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SysMemMove doesn't work?

BosseL
2017-12-22
2018-01-17
  • BosseL - 2017-12-22

    Hi, I am relative new in Codesys, but I have been working with Siemens for a long time.
    I am trying to use the functions in SysLibMem.lib (especially SysMemMove) and the code working fine in (Simulation mode) with Codesys 3.5 but not at all in 2.3. I intend to do a FIFO, but this is only the basic function before I move on to the “FIFO-function” with offset and so on so to speak.
    Is there any difference between these?

    My code looks like this.

    VAR
       sSourceString:   STRING;
        sDestString:   ARRAY [0..7] OF STRING;
       EdgeDetect:   R_TRIG;
       bInit:       BOOL;
    END_VAR
    EdgeDetect(cLK:=bInit);
    IF EdgeDetect.Q THEN
       SysMemMove(dwDest:=ADR(sDestString), 
       dwSrc:=ADR(sSourceString), 
       dwCount:=SIZEOF(sSourceString));
    END_IF
    

    Regards BosseL

     
  • BosseL - 2018-01-17

    It turns out that SysLib functions in Codesys 2.3 don't work in Simulation Mode. When I download this to a real HW-PLC it works fine.
    I did the same test with SysGetProjectInfo, both Sim-mode (didn't work) and in a real PLC (works).

     

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