Help Constructing Ladder Logic Problem

Thread Starter


Joined Mar 18, 2020
The question is to write a PLC ladder logic diagram for a display sign that will sequentially turn on three lights 2 seconds apart, then turn all three lights off and repeat the sequence. My ladder logic diagram for this problem is labeled on problem 12. The problem is I don't know how to turn off the lights two seconds part from each other? What do I need to do to fix this problem?


Joined Jul 18, 2013
Another very useful instruction in this kind of desired result, in that some PLC's have is the rising/falling edge one shot and is only present for one scan of the logic when the instruction goes either high or low.