Siemens Industry Online Support
Siemens AG
Entry type: Product note Entry ID: 109800773, Entry date: 07/27/2021

Delivery release of the firmware update V3.0 for CP 1543-1.

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The new firmware V3.0 for the product CP 1543-1 (6GK7543-1AX00-0XE0) has been released for delivery. The firmware is now available for download free of charge. The module is scheduled for delivery as of the end of October 2021 with the new firmware.


The CP 1543-1 can only be configured as a component of the SIMATIC S7-1500 system with STEP 7 Professional (TIA Portal) as of V12.

The CP 1543-1 V3.0 must be configured with STEP 7 Professional V17 (TIA Portal) for use of the new functions.


Firmware version V3.0 

Firmware V3.0 of the CP 1543‑1 contains new functions and product improvements concerning general operation of the module in the S7-1500 system. Therefore, performing an upgrade using a free firmware update is generally expedient and is recommended. 

New functions

  • Network authentication according to IEEE 802.1X using the EAP methods MD5, TLS, PEAP, TTLS, MSCHAPv2 or PWD.
  • Connection to SINEMA Remote Connect via OpenVPN.
  • Configurable CP diagnostics at runtime.
  • Disable buffering of UDP datagrams.


Security information

This version contains security-related improvements which improve ruggedness. An update is recommended.

Third-party software - license conditions and copyright information

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.

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_CP15431_99.pdf (7.6 MB)



You can download the file here.

 Registrierung notwendig  6GK7543-1AX00-0XE0_V03.00.17_OSS.zip (23.3 MB)(SHA-256)


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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