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2.3. Examples of Applications

2.3. Examples of Applications

The following are some examples of control systems designed to illustrate the use of a range of input and output devices.

2.3.1. A Conveyor Belt

Consider a conveyor belt that is to be used to transport goods from a loading machine to a packaging area (Figure 2.40). When an item is loaded onto the conveyor belt, a contact switch might be used to indicate that the item is on the belt and to start the conveyor motor. The motor then has to keep running until the item reaches the far end of the conveyor and falls off into the packaging area. When it does this, a switch might be activated that has the effect of switching off the conveyor motor. The motor is then to remain off until the next item is loaded onto the belt. Thus the inputs to a PLC controlling the conveyor are from two switches and the output is to a motor.

  

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