Introduction To PLC

A PLC (Programmable Logic Controller) is a device that was invented to replace the necessary sequential relay circuits for machine control. A PLC is an industrial computer used to monitor inputs, and depending upon their state make decisions based on its program or logic, to control (turn on/off) its outputs to automate a machine or a process.
PLCs operate by monitoring input signals from such sources as pushbutton switches, proximity sensors, heat sensors, liquid level sensors, limit switches and pressure and flow rate sensors. When binary logic changes are detected from these input signals, the PLC reacts through a user programmed, internal, highly sophisticated, logic switching network and produces appropriate output signals. These output signals may then be used to operate external loads and switching functions.

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