Post B4JNVnrFd22yA7Cahs by deprecated_ii@poa.st
 (DIR) More posts by deprecated_ii@poa.st
 (DIR) Post #B4Igp3g2k0vChJtXiy by deprecated_ii@poa.st
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       when a PLC does a "scan" can state change on the inputs between the start and end of the scan or are they sampled in a buffer at the beginning of the scanthe latter would make a lot more sense...
       
 (DIR) Post #B4JJk5T8Y33N1GTjP6 by john_rando@poa.st
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       @deprecated_ii I believe it is the second case. It is that way with the outputs, at least with the ones I've worked on. I've seen an output altered twice in a scan, but only the second alteration takes.
       
 (DIR) Post #B4JNVnrFd22yA7Cahs by deprecated_ii@poa.st
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       @john_rando it looks like the way they normally work is get all the inputs, work the logic, set all the outputs, repeat. which is definitely the smart way to do itsome newer PLCs can hit I/O in the middle of the scan but it seems rather ill-advised
       
 (DIR) Post #B4JseKoG608hFvLn60 by john_rando@poa.st
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       @deprecated_ii What type of PLC are you dealing with? I mostly deal with the Allen Bradley stuff myself, Compactlogix and Controllogix PLCs.
       
 (DIR) Post #B4JseKyXTmMXloA07U by deprecated_ii@poa.st
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       @john_rando I'm just learning general stuff at the moment. I have a variety of older PLCs (allen bradley micrologix, siemens S7-1200, mitsubishi FX3, and I'd like to get a delta) but I haven't started trying to actually use them yet