how is the Checksum calculated for a DB?

Dear user,

Does somebody know how the Checksum is calculated for a DB? Does it take into account the data value and structure, or only the structure?

 We don't know how the checksum related to blocks are calculated.it is secret for sure because if we have all these secrets , we are able to make our own STEP 7.

But it is possible to function test. . As a summary of the following video , the rule to generate the checksum of a simple DB is complex and it is depends on data types and structure.

I hope it helps,

hdhosseini