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You just have to apply the voltage to the coil and wait for a preset time to change the contact. While in a time-delay relay, contact is changed after a preset time when the voltage is applied to the coil. In a conventional control relay system, contact is changed as soon as voltage is applied to the coil. There are lots of applications where timers are used in PLC programming.Įlectromagnetic Time-Delay Relay vs PLC Timer Function As a very basic example, we require a timer to control the transition from star to delta function in a star-delta electrical motor starter. Timer plays a significant role to control the operation for a specific period of time. Advantages of PLC Timer over Electromagnetic Time-Delay Relays.
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Electromagnetic Time-Delay Relay vs PLC Timer Function.