The Difference Between Relay and PLC Control Method

Jun. 08, 2018

The control of the relay is implemented by using hardware wiring. It is the combination of the hysteresis action of the series relay or parallel delay relay of the mechanical contact of the relay to form the control logic and can only complete the established logic control.

PLC adopts storage logic. Its control logic is stored in memory by program mode. To change the control logic, just change the program and call it soft wiring.

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