plcladder-logic

How do I set an unlimited timer in ladder logic?

I am a newbie at ladder logic. The program linked below runs a timer, and updates the delta time between each "frame".

https://www.plcfiddle.com/fiddles/e56c6cf0-d858-4327-b291-7cdc1067ffc1

enter image description here

The preset value for the timer is set to 10, so the timer stops after 10 seconds. I want this timer to run indefinitely. My first guess is to set the preset value to 0 (or a negative number), but this prevents the timer from running at all.

How can I make this function run indefinitely?

Solution

  • No need to run the timer indefinitely, just reset the timer each scan (no such thing as a frame where I come from).

    See this updated fiddle.