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

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).