Hi everyone,

According to TiaPortal we have special library "diagnostics" which have FB Checksum. This block give us three parameters about Text list, software and safety signature. Using this parameters I'm able to check software CRC before and after modification.

But in classic Step7 I cannot find any solutions and ideas how to solve this problem like in TiaPortal. If you have any ideas how to control check sum I will be very grateful. 

Thank you

Hello AutoGen_8401825,

Maybe this FAQ will help you: creating a checksum over values in a data block