PLC timer low instruction in LDMicro

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.

Timer low instruction Tlo instruction symbol

Tlo property

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.

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.