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Hi everyone,
I am new with the Step 7.
1) I am trying to use the SFC 20, I can understand the SRCBLK and DSTBLK, but what is the function RET_VAL and how to set it up?
2) We want to read 20 PIW. How to read all of the PIW in a single loop and stored them in DB block? Is there a built-in function in S7 to do that?
Thanks
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