4/10/2023 0 Comments Tof plc ladderWhen the input/trigger switch closes, output contact changes and timing begins. In an Off-Delay timer when the voltage is applied to the coil nothing happens. The contact changes as soon as time has expired and remains changed until the voltage is removed from the coil. In an On-Delay timer timing begins when the voltage is applied to the coil of the timer. There are different types of Time-Delay relays available in the market: This is the block diagram of Time-Delay Relay: 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.Electromagnetic Time-Delay Relay vs PLC Timer Function.
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