I have a UDF that works in UDF simulation, it does not work on the hardware.

Checked the following,

1. UDF hardware version
2. Replaced inverted bits with High flags.
3. Joined all networks (Comfort soft has issue with cut networks for analog inputs)

Are there any other rules for using UDF’s besides the 3 guidelines in the manual ?

Must all open inputs have HIGH or LOW Flags ?

Thanks

On the UDF there are 2 ways to write a delay-off function,

1) use the delay-off function with a rising edge to trigger delayed off, the trigger should be <2ms.

2) use delayed on with logic to invert the output.

Method 2 works on LOGO PLC, method 1 does not work.

Could this be the issue ?

Its within the spec of UDF's.

The problem is with the LOGO timing within the UDF, I managed with the last solution.