Time delay of 5s has given using timers which will make each cycle with 5s delay. Program runs continuously until STOP PB is pressed Timer 7 (T7) done bit is used to restart the cycle from beginning Same procedures followed to turn on further outputs.( Refer Tabular column for sequence of operation) Network 8 Parallel circuits are added to turn ON/OFF the output in up next sequence. Starting the timer to turn on output East Green, North-South-West is in red. See Answer General Requirement: Traffic flow on a one-way street is to be controlled by way of a pedestrian crosswalk request pushbutton. Latching rung to operate the system through Master Start and Stop PB. The GREEN This problem has been solved You'll get a detailed solution from a subject matter expert that helps you learn core concepts. You can build your own concept for making logic for this example.įollow below tabular column – Logic for the four way traffic light List of Inputs and Outputs Traffic Light Control using PLC Logic Explanation Network 1 We can take four directions (North, South, west, and east) with three output lamps (Green, Red, and Yellow).
The traffic light is one of the classic examples in PLC ladder logic. Design ladder logic for 4 way-traffic light control system
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