Your timer bit will go done for one [the first] scan [cycle] when it reaches 300 seconds, but it will immediately reset and start timing again with your inclusion of the XIO of the same timer DN bit in series with the TON.
Hi, thanks for the reply.
but wouldnt on the next [second] scan cycle the output on first rung go low. which will make the second and third rung low as well?
Are you sure about that?But the motor doesnt stop.
First of all, the [XIO Carton_ZN09.Stop_Tmr.DN] on the third rung is unnecessary and can be removed...
I think you have a fundamental misunderstanding of how to use a PLC.
What you think you are telling it that it 'should' do isn't what you are telling it 'to do'.
The PLC will flawlessly execute the logic you input into it, every time.
It's not about what the program should be doing, it's about what it is actually doing.
Why do you expect the .dn to stop the timer?
Why is it on Rung 0 and Rung 2?
What exactly are you trying to do here?
trying to decipher why the motor doesnt stop. It doesn't because of the XIC bit Carton_Stage_Boxes_OFF_Delay.DN keeps it running.