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Thanks Tommy, Don't actually know the technology, but all the limit switches on the machine are the same, and magnetic.

Signal goes to an optical isolator and the output from that to the 7i77.

Have only just now noticed that the Upper switch is labelled +OT.. A likely start of my confusion.!

Now that I've actually managed to run the machine and draw that famous Linuxcnc outline with it on a piece of paper, I fear it less and know better what the configurator questions are really aimed at, I'm going to create a new build from scratch and check this out all over.