Just had to spend a while sorting I/O the wiring loom of a Logo8 (8 in 4 out) and connected I/O module (8 in and 8 out).

In my wiring loom there was an error and Logo system wasn't behaving as expected.

So I wrote the following test program:

- Select which I/O (1 to 16 in my case) is to be displayed, using the ESC + up/down cursor keys. I/O number, input state and output state is shown on the display.

- Setting the corresponding input high toggles the corresponding output, also shown on the display.

- Pressing ESC + right/left cursor keys turns the output on or off, also shown on the display.

Make sure your system is in a "safe mode" before playing with this program.

This enabled me to quick locate inputs 10 & 11 were swapped. In fact due to the fact the wireman had run out of "1" labels so he labeled wire 10 -> 10 and wire 11 -> 0. But the "1" from the "10" had fallen off, leaving him with two wires labelled "0". So he just wired them in hoping no one would notice and 50% chance of getting it right...

So someone else might find this program useful.

I did know how to display the inputs to a Logo using the status screens.

But I also needed a way of setting the outputs to verify the output wiring loom.