When a switch is turned on, PL1 and PL2 immediately go on. PL1 turns off after 4 seconds. PL2 remains on until the switch is turned off. Turning the switch off at any time turns both lights off. Write...

When a switch is turned on, PL1 and PL2 immediately go on. PL1 turns off after 4 seconds. PL2 remains on until the switch is turned off. Turning the switch off at any time turns both lights off. Write a program that will implement this process. Enter the program into the PLC and prove its operation.