PLC retentive timer low ladder diagram instruction in LDMicro

A ladder diagram retentive low Trtl instruction, work in a similar way as the Trto instruction but it keep the low input duration until the preset low timing value is reached. Whenever it reaches the low timing duration, it creates an output high logic unless it's reset by the timer/counter reset instruction.

Trtl Instruction Symbol

It timing diagram show a inverse process of the input timing to Trto.

Retentive Timer Low Timing Diagram

Its name and delay are set in the instruction property.

Trtl instruction setting

This simple example similar to previous one's, but using this retentive timer low instruction. The Trtl count the low time duration creates by the input contact.

Retentive timer low instruction example

X0 is an negate type contact to control the T1 Trtl. Xreset contact put to reset the timer by user.

Click here to download this ladder diagram example.