The work process to carry out an industrial task usually involves many recurring steps. These steps can be carried out manually or automatically. In the manual system, an operator is always present to decide every process step. In the automatic system, the process controls itself, partially or entirely, by the feedback of its condition. Therefore, an automatic system can be semi-automatic or fully-automatic.
In the semi-automation, a machine automatically carries out several recurring partial steps in the processing of a work-piece. Here an operator is required to initiate every cycle of operations.
In the complete automation, a machine carries out the cyclic operations in the processing of several jobs automatically. Sensors and/or transducers are invariably used in automatic control systems.
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