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IF logic - Check if Mvar isn't defined in PLC


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OK, I did end up finding a solution, although I'd still like to hear if anyone has a better way of doing this.


To check if an Mvar is defined, I defined a 2nd Mvar that points to the first Mvars' pointer location (see Turbo software reference manual, memory map section). The Turbo PMAC2 Mvars pointers are located at L:$4000-L:$5FFF.


M101->X:$4064,24 ;(point to M100 pointer location)
IF(M101>0) P100=1 ELSE P100=0 ENDIF ;(check if M100 is defined or not)

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