Timer low Tlo instruction is normally output high. Whenever its input become low, this instruction creates a low logic delay time for a specified in its property, then it goes back to high.
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| Timer low instruction Tlo instruction symbol |
00:00 / 00:00
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| Tlo property |
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| Tlo timing diagram |
The low input duration must be longer than the PLC cycle time.
A typical example shows how to use this type of timer. In this introductory example, I use an negated input contact to activate the Tlo instruction. This activation turn on an output coil for 10 seconds.
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| Tlo ladder diagram example |
In this example, the MCU in-use is not specified. The PLC cycle time is 10 mS. Click here to download this ladder diagram example.
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