Timers in PLC Programming!
Timers are one of the most often used functions in #PLC programming.
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Timers are pre-defined functions. They are added to a PLC program as an instruction block, with parameters such as Enable, Preset Time, Accumulated Time, and Timer Reset built into the timer function.
► On-Delay Timer: Once the input of the timer becomes true, the timer is enabled. The #timer times until the preset is reached, and the done bit is set. If the timer input is no longer enabled, the timer resets. Once set, the done bit stays true until the rung goes false.imes until the preset is reached, and the done bit is set. If the timer input is no longer enabled, the timer resets. Once set, the done bit stays true until the rung goes false.
This type of timer allows the programmer to delay an action for a specified duration after the input becomes true.
► Off-Delay Timer: Acts somewhat in the reverse of an On-Delay timer. Once the input goes true, the done bit is set immediately. When the timer input goes false, the timer begins to time and after the preset is reached, the done bit turns off.
This type of timer is useful for ensuring actions continue for a certain duration after the input has been deactivated.
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