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Siemens Industry Online Support
Siemens AG
Entry type: FAQ Entry ID: 51577287, Entry date: 08/15/2011
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How can you detect a change in the S7 user program in STEP 7 V5.5?

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Description
The S7 program which is available in this FAQ as a download offers the opportunity to detect changes in the program code and in the hardware configuration. The appropriate checksums from the system status list are determined and verified here.

If a change is detected, a user-definable entry is created in the diagnostic buffer of the CPU.

PROG_CHECK_en.pdf ( 355 KB )

PROG_CHECK.zip ( 253 KB )

Creation environment
The pictures and downloads in this FAQ were created with SIMATIC STEP 7 V5.5.

Keywords
Program protection, SFC51

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
http://www.siemens.com/industrialsecurity.