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Entry type: Download Entry ID: 109486101, Entry date: 05/02/2016
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Download for Firmware Update V3.1 of CP 343-1 (6GK7343-1EX30-0XE0)

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The new firmware V3.1 is released for the SIMATIC NET product CP 343-1 (6GK7343-1EX30-0XE0). Effective immediately, the modules will be delivered with the new firmware V3.1. The firmware is now available for download free of charge. Firmware V3.1 contains product improvements. Performing an upgrade using a free firmware update is generally expedient and is recommended.


The CPs with firmware version V2.4 and higher that are already in use can be upgraded with the update.

Effective immediately, the CP 343-1 (6GK7343-1EX30-0XE0) modules will be delivered with the new firmware V3.1. CPs that are already in use can be upgraded by means of a firmware update.

Registrierung notwendig CP3431EX30_V3p1p1_OSS.zip (2.4 MB)

Firmware version V3.1 is the successor to version V3.0 and includes product improvements.

1. Product improvements

  • SendReceive: Problem with active establishment of an ISOonTCP connection, whereby the connection partner does not send the optional parameters C0, C1 and C2, has been solved (internal ref.: ID 1198968).

  • ModbusTCP: When Modbus client frames <= 12 bytes are received, these are now processed and responded to correctly (internal ref.: ID 555843).


2. Configuration

SIMATIC STEP7 V5.5 SP3 and higher

STEP 7 Professional V12 and higher

3. Additional information on the CP 343-1

CAUTION: Please note that at least version 3.0 must be installed as basis on the existing module for an update to FW V3.1.

Modules with firmware versions prior to V2.4 must first be upgraded to at least FW V2.4 (50583479). It is not possible to jump directly from firmware versions prior to V 2.4 to FW V 3.1.

Instructions for the general firmware update can be found under entry ID 24485272.


4. Download FW update

Third-party software - Licensing terms and copyright information

You can find the copyright information for third-party software contained in this product, particularly open source software, as well as applicable licensing terms of such third-party software in the Readme_OSS file.

Special information for resellers

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

 Registrierung notwendig  ReadMe_OSS.html (304,4 KB)

You can download the firmware V3.1 for the CP 343-1 (6GK7343-1EX30-0XE0) here.

Registrierung notwendig CP3431EX30_V3p1p1_OSS.zip (2.4 MB)


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
https://www.siemens.com/cybersecurity#Ouraspiration.
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