Question

what is the requirement for the traffic light system on PLC​

Answer 1

Answer:

The PLC checks the status of the sensors. The system resolution is dependent on the output provided by the sensors, then PLC checks the priorities and then provide output signal to the traffic light poles for ON or OFF the red, yellow or green lights and ON time is dependent on the specific priorities.

Answer 2

Answer:

1.They are so many ways to write a program for traffic light control ex: sequencer output method but in this normal input, outputs and timers are used.

2.Timers are used to give time delay for output to turn on and off.

3.Reset using timer done bit at the end to run the program continuously.

Program done in AB RSLogix 500 Software.