Assignment:
When the system of Figure is turned ON, the motor is to alternate rotation CW and then CCW, cycling, as the shaft extension contacts the two limit switches, RLS and LLS. All four switches have only normally closed positions. Prepare a PLC ladder program with the following requirements:
1. When the On button is pushed, the system motor moves the arm to the rightlimit switch position and waits 30 seconds.
2. The system then cycles 75 times between the right- and left-limit switches, and then stops.
3. The Off button stops the system at any time or, after the 75 cycles have been made, resets the system.
Provide complete and step by step solution for the question and show calculations and use formulas.