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System Controls(PLC)

A system control manages, commands, directs, or regulates the behavior of other devices or systems using control loops. It can range from a single home heating controller using a thermostat controlling a domestic boiler to large Industrial control systems which are used for controlling processes or machines.For continuously modulated control, a feedback controller is used to automatically control a process or operation.

The control system compares the value or status of the process variable (PV) being controlled with the desired value or setpoint (SP), and applies the difference as a control signal to bring the process variable output of the plant to the same value as the setpoint.For sequential and combinational logic, software logic, such as in a programmable logic controller, is used.