Question 3

Design ladder logic for 4 way-traffic light control system

The traffic light is one of the classic examples in PLC ladder logic. We can take four directions (North, South, west, and east) with three output lamps (Green, Red, and Yellow). You can build your own concept for making logic for this example.

Consider the following sequence for the logic.

ladder logic for 4-way traffic light control system


Solution: Ladder Logic & Explanation