In this project, a ladder logic program is used. This type of timer is called as ON DELAY timer The on-delay means delayed switching on the outputs (NO) contact this means that timer does not change to close contact until the preset time is reached. In the program part, on delay timer is most commonly used in the PLC ladder logic system. The on-delay timers are mostly used in electric circuits. In this project On delay, timer plays a major role in this program. It describes the systematic steps to turn on the output of traffic light lamps. Start/Stop buttons are Pushbuttons (Momentary contact).The traffic light turns yellow before doing any signal switchover.Only free left is allowed (Considering Right-hand driving condition).At one point in time, only one side of traffic is allowed.This program is designed with the below-mentioned assumptions in mind For the four-way traffic light control system, we are using 12 outputs, 2 inputs, one memory and On-Delay timers as shown in the table below S.
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