDP broadcast / multicast on the CP is limited
●UDP frame buffering
Length of the frame buffer: At least 7360 bytes
Following a buffer overflow, newly arriving frames that are not fetched by the user
program are discarded.
1.3.4 Characteristics of S7 communication
S7 communication provides data transfer via the ISO-on-TCP protocol.
Characteristic
Explanation / values
Total number of freely usable S7 connections on
Industrial Ethernet
Max. 64
LAN interface - data field length generated by CM
per protocol data unit (PDU = protocol data unit)
•for sending: 480 bytes / PDU
•for receiving: 480 bytes / PDU
Note
Maximum values for an S7-1500 station
Depending on the CPU you are using, there are li
mit values for the S7-
1500 station. Note the
information in the relevant documentation.

Properties and functions
1.3 Configuration limits and performance data
CM 1542-1
16 Operating Instructions, 07/2019, C79000-G8976-C355-04
1.3.5 PROFINET IO characteristic data
Configuration limits of the CM as an IO controller
The CM supports the following maximum configuration as a PROFINET IO controller:
Characteristic
Explanation / values
Number of operable PROFINET IO devices 128, of which:
•Max. 64 IRT devices
Size of the input area over all PROFINET IO devices *)
Max. 8192 bytes
Size of the output area over all PROFINET IO devices
Max. 8192 bytes
Size of the IO data area per submodule of a module in an IO
device
•Inputs: 256 bytes
•Outputs: 256 bytes
Size of the consistency area for a submodule
256 bytes
*) The diagnostics addresses of the PROFINET IO devices cannot be used as an input on the IO controller. The data area
of the inputs is reduced by the diagnostics addresses used.
1.3.6 Rack components
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.
By operating several CMs, you can increase the configuration limits listed in the section
Properties and functions (Page 11) for the station as the whole. The CPU does, however,
have set limits for the entire configuration.
Note the information in the documentation of the CPU, refer to the section Documentation
references (Page 49)
Note
Power supply via the CPU adequate or additional power supply modules required
You can operate a certain number of modules in the S7
-1500 station without an
additional power supply. Make sure that you keep to the specified power feed to the
backplane b
us for the particular CPU type. Depending on the configuration of the S7-
1500 station you may need to provide additional power supply modules.

Properties and functions
1.4 Requirements for use
CM 1542-1
Operating Instructions, 07/2019, C79000-G8976-C355-04 17
1.4 Requirements for use
1.4.1 Project engineering
Software for configuration and online functions
To configure the CP, the following configuration tool is required:
STEP 7 version
Functions of the CM
STEP 7 Professional V13
Most functions of the CM can be configured.
STEP 7 Professional V14 The full functionality of the CM can be configured
with the new functions of the firmware version
according to Preface (Page 3).
Downloading the configuration data
When there is a download to the CPU, the CM is supplied with the relevant configuration
data. The configuration data can be downloaded to the CPU via a memory card or any
Ethernet/PROFINET interface of the S7-1500 station.

Properties and functions
1.4 Requirements for use
CM 1542-1
18 Operating Instructions, 07/2019, C79000-G8976-C355-04
1.4.2 Programming
Program blocks
For communications services, there are preprogrammed program blocks (instructions)
available as the interface in your STEP 7 user program.
Table 1- 1 Instructions for communications services
Protocol
Program block (instruction)
System data type
TCP Establish connection and
send/receive data via:
•TSEND_C / TRCV_C
or
•TCON, TSEND / TRCV
(Termination of the connec-
tion possible using
TDISCON)
•TCON_IP_v4
•TCON_Configured
•TCON_QDN
ISO-on-TCP •TCON_IP_RFC
UDP •TCON, TUSEND/TURCV
(Termination of the connec-
tion possible using
TDISCON)
•TCON_IP_v4
•TCON_QDN
E-mail •TMAIL_C •TMail_V4
•TMAIL_FQDN
Table 1- 2 Instructions for configuration tasks
Function
Program block (instruction)
System data type
Configuration of the Ethernet
interface
•T_CONFIG •CONF_DATA
For more detailed information, refer to section Program blocks for OUC (Page 34).
Refer to the documentation of the program blocks in the online help of STEP 7.

CM 1542-1
Operating Instructions, 07/2019, C79000-G8976-C355-04 19
LEDs
2
①
RUN/STOP
②
ERROR
③
MAINT
④
X1 P1 LINK/ACT
⑤
X1 P2 LINK/ACT
Figure 2-1 LED display of the CM 1542-1 (without front cover)
Meaning of the LED displays
The CM 1542-1 has 3 LEDs to display the current operating status and the diagnostics
status and these have the following meanings:
●RUN/STOP (single color green)
●ERROR (single color red)
●MAINT (single color yellow)
The following table shows the meaning of the various combinations of colors of the RUN,
ERROR and MAINT LEDs.
Table 2- 1 Meaning of the LEDs
RUN/STOP
ERROR
MAINT
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

LEDs
CM 1542-1
20 Operating Instructions, 07/2019, C79000-G8976-C355-04
RUN/STOP
ERROR
MAINT
Meaning
LED lit green
LED lit red
LED off
CM startup
LED lit green LED off LED off
CM is in RUN mode. No disrup-
tions.
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
•Downloading the user program
LED lit green
LED flashing red
- Duplicate IP address detected.
Ethernet interface unreachable.
LED flashing green
LED off LED off
•No CM configuration exists
•Loading firmware
LED flashing green
LED flashing red
LED flashing yellow
Module fault
(LEDs flashing synchronized)
Meaning of the LED displays of the PROFINET ports: X1 P1 / X1 P2
To signal whether a connection exists and data is being transferred each port has a two-
color LED (green/yellow):
●X1 P1 LINK/ACT
●X1 P2 LINK/ACT
The following table shows the meaning of the various color combinations of the LEDs X1 P1
and X1 P2.
Table 2- 2 Meaning of the LEDs
X1 P1 LINK/ACT /
X1 P2 LINK/ACT
Meaning
green off yellow off
No connection to PROFINET
There is no Ethernet connection between the Ethernet
interface of the CM and the communications partner. At
the current time, there is no data being received/sent via
the Ethernet interface.
flashing green
yellow off
The "node flash test" is being performed.
green on yellow off
Connection to PROFINET exists
There is an Ethernet connection between the Ethernet
interface of the CM and a communications partner.
green on yellow flickers
At the current time, data is being received/sent via the
Ethernet interface of the Ethernet device of a communica-
tions partner on Ethernet.