Siemens Industry Online Support
Siemens AG
Entry type: Product note Entry ID: 109775640, Entry date: 01/23/2020

Sales release and download of firmware 3.2 for CP 1242-7V2, CP 1243-7 LTE, CP 1243-1, CP 1243-8 IRC

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Sales release and download of firmware 3.2 for CP 1242-7V2, CP 1243-7 LTE, CP 1243-1, CP 1243-8 IRC


Firmware version 3.2 for the following S7-1200 communication modules is available for download:

  • CP 1242-7 GPRS V2 (6GK7242-7KX31-0XE0)
  • CP 1243-7 LTE EU   (6GK7243-7KX30-0XE0)
  • CP 1243-7 LTE US    (6GK7243-7SX30-0XE0)
  • CP 1243-1                  (6GK7243-1BX30-0XE0)
  • CP 1243-8 IRC          (6GK7243-8RX30-0XE0)

The firmware contains general improvements to the product quality and serves to upgrade existing devices of the above-mentioned products.

In particular, the firmware contains the following changes:

New features:

  • Increase in the number of data points
    (CP 1243-8 IRC, CP 1243-1)
    The maximum number of configurable data points was increased from 200 DP to 500 DP. This concerns the telecontrol protocols ST7, DNP3 and IEC 60870-5-104
  • Direct communications between telecontrol stations
    (CP 1243-8 IRC, CP 1243-1)
    The telecontrol modules now support direct communication (peer to peer) between DNP3 or IEC stations
  • Connection to disaster recovery server with the same DNP3 address
    (CP 1243-8 IRC, CP 1243-1)
    In the telecontrol protocol DNP3, the module supports the connection to a second redundant master system with the same DNP3 address that is operated as a disaster recovery server. 
  • Open User Communication
    For Open User Communication the corresponding modules can now be used for secure communication (secure OUC) and FQDN-based addressing.


Security fixes:

  • Correction for SSA-462066: Vulnerability known as TCP SACK PANIC in Industrial Products

Step7 V16 and higher (TIA Portal) is to be used for configuration of the modules with firmware 3.2.

The firmware is exclusively compatible with devices of the above-mentioned products, which have hardware version 2.

Please see the notes regarding a patch required for the Telecontrol configuration with DNP3 and IEC 60870 in SIMATIC STEP7 Professional / Basic V16: 109773688 


Third-party software – license conditions and copyright notes

You can find the copyright information for the third-party software contained in this product, particularly open source software, as well as applicable license conditions of such third-party software in the ReadMe_OSS file.          The source code of GPL licensed OSS is found in the download of the corresponding firmware. 

Special note for resellers

The information and the license conditions in the Readme_OSS file must be passed on to the purchasing party to avoid license infringements by the reseller or purchasing party.

  OSS_CP124x7_99.pdf (8.9 MB) 

  OSS_CP1243x_99.pdf (8.3 MB)



You can download the files  here:

 Registrierung notwendig  6GK7242-7KX31-0XE0_V03.02.24_OSS.zip (69.7 MB) 

 Registrierung notwendig  6GK7243-1BX30-0XE0_V03.02.24_OSS.zip (69.2 MB)

 Registrierung notwendig  6GK7243-7KX30-0XE0_V03.02.24_OSS.zip (69.7 MB)

 Registrierung notwendig  6GK7243-7SX30-0XE0_V03.02.24_OSS.zip (69.7 MB)

 Registrierung notwendig  6GK7243-8RX30-0XE0_V03.02.24_OSS.zip (69.2 MB)



Procedure for updating the CP firmware:

You can either install the firmware update via the STEP 7 online diagnostics functions, or create a SIMATIC memory card from the Siemens customer support website from which you can download the firmware update. This process is described in the S7-1200 system manual.

If you use a SIMATIC memory card for the installation of the firmware update, the retentive memory is retained. However, if you use the web server or the STEP 7 online diagnostics functions for the installation of the update, the retentive memory is lost.

Security information
In order to protect technical infrastructures, systems, machines and networks against cyber threats, it is necessary to implement – and continuously maintain – a holistic, state-of-the-art IT security concept. Siemens’ products and solutions constitute one element of such a concept. For more information about cyber security, please visit
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