Combination of ON Delay & OFF Delay  Timer ?On Delay & OFF Delay Tutorial (S7 200 PLC Programming)
Channel: factomation
Date: 2021-04-23

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✅Timer Operation in s7 200 plc programming
Use this instruction to program a time delay after instructions become true.
On – delay timers are used when an action is to begin a specified time after the input becomes true. For example, a certain step in the manufacturing is to begin 45 seconds after a signal is received from a limit switch. The 45- seconds delay is the on-delay timers preset value.
Off delay timer
Off- delay timer instructions is used to program a time delay to begin after rung input goes false.

As an example, when an external cooling fan on a motor is provided, the fan has to run all the time the motor is running and also for certain time (say 10min) after the motor is turned off. This is a ten minute off- delay timer. The ten-minute timing perio
begins as soon as the motor is turned off.

Retentive timer is a timer which retains the accumulated value in case of power loss, change of processor mode or rung state going from true to false (rung state transition).

Retentive timer can be used to track the running time of a motor for its maintenance purpose. Each time the motor is turned off, the timer will remember the motor’s elapsed running time. The next time the motor is turned on, the time will increase from there. This timer can be reset by using a reset instruction.
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✅Tutorials

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#off_delay_timer #on_delay_timer # #on_off_delay_timer