SFB unlock ???

I'm try out the SPROT.EXE software for unlock KNOW_HOW_PROTECT blocks. But SFB and SFC blocks are locked furdhest. What can I do with them?

Hi,
There is nothing to see in them anyway, they are just operating system function calls.

regards

not possible

Hello Pietro is not possible to sprotect the dfb and sfc.

SFC and SFB are blocks with are fixed in the processor memory. If you go online and navigate to the blocks, you see all the inbuilt sfc and sfb. If you try to delete those online you will receive an error.

Hello Pietro;

I guess what we are trying to find out is "what would you want to do with an unprotected SFB"? Study the code? Copy or modify the block?

SFB/SFCs are standard program blocks that fulfill one specialized function each, the same in any S7 CPU (if they are loaded in the CPUs ROM, nao all CPUs can use all SFBs). If they were modified by someone, you would no longer have uniform applications of the logic, and that could lead to complications. Descriptions and explanations for each of the SFB/SFCs are available in the "System and standard functions" pdf manual; it is available in the Simatic/Documentation folder of the computer where you installed step 7; it is also downloadable from Siemens' support website.

On the reverse, if you do not like the way an instruction reacts, create your own (as a FB or FC), use yous SPROT executable to lock it, and re-use it in all your next projects. The logic will always execute the way it was programmed by you; no one else can modify it (unless they can unlock it....). We have people here who have created timers that operate "better" than the ones provided by Siemens, or PID logic that suits their needs.

Hope this helps,
Daniel Chartier