Siemens SIMATIC NET S7-1200 User manual

SIMATIC CM 1243-5
SIMATIC NET
S7-1200 - PROFIBUS
SIMATIC CM 1243
-5
Operating Instructions
01/2023
C79000
-G8976-C246-06
Preface
Application and properties
1
LEDs and connectors
2
Installation, connecting up,
commissioning
3
Configuration and program
blocks
4
Diagnostics and upkeep
5
Technical specifications
6
Dimension drawings
A
Approvals
B
References
C

Siemens AG
Digital Industries
Postfach 48 48
90026 NÜRNBERG
GERMANY
C79000-G8976-C246-06
Ⓟ
01/2023 Subject to change
Copyright © Siemens AG 2011 - 2023.
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.

SIMATIC CM 1243-5
Operating Instructions, 01/2023, C79000-G8976-C246-06 3
Preface
Validity of this manual
This document contains information on the following product:
CM 1243-5
Article number 6GK7 243-5DX30-0XE0
Hardware version 3
Firmware version V1.3.8
Communications module for connection of the SIMATIC S7-1200 to PROFIBUS (DP master
module)
Communications module for the PROFIBUS DP master function for the SIMATIC S7-1200.
Figure 1 CM 1243-5
At the top right behind the hinged cover of the module housing, you will see the hardware
product version printed as a placeholder "X". If the printed text is "X 2 3 4", "X" would be the
placeholder for hardware product version 1.
Product name
•CM
In this document, the term "CM" is used instead of the full product name "CM 1243-5".

Preface
SIMATIC CM 1243-5
4Operating Instructions, 01/2023, C79000-G8976-C246-06
New in this edition
•New firmware version with the following new functions, among others, compared to
version V1.3.4:
Functional improvement in use together with ET200pro and PROFIBUS DPV0 slaves with
increased volume of diagnostic messages
•New approvals (CCC / UKEX)
•Editorial revision
Replaced manual edition
Edition 06/2017
Current manual edition on the Internet
You can 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/view/49851842)
Purpose of the manual
This manual describes the properties of this module and supports you when installing and
commissioning the device.
The necessary configuration steps are described in the form of an overview.
You will also find instructions for operation and maintenance and information on the
diagnostics options of the device.
Required experience
To install, commission and operate the CM, you require experience in the following areas:
•Automation engineering
•Setting up the SIMATIC S7-1200 system
•SIMATIC STEP 7
•Data transfer with PROFIBUS
Notes on this document
Product names
•CM / module / device
In this document, these terms are used instead of the complete product designation
CP 1243-1.

Preface
SIMATIC CM 1243-5
Operating Instructions, 01/2023, C79000-G8976-C246-06 5
Cross-references in the PDF
In this manual, there are often cross-references to other sections. To be able to return to the
initial page after jumping to a cross-reference, some PDF readers support the command
<Alt>+<left arrow>.
Search
To show all places where a term was found in a list, some PDF readers support the command
<Ctrl>+<Shift>+<F>.
License conditions
Note
Open source software
Read the license conditions for open source software carefully before using the product. The
acceptance of the disclaimers of liability and warranty it contains is a clear precondition of
the use of open source software.
You will find license conditions in
the document "OSS_CM12435_86.pdf" on the data
medium supplied with the product documentation.
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: (https://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: (https://www.siemens.com/cert)

Preface
SIMATIC CM 1243-5
6Operating Instructions, 01/2023, C79000-G8976-C246-06
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.
•Restrict physical access to the device to qualified personnel.
•Configure a protection level of the CPU.
Firmware
The firmware is signed and encrypted. This ensures that only firmware created by Siemens
can be downloaded to the device.
Note on firmware/software support
Check regularly for new firmware/software versions or security updates and apply them. After
the release of a new version, previous versions are no longer supported and are not
maintained.
Device defective
If a fault develops, please send the device to your Siemens representative for repair. Repairs
on-site are not possible.
Decommissioning
Shut down the device properly to prevent unauthorized persons from accessing confidential
data in the device memory.
To do this, restore the factory settings on the device.
You achieve this by resetting the CPU using the online functions of STEP 7.
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
SIMATIC CM 1243-5
Operating Instructions, 01/2023, C79000-G8976-C246-06 7
SIMATIC NET glossary
The SIMATIC NET glossary describes terms that may be used in this document.
You will find the SIMATIC NET glossary in the Siemens Industry Online Support at the
following address:
Link: (https://support.industry.siemens.com/cs/ww/en/view/50305045)
Training, Service & Support
You will find information on Training, Service & Support in the multi--language document
"DC_support_99.pdf" on the data medium supplied with the documentation.

Preface
SIMATIC CM 1243-5
8Operating Instructions, 01/2023, C79000-G8976-C246-06

SIMATIC CM 1243-5
Operating Instructions, 01/2023, C79000-G8976-C246-06 9
Table of contents
Preface ................................................................................................................................................... 3
1 Application and properties .................................................................................................................. 11
1.1 Connecting the S7-1200 to PROFIBUS ................................................................................ 11
1.2 Communications services of the CM................................................................................... 11
1.3 Performance data .............................................................................................................. 13
1.4 Requirements for operation ............................................................................................... 15
1.5 Configuration examples for PROFIBUS ................................................................................ 16
2 LEDs and connectors............................................................................................................................ 17
2.1 Opening the covers of the housing..................................................................................... 17
2.2 LEDs .................................................................................................................................. 18
2.3 Electrical connections ........................................................................................................ 21
3 Installation, connecting up, commissioning ....................................................................................... 23
3.1 Important notes on using the device .................................................................................. 23
3.1.1 Notes on use in hazardous areas ........................................................................................ 23
3.1.2 Notes on use in hazardous areas according to ATEX / UKEX / IECEx / CCC-Ex ........................ 23
3.1.3 Notes on use in hazardous areas according to UL HazLoc and FM........................................ 24
3.2 Installation, removal and repairs in hazardous areas ........................................................... 25
3.3 Installing, connecting and commissioning.......................................................................... 26
3.4 Note on operation ............................................................................................................. 30
3.5 Disassembly....................................................................................................................... 31
4 Configuration and program blocks...................................................................................................... 33
4.1 Configuration .................................................................................................................... 33
4.2 Program blocks .................................................................................................................. 34
5 Diagnostics and upkeep ...................................................................................................................... 37
5.1 Diagnostics........................................................................................................................ 37
5.2 Maintenance ..................................................................................................................... 38
5.2.1 Downloading firmware ...................................................................................................... 38
5.2.2 Module replacement.......................................................................................................... 39
6 Technical specifications....................................................................................................................... 41
6.1 Technical specifications of the CM 1243-5.......................................................................... 41
6.2 Pin assignment of the socket for the external power supply................................................ 42
6.3 Pinout of the D-sub socket ................................................................................................. 43
A Dimension drawings............................................................................................................................ 45

Table of contents
SIMATIC CM 1243-5
10 Operating Instructions, 01/2023, C79000-G8976-C246-06
B Approvals............................................................................................................................................. 47
C References ........................................................................................................................................... 53
Index.................................................................................................................................................... 55

SIMATIC CM 1243-5
Operating Instructions, 01/2023, C79000-G8976-C246-06 11
Application and properties
1
1.1 Connecting the S7-1200 to PROFIBUS
Connecting the S7-1200 to PROFIBUS DP
The S7-1200 can be connected to a PROFIBUS fieldbus system with the following
communications modules:
•CM 1242-5
Operates as DP slave
•CM 1243-5
Operates as DP master class 1
If a CM 1242-5 and a CM 1243-5 are installed together, an S7-1200 can perform the
following tasks simultaneously:
•Slave of a higher-level DP master system
and
•Master of a lower-level DP master system
1.2 Communications services of the CM
Bus protocol
PROFIBUS communication with the S7-1200 CMs is based on the PROFIBUS DP-V1 protocol.
The supported functions and restrictions are described below.
Possible DP slaves for the DP master CM 1243-5
With the DP master module CM 1243-5, the S7-1200 can communicate with the following
DP-V0/V1 slaves:
•Distributed I/O SIMATIC ET200
•S7-1200 CPUs with CM 1242-5
•S7-200 CPUs with PROFIBUS DP module EM 277
•SINAMICS converter
•Drives and actuators from various vendors
•Sensors of various vendors
•S7-300/400 CPU with PROFIBUS interface

Application and properties
1.2 Communications services of the CM
SIMATIC CM 1243-5
12 Operating Instructions, 01/2023, C79000-G8976-C246-06
•S7-300/400 with PROFIBUS CP (for example CP 342-5)
•SIMATIC PC stations with PROFIBUS CP
Types of communication with the CM 1243-5 in DP-V1
The following types of communication are available with DP-V1:
•Cyclic communication
The CM supports cyclic communication for the transfer of process data between DP slave
and DP master.
Cyclic communication is handled by the operating system of the CPU. No instructions or
software blocks are required for this. The I/O data is read or written directly from/to the
process image of the CPU.
•Acyclic communication
The CM also supports acyclic communication:
–The "RALRM" instruction is available for receiving interrupts of the DP slaves.
–The "RDREC" and "WRREC" instructions are available for transferring configuration,
diagnostics or I/O data.
Functions not supported by the CM 1243-5:
•SYNC / FREEZE
•Get_Master_Diag
Other communications services of the CM 1243-5
The CM 1243-5 supports the following additional communications services:
•S7 communication
–PUT/GET services
The DP master functions as a client and server for queries from other S7 controllers or
PCs via PROFIBUS.
–PG/OP communication
The PG functions allow the downloading of configuration data and user programs from
a PG and the transfer of diagnostics data to a PG.
Possible communications partners for OP communication are HMI panels, SIMATIC
panel PCs with WinCC flexible or SCADA systems that support S7 communication.

Application and properties
1.3 Performance data
SIMATIC CM 1243-5
Operating Instructions, 01/2023, C79000-G8976-C246-06 13
1.3 Performance data
Number of CPs/CMs that can be plugged in per S7-1200 station
You can configure a maximum of three CMs/CPs per station. The maximum number of DP
master modules depends on the firmware version of the CPU in the master station:
•CM 1243-5 + CPU with firmware version V2.x: Maximum of 1 DP master (CM 1243-5)
•CM 1243-5 + CPU with firmware version V3.x: Maximum of 3 DP masters (CM 1243-5)
Transmission speeds of the CM 1243-5
As the transmission speed on PROFIBUS, values of 9.6 kbps to 12 Mbps are permitted for the
CM.
Characteristic data of the DP interface of the CM 1243-5
•Number of operable DP slaves
The number of DP slaves that can be operated with the DP master depends on the STEP 7
version, the firmware version of the CPU in the master station and the firmware version of
the CM 1243-5:
–CM with a CPU with firmware V3: Maximum of 32 DP slaves
–CM with a CPU with firmware V2: Maximum of 16 DP slaves
You will find the required STEP 7 version and firmware version of the CPU in the section
Requirements for operation (Page 15).
In conjunction with a CPU with firmware version 2.x, the maximum number of operable
DP slaves is reduced by the following modules or nodes:
–CM 1242-5 slave modules plugged into the station of the DP Master
–PROFINET IO devices connected to the station of the DP Master
Example
The DP master module CM 1243-5 is plugged into the station.
There are also two CM 1242-5 DP slave modules plugged into the station.
5 PROFINET IO devices are also connected to the CPU.
In this case, the maximum number of DP slaves that can be operated with the
CM 1243-5 is 9. (16 -2 -5 = 9)
•Number of operable slots
Total number of operable slots: Maximum 256
Any distribution of the slots as I slots and Q slots is permitted.
Note
Bi
-directional slots are counted double.

Application and properties
1.3 Performance data
SIMATIC CM 1243-5
14 Operating Instructions, 01/2023, C79000-G8976-C246-06
•Data areas of the DP master
Size of the DP data areas of the DP master: Max. 1024 bytes
–Input area of the DP master in total: Max. 512 bytes
–Output area of the DP master in total: Max. 512 bytes
•Data areas of the DP slaves
Maximum size of the DP data areas of the DP slaves
–Input area per DP slave: Max. 244 bytes
–Output area per DP slave: Max. 244 bytes
–Diagnostics data area per DP slave: Max. 244 bytes
Characteristic data of S7 communication
•Number of possible connections for S7 communication in total: 8
Of which maximum:
–Configured connections for PUT/GET services: 6
–PG/OP connections: 3
•User data per frame
–PUT: Max. 209 bytes
–GET: Max. 222 bytes

Application and properties
1.4 Requirements for operation
SIMATIC CM 1243-5
Operating Instructions, 01/2023, C79000-G8976-C246-06 15
1.4 Requirements for operation
Configuration tool
To configure the module, the following configuration tool is required:
•STEP 7 Basic
For the precise version, refer to the following table.
CPUs of the S7-1200
Use of PROFIBUS functionalities with the S7-1200 requires CPUs with firmware versions 2.0 or
higher in the master station. For the precise version, refer to the following table.
Supported functions depending on the firmware and STEP 7 versions
Required components
Functions and configuration limits *
•CM: Firmware version V1.3.3
•CPU: Firmware version V3.0 or V4.x
•STEP 7 V13
All functions and the full configuration limits
are supported.
•CM: Firmware version V1.3.4
•CPU: Firmware version V3.0 or V4.x
•STEP 7 V13 + SP1
The CM remains configurable with STEP 7 V13.
All functions and the full configuration limits
are supported.
When configuring with STEP 7 V13 + SP1
operation of the CM in projects with ET 200S HF
is supported.
•CM: Firmware version V1.3.8
•CPU: Firmware version V3.0 or V4.x
•STEP 7 V13 or higher
All functions and the full configuration limits
are supported.
* You will find the configuration limits in the section Performance data (Page 13).
The CM should always be operated with the current firmware version. For information on
loading newer firmware versions and the firmware files to be used, refer to the section
Downloading firmware (Page 38).

Application and properties
1.5 Configuration examples for PROFIBUS
SIMATIC CM 1243-5
16 Operating Instructions, 01/2023, C79000-G8976-C246-06
1.5 Configuration examples for PROFIBUS
Below, you will find examples of configurations in which the CM 1242-5 is used as a DP slave
and the CM 1243-5 is used as a DP master.
Figure 1-1 Configuration example with a CM 1242-5 as PROFIBUS slave
Figure 1-2 Configuration example with a CM 1243-5 as PROFIBUS master

SIMATIC CM 1243-5
Operating Instructions, 01/2023, C79000-G8976-C246-06 17
LEDs and connectors
2
2.1 Opening the covers of the housing
Location of the display elements and the electrical connectors
The LEDs for the detailed display of the module statuses are located behind the upper cover
of the module housing.
The terminals for the power supply are located on the top of the module.
The PROFIBUS connector is located behind the lower cover of the module.
Opening the covers of the housing
Open the upper or lower cover of the housing by pulling it down or up as shown in the
illustration. The covers extend beyond the housing to give you a grip.
Figure 2-1 Opening the covers of the housing

LEDs and connectors
2.2 LEDs
SIMATIC CM 1243-5
18 Operating Instructions, 01/2023, C79000-G8976-C246-06
2.2 LEDs
LEDs of the module
The module has various LEDs for displaying the status:
•LED on the front panel
The "DIAG" LED that is always visible shows the basic statuses of the module.
Table 2- 1 LED on the front panel
LED / colors
Name
Meaning
red / green
DIAG
Display of the basic status of the module
•LEDs below the upper cover of the housing
Open the upper housing cover. The LEDs here provide more detailed information on the
module status.
Table 2- 2 LEDs below the upper cover of the housing
LED / colors
Name
Meaning
yellow / green
RUN/STOP
Details on the operational and communications status of the
module
red
ERROR
Group error
- not used -
-
- not used -
-
Note
LED colors when the module starts up
When the module starts up, all its LEDs are lit for a short time. Multicolored LEDs display a
color mixture. At this point in time, the color of the LEDs is not clear.
Display of the operating and communication status
The LED symbols in the following tables have the following significance:
Table 2- 3 Meaning of the LED symbols
Symbol
-
LED status
OFF
ON (steady light)
Flashing, one color
Flashing yellow-
green
Not relevant

LEDs and connectors
2.2 LEDs
SIMATIC CM 1243-5
Operating Instructions, 01/2023, C79000-G8976-C246-06 19
The LEDs indicate the operating and communications status of the module according to the
following scheme:
Table 2- 4 Display of the basic states of the module by the "DIAG" LED
DIAG
(red / green)
Meaning Comment
Power OFF
green
RUN without errors
flashing green
•Startup
•STOP without errors
•No project data
•Firmware update
The individual states are signaled by the
RUN/STOP and ERROR LEDs (see below).
flashing red
Problem / error The individual states are signaled by the
RUN/STOP and ERROR LEDs (see below).

LEDs and connectors
2.2 LEDs
SIMATIC CM 1243-5
20 Operating Instructions, 01/2023, C79000-G8976-C246-06
Table 2- 5 Display schemes for detailed module statuses
DIAG
(red / green)
-
RUN/STOP
(yellow /
green)
ERROR
(red)
Meaning
Detailed status schemes
green
RUN without errors,
Exchange of user data with DP master
flashing green
•Stopped (STOP) without errors
•No project data available
flashing green
Starting up (STOP →RUN)
flashing green
Loading firmware
(The RUN/STOP and ERROR LEDs flash alternately.)
flashing red
RUN with PROFIBUS problem:
•DP slave errors
•No master-slave connection
•PROFIBUS cable not connected or not detected
flashing red
System fault:
•CM has not received an address from the CPU
•Power supply of the CM was interrupted
•CPU reset to factory defaults
Solution when the error is permanent: Station
power →OFF →ON
Other possible problems:
•Module fault
•Incomplete firmware version
Contact the hotline.
In STOP mode, configuring and performing diagnostics on the CM remain possible.