PLC retentive timer ladder diagram instruction in LDMicro

Ladder diagram retentive timer (High) Trto instruction measure the duration of the input high time. Whenever it reaches the preset timing value, this instruction output high.

Trto Symbol

This timer only store the timing value of the input high duration unless it's reset.

Trto timing diagram

Double click on this instruction to set a name and the delay. The delay is the input high duration of this instruction.

Trto Property

An introductory example, use an input contact to to turn on an output coil. The output coil logic state depends how long the input from high duration created by the contact is high.

Trto ladder diagram example

Another contact X1 optionally reset the Trto T0 timer whenever the user require. In this example, we don't need to select any MCU. PLC cycle time is generally 10 mS. Click here to download this ladder diagram example.