MikeC44

MikeC

3 posts in this topic

I have a program in a micrologix 1100 with a couple Timers   Time on Delay,  Everything seems like it is right but when the timer is energized, it goes thru the time delay  (8 seconds) times out and then just repeats never makeing the DN time complete contact.   What am I missing??

 

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I need to see the logic to know. DN is probably happening so fast that you don't see it energize. Use Timer[].DN to a OTL and see if it latches (it will)

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If the TON instruction is repeatedly restarting in the run mode you may have a free-running timer, which is a timer that is deliberately resetting itself through its own .DN bit. The Timer.DN tag is placed on an XIO instruction in series with the TON, and it runs over and over and over, without ever stopping. This is only one of a hundred possibilities. Two things you can do:

  1. Right click on the timer tag and run a cross reference report to find out everywhere it's being used and figure it out.
  2. Follow @Michael Lloyd's suggestion and post the code here so we can try to help you narrow it down.
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