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Transcript
Interface Lecture 9B Dr. Sheng-Jen Hsieh What is a relay? An electrical-mechanical device used to control two different circuitry with different power requirements It contains a coil and contact(s); as you provide the power to the coil, it generates magnet force which makes N.O. (normally open) contacts become Closed and N.C. (normally closed) contacts become Open. What are the applications of a relay? Turn on a motor requires a high voltage To reverse the motor rotation How to do the wiring? Wiring Interface Between Relay and PLC Modules
