.

Corvallis Chemical Company is designing a new filling station to transfer liquid chemicals from their production process to tanker trucks. The chemicals are contained in a large holding tank and emptied from there into the trucks. You must design the logic control for the pump motor used for the tanker truck filling system in ladder logic using the truth table approach. The pump motor control relay is controlled by the following sensors: A: Position sensor to sense if the truck is in position. This sensor is a normally closed weight sensor. B: Limit switch in the holding tank to sense whether there is enough chemical to fill a tanker truck. This switch is a normally open sensor. C: Limit switch on the filler tube nozzle to sense whether the chemical level in the tanker is at the proper level (to sense if the tanker is filled). This switch is a normally open sensor. CR: The pump motor control relay (CR), which is normally open. The pump motor should turn on when the tanker is in position and there is a proper amount of chemical in the holding tank. The pump motor should turn off when the tanker is full. (You would normally also have an emergency stop, but we are neglecting it in this problem for simplicity.)