Special functions of a CPU 41x-H
6.2 Encrypting blocks
S7-400H
80 System Manual, 03/2012, A5E00267695-11
Result: Your block is now encrypted. The following symbols identify this status:
Encrypted block can be decompiled
Encrypted block cannot be decompiled
Note
Memory requirements
Each encrypted block with decompilation information occupies 232 additional bytes in load
memory.
Each encrypted block without decompilation information occupies 160 additional bytes in
load memory.
Note
Extended runtimes
The startup time of the CPU at power on, the loading time of blocks and the startup after a
system modification at runtime may be significantly prolonged.
Operation with FlashCard can significantly prolong the time for memory reset.
To optimize additional time requirements, it is best practice to encrypt one large block
instead of many small blocks.
If you have many encrypted blocks and change one of the following parameters, the error
"Unable to load system data..." could occur during the loading process.
Size of the process image
Size of the diagnostic buffer
Maximum number of communication jobs
Total amount of local data
Download the system data once again in this case.
Additional information
For additional information, refer to "S7 block privacy" in the STEP 7 Online Help.
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