6GK7242-5DX30-0XE0 Siemens CM 12425

 245.83 351.67

  • 6GK7242-5DX30-0XE0
  • SIMATIC S7-1200
  • Communication module CM 1242-5
  • for the connection of Simatic S7-1200 to Profibus as DP slave module

Siemens CM 1242-5 – 6GK7242-5DX30-0XE0


The CM 1242-5 communication module is used to connect a SIMATIC S7-1200 to PROFIBUS as a DP slave and has the following characteristics:

  • PROFIBUS DPV1 slave in accordance with IEC 61158
  • Module replacement without PG supported
  • Power is supplied via the backplane bus so that no extra cabling is required
  • Support of all standard baud rates from 9.6 kbps to 12 Mbps
  • Compact industry-standard enclosure in S7-1200 design for mounting on a DIN rail
  • Fast commissioning thanks to easy configuration using STEP 7 without additional programming overhead

The CM 1242-5 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 comprehensive diagnostics options
  • Optimized plant and inventory management

The CM 1242-5 also offers further benefits especially for the requirements of micro-automation solutions:

  • Straightforward connection of the SIMATIC S7-1200 to PROFIBUS without an extra power supply
  • Low-cost implementation of automation solutions based on PROFIBUS
  • Fast commissioning, as no programming overhead is required


The CM 1242-5 is designed for use in factory automation.

With the CM 1242-5, 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


The CM 1242-5 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

The CM 1242-5 is plugged into the left-hand system bus interface of the S7-1200. Power is supplied via the system bus of the S7-1200 so that no extra cabling is required. The rugged RS485 interface is located on the underside of the module, protected by the lower front flap.


The CM 1242-5 provides the communication services for integrating an S7-1200 into an automation solution as a PROFIBUS DP slave.


The CM 1242-5 works as a DPV1 slave 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.


Extensive diagnostic options are available via STEP 7, including

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

STEP 7 Basic V11 or higher is required for configuring the full functional scope of the CP 1242-5.

Technical specifications


Communication module CM 1242-5; for connection of SIMATIC S7-1200 to PROFIBUS as DP Slave module


DataSheet in PDF

Weight 0.172 kg
Dimensions 1.00 × 1.00 × 1.00 mm


product type designation

CM 1242-5

transfer rate

number of interfaces / acc. to Industrial Ethernet


number of electrical connections

● for power supply


type of electrical connection

● at the 1st interface / acc. to PROFIBUS

9-pin Sub-D socket (RS485)

type of voltage / of the supply voltage


supply voltage / 1 / from backplane bus

5 V

consumed current

● from backplane bus / at DC / at 5 V / typical

0.15 A

power loss [W]

0.75 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 slave

● DPV0


● DPV1


data volume

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

240 byte

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

240 byte

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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