Siemens blockmove

[Ranjith]

Could some one please tell me how to copy an entire data block to another in Step 7. I used SFC 20 in the ladder compiled and downloaded to CPU. but it did not copy the contents.

 

[dchartier]

Hello Ranjith;

SFC20 "BLKMOV" is a standard way of transfering blocks of data from one location to another with Step 7. It works, and it is simple to use, if you understand ANY pointers for Source and Destination areas.

Could you please post the code you are using, we may find the source of the problem by examining it.
Hope this helps,
Daniel Chartier

 

[L D[AR2P#0.0]]

Here's an example of SFC20 in use. DB1 and DB2 are both 64 bytes long. Note that if SFC20 fails, the return value will be non-zero and will indicate what is wrong.