sah676 Posted May 18, 2012 Report Posted May 18, 2012 Hi all, I'm making the leap from traditional ladder to using structured ladder with function blocks. I had been using structured project with traditional ladder function blocks (sort of semi-structured) but my current job is on an FX3U, which only allows completely unstructured projects (a big lump of MAIN) or structured project with structured ladder. I've had a battle to find the equivalents of many of the old instructions, but I've got stuck at "Operation Result Rising Pulse" - you know, good old Alt-F5, rising pulse of whole chunk of logic rather than a single bit. (see pic). There is a function block R_TRIG, but I'd really rather not use a big ugly FB and have to declare every instance of it. Anyone know if this instruction is still available? Quote
kaare_t Posted May 18, 2012 Report Posted May 18, 2012 Not sure if I completely understand you but have you looked ath the PLS_M (rising trigger pulse)? Quote
sah676 Posted May 18, 2012 Author Report Posted May 18, 2012 Quick reply! Thanks, PLS will do the job for me. Can't help thinking it's very ugly though! Welcome to function block diagram I suppose. Not as nice as a tidy little up arrow. Thanks again. Quote
kaare_t Posted May 18, 2012 Report Posted May 18, 2012 Yes, Structured Ladder is quite different but once you start using it it isn't that bad but I've been using structured ladder for 7 years so I'm not that objective.... Quote
sah676 Posted May 21, 2012 Author Report Posted May 21, 2012 For anyone who finds this in the future, MEP is the direct equivalent of the result rising pulse arrow. . Obviously it works identically to PLS but has one less output argument. Quote
KenE Posted May 21, 2012 Report Posted May 21, 2012 You can use the rising edge: I've been using this for a little while. It used to not be in IEC developer. It is more handy than using PLS_M in some cases. I'm using GXWorks2 1.64S ... not sure if this feature just came out or not. KenE Quote
sah676 Posted May 22, 2012 Author Report Posted May 22, 2012 Yeah, rising pulse of a single bit is still in structured ladder. In my case I'm taking the rising pulse of (Trans && NOT TrBusy), with an arbitrary number of operators before the PLS. Quote
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