Assignments on PLC Ladder Programming A) Simple PLC ON-OFF Instructions: Develop OR, AND, NOT, NOR, NAND, and EX-OR logic using two toggle switches and output is given to a pilot lamp. A fan is started and stopped from three different locations. Each location has a start and stop pushbutton. Develop a ladder program for a motor with START and STOP pushbuttons. Green lamp should be ON, when motor is running and motor should stop suddenly when bearing temperature is high, with red lamp indication. In a certain bank, each of three bank officers has a unique key to the vault. The bank rules require that two out of the three officers be present when the vault is opened. Develop the ladder program that will unlatch the door and turn on the light when two of the three keys are inserted. Draw the ladder program for following application. There are four hazardous inputs to the alarm system that goes ON when a fault occurs. The sequence is, If any one fault occurs, nothing will happen. If any tw...