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Write a PLC program that will alternate the use of two input pumps so that they both get the same amount of usage over their lifetime. The control process can be summarized as follows: The initial state of the tank is empty. A START/STOP pushbutton station is provided for the control of the two input pump motors P1 and P2 only. START PB is N.O and STOP PB is N.C. The way of controlling is described in the following bullets: o The START/STOP pushbutton is operated to control pump P1 first. Each filling will result in a full tank. When the tank is full, drain pump motor P3 is started automatically and runs until the low-level sensor is actuated. o After five fillings of tank by pump P1, control automatically shifts to pump P2 which means P2 is waiting for the signal to start. o Operation of the START/STOP pushbutton now controls pump P2. o After five fillings of the tank by pump P2, the sequence is repeated. Each sequence will result in an empty tank. Full-level sensor START Low-level sensor STOP P3 Write a PLC program that will alternate the use of two input pumps so that they both get the same amount of usage over their lifetime. The control process can be summarized as follows: The initial state of the tank is empty. A START/STOP pushbutton station is provided for the control of the two input pump motors P1 and P2 only. START PB is N.O and STOP PB is N.C. The way of controlling is described in the following bullets: o The START/STOP pushbutton is operated to control pump P1 first. Each filling will result in a full tank. When the tank is full, drain pump motor P3 is started automatically and runs until the low-level sensor is actuated. o After five fillings of tank by pump P1, control automatically shifts to pump P2 which means P2 is waiting for the signal to start. o Operation of the START/STOP pushbutton now controls pump P2. o After five fillings of the tank by pump P2, the sequence is repeated. Each sequence will result in an empty tank. Full-level sensor START Low-level sensor STOP P3

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