6GK7243-5DX30-0XE0 Siemens CM 12435

 360.00 576.67

  • 6GK7243-5DX30-0XE0
  • SIMATIC S7-1200
  • Communication module CM 1243-5
  • for the connection of Simatic S7-1200 to Profibus as DP master module
  • PG/OP communication
  • S7 communication

Siemens CM 1243-5 – 6GK7243-5DX30-0XE0


The CM 1243-5 communication module is used to connect a SIMATIC S7-1200 to PROFIBUS as a DP master and has the following characteristics:

  • PROFIBUS DPV1 master in accordance with IEC 61158
  • Support of up to 16 PROFIBUS DP slaves
  • Communication with other S7 controllers based on S7 communication
  • Allows programming devices and operator panels with PROFIBUS interfaces to be connected to the SIMATIC S7-1200
  • Module replacement without PG supported
  • Support of all standard baud rates from 9.6 kbps to 12 Mbps
  • Compact industrial enclosure in SIMATIC S7-1200 design for mounting on a DIN rail
  • Fast commissioning thanks to easy configuration using STEP 7 without additional programming overhead

The CM 1243-5 is intended for use in factory automation. Low-cost PROFIBUS-based automation solutions can be created on the basis of the SIMATIC S7-1200 for optimal production.


PROFIBUS-based systems can be operated effectively for lower operating and maintenance costs:

  • Low costs since an automation solution requires no fixed wiring and less hardware
  • Fast response to faults thanks to excellent diagnostics options
  • Optimized plant and inventory management

The CM 1243-5 also offers further benefits especially for the requirements of micro-automation solutions:

  • Straightforward connection of the SIMATIC S7-1200 to PROFIBUS
  • Low-cost implementation of automation solutions based on PROFIBUS
  • Fast commissioning, as no programming overhead is required

Use of PROFIBUS-based micro-automation solutions enables optimal operation of the plant and problem-free production.


The CM 1243-5 is designed for use in factory automation, particularly for mechanical engineering

With the CM 1243-5, low-cost, distributed automation solutions can be implemented on the basis of the SIMATIC S7-1200, or in simple cases even complete plant automation systems. It can be used in all sectors of discrete automation. These include, for example:

  • Automotive
  • Pharmaceuticals
  • Semiconductors
  • Food processing industry

In mechanical engineering, the SIMATIC S7-1200 can be used with the CM 1243-5 as a central control unit, with sensors, actuators or the HMI devices connected direct via PROFIBUS.

  • Pick-and-place machines
  • Metalworking machines
  • Packaging machinery
  • Printing machines
  • Textile machines
  • Filling machines


The CM 1243-5 offers all the benefits of the S7-1200 design.

  • Rugged, compact plastic enclosure
  • Easily accessible connection and diagnostics elements, protected by front flaps
  • Removable connecting terminals
  • Simple mounting on the mounting rail of the S7-1200
  • 9-pin sub-D socket for the bus interface to PROFIBUS
  • 3-pin plug-in terminal strip for connection of the 24 V DC external supply voltage

The CM 1243-5 is plugged into the left-hand system bus interface of the S7-1200. The power is supplied via a 3-pin terminal strip on top of the module. The rugged RS485 interface is located on the underside of the module, protected by the lower front flap.


The CM 1243-5 provides access to different communication services on the basis of PROFIBUS:

  • PROFIBUS DP (according to IEC 61158, master)
  • PG/OP communication
  • S7 communication


The CM 1243-5 works as a DP-V1 master in accordance with IEC 61158, handles data traffic completely autonomously, and thus relieves the CPU of communication tasks.

The data areas of the distributed I/Os are transferred consistently between CP and CPU. As a DP master, it allows the connection of up to 16 PROFIBUS-compliant DP slaves

PG/OP communication

The S7-1200 to which the CM 1243-5 is connected can be programmed with the help of PG/OP communication.

S7 communication

Communication with the following other systems can be implemented with the mechanisms familiar from the S7 world (Put/Get) on the basis of S7 communication:

  • To other SIMATIC S7 programmable controllers
  • To HMI devices
  • To PCs, laptops, field PGs with PROFIBUS cards


Extensive diagnostic options are available via STEP 7, including

  • Operating state of the CM
  • General diagnostics and statistics functions
  • Connection diagnostics
  • Message buffer

STEP 7 Basic V11 or higher is required for configuring the full functional scope of the CP 1243-5.

Technical specifications


Communication module CM 1243-5 for connection of SIMATIC S7-1200 to PROFIBUS as DP Master module; PG/OP communication; S7 communication


DataSheet in PDF

Weight 0.193 kg
Dimensions 1.00 × 1.00 × 1.00 mm


product type designation

CM 1243-5

transfer rate

number of interfaces / acc. to Industrial Ethernet


number of electrical connections

type of electrical connection

● at the 1st interface / acc. to PROFIBUS

9-pin Sub-D socket (RS485)

● for power supply

3-pole terminal block

type of voltage / of the supply voltage


supply voltage / external

24 V

supply voltage / external / at DC / rated value

24 V

relative positive tolerance / at DC / at 24 V

20 %

relative negative tolerance / at DC / at 24 V

20 %

consumed current

● from external supply voltage / at DC / at 24 V / typical

0.1 A

power loss [W]

2.4 W

ambient temperature

● for vertical installation / during operation

0 … 45 °C

● for horizontally arranged busbars / during operation

0 … 55 °C

● during storage

-40 … +70 °C

● during transport

-40 … +70 °C

relative humidity

● at 25 °C / without condensation / during operation / maximum

95 %

protection class IP


module format

Compact module S7-1200 single width

fastening method

● 35 mm top hat DIN rail mounting


● S7-300 rail mounting


● wall mounting


number of units

● per CPU / maximum


service / as DP master

number of DP slaves

● on DP master / operable


data volume

● of the address range of the inputs / as DP master / total

512 byte

● of the address range of the outputs / as DP master / total

512 byte

● of the address range of the inputs / per DP slave

244 byte

● of the address range of the outputs / per DP slave

244 byte

● of the address range of the diagnostic data / per DP slave

240 byte

service / as DP slave

● DPV0


● DPV1


number of possible connections / for S7 communication

● maximum

8; max. 4 connections to other S7 stations

● with PG connections / maximum


● with PG/OP connections / maximum


number of active connections / with multi-protocol mode

● without DP / maximum


● with DP / maximum


protocol / is supported



configuration software

● required

STEP 7 Basic/Professional

certificate of suitability / CCC / for hazardous zone according to GB standard


● to web page: selection aid TIA Selection Tool


● to website: Industrial communication


● to website: Industry Mall


● to website: Information and Download Center


● to website: Image database


● to website: CAx-Download-Manager


● to website: Industry Online Support


security information

Siemens provides products and solutions with industrial security functions that support the secure operation of plants, solutions, machines, equipment and/or networks. They are important components in a holistic industrial security concept. With this in mind, Siemens’ products and solutions undergo continuous development. Siemens recommends strongly that you regularly check for product updates. For the secure operation of Siemens products and solutions, it is necessary to take suitable preventive action(e.g. cell protection concept) and integrate each component into a holistic, state-of-the-art industrial security concept. Third-party products that may be in use should also be considered. For more information about industrial security, visit http://www.siemens.com/industrialsecurity. To stay informed about product updates as they occur, sign up for a product-specific newsletter. For more information, visit http://support.automation.siemens.com. (V3.4)

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