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In every control system available now even software assisted or through Micro controllers are the control signals are passed as electrical signals..it's because of Electrical signals are most efficient,fastest and economic communicating media excluded case of optics..
electrical control is used to control various electrical devices such as motor , pump, s.v etc now this control can be done more priciesly with the help of plc
electrical control divided into:
first section: calssical control
it is implementation the stages of processs by using relay
second section: modern control
it is implementaiton the processses by usuing plc