Sequential Function

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Suggest a sequential function chart program to control the process shown in Figure to control the level of water in a storage tank by turning a discharge pump on or off.

The modes of operation are to be programmed as follows:

1.OFF Position —The water pump will stop if it is running and will not start if it is stopped.

2.Manual Mode —The pump will start if the water in the tank is at any level except low.

3.Automatic Mode —If the level of water in the tank reaches a high point, the water pump will start so that water can be removed from the tank, thus lowering the level.When the water level reaches a low point, the pump will stop .

Status Indicating Lights:

•Water pump running light ( green )

•Low water level status light ( red )

•High water level status light ( yellow )

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