CPM2A - Counter RESET

[Kristian 0]

Hi I am trying to build a sequential program for a cable cutting machine. After calculating the number of revs needed, the output of the encoder goes into a counter which counts the number of pulses, it then allows a clamp and a cutter cylinder to set and also counts the wire quantity. My problem is that the counters are already satisfied once I start the program, and so nothing happens, the process is not triggered. Anyone can help? Thanks, Program is attached CCM.cxp

[benbrad 0]

You could try differentiating your limit switch and encoder inputs this would stop the counters counting every cycle that the switch is made See example CCM__2_.cxp

[Guest anonymous]

Hello Kristian, What value is displayed for "PulsesNeded" (address 224) in the Counter itself? Be aware, in Section "Starting" rung 5, the addition will treat the result as a UDINT_BCD. This will mean that if the result is (e.g.) 123456, 'Pulses needed' may actually contain a negative value. Benbrad, the counter only decrements once on a false to true transition, so differentiating the contact shouldn't make any difference.

[Guest anonymous]

Hello Kristian, Think I can see where your problem lay... Before 'PulsesNeeded' can aquire a value, i.e. If 'LengthNeeded' is 0, the Counter will already see it at a value of 0, and will set itself ON. The set value for CNT001 will also always be 0 ('WireQuantity' is not used elsewhere in the program!), therefore the NC CNT001 contact is then permanently open, and will never allow Counter 0 to reset. Hope this helps

[benbrad 0]

Aye, you're right anonymous........ what can I say, it was early and I was decrementing a word in my own code. Confusion reigned

[Guest anonymous]

Hello benbrad, Early working... Never a good idea