FC/FB Scan cycle

[Svethski 0]

Hello all, I'm a beginner in S7 programming and I'm trying to detect the first cycle of an FC/FB who's conditionally called, so first cycle can occur several times unlike the OB1_SCAN_1 "1" state. To do so, I try this but I'm not sure it's the better way cause I experiment some undesired behavior (maybe not related with but I ask in case you guys have some clues for instruct me .) A #ENSignal BLD 100 FP #PrevENSignal = #FirstScan First, I thought it can do the job but I'm stuck there now and I think it can be the problem source. So, it would be very nice if I can get your point. (Forgive me if my English is sometimes weird, I'm French speaking native).

[Moggie 17]

The "undesired behavior" may be caused by the use of temp variables. Try using markers (M) instead! Edited 27 Dec 2010 by Moggie

[EirikV 1]

Edited 31 Mar 2011 by EirikV