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dugmick

logic will not solve

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Hi all - I am stumped - I have some logic that will not solve in an S7-400. I have been reducing the logic in troubleshooting to understand the problem, but still no luck. I have an input I144.0 that is ON, but no output (external, internal, or local variable) will turn on when the logic is true. I created a local variable (#test), only used in my example, that will not turn on at the top of the network (in red), however, it will turn on in the next grouping of logic (in green) when my input is true. I have inserted a new network and copied the logic with no change in result. Any ideas?? Thanks in advance

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Check the previous segemnt, or post it here. The RLO of the previous sement is "acting" as an "AND" with your first two lines untitled.bmp

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I did find the problem, it was as Moggie questioned. There was an output that had been commented out in the previous network, and that was affecting the RLO in question. Thanks everyone.

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