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Old August 8th, 2017, 04:23 PM   #21
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Doug-P is offline
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Join Date: Jun 2003
Location: Pa
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Originally Posted by Jrivers010 View Post
When working on programming, is it possible that a logic in a lower rung will cause a previously correct (before the later logic was added) rung before it to fault?.
This leads me to believe you're unclear on the PLC scan cycle. A cursory look at the PLC 1 curriculum doesn't mention this subject. Was the scan cycle covered in that unit?

Also PLC boot camp may be useful.
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