Hello,

2 Days ago I was adding a timer on a Modicon Quantum 113/03 using Proworx. I forced the contacts on the shutdown logic of a compressor, to edit on the coil of the same contact. It was a LSHH. The problem was that, even though the contact on the shutdown logic was forced, when I erased the coil, the force in the contact was removed automatically. That executed a shutdown sequence on the 2 compressor that work on cascade.

Later I did the same thing with many contacts/coils to reproduce the event, and it worked the same.

Is it normal? Has this thing happened to any of you? Is it something I'm missing?

I will appreciate your help on this, because, to the best of my knowledge, this shouldn't have happened.

Thanks in advance.

 

That is how it works. When you delete a coil from the logic it removes the forced state and value. I have had that happen as well. As long as you know that is how it works you can do your on-line changes without interrupting operations.