I said that the problem is in software, but I am assuming that all inputs are correct when you have this problem. Also, check your code date and see whether or not the code addressed this condition before you change anything.
IDEC's you can download ladder logic, but no labels if you don't have the source code. In other words you download, look at a bunch of contacts, coils, timers, counters, but you have no clue what they do because you don't have any labels.... That is unless you have the source coded.
