Quote Originally Posted by JAZZCNC View Post
You just push against the din rail and the opposite side of the spring flips out of the din rail.
Another statement of the bleeding obvious that I totally failed to see. Unfortunately, it wouldn't have worked for me due to the fact that I mounted the IP/M box and its terminal adaptors so close that I couldn't remove either of them as they were hard up against each other. Do you think that one day I shall learn from my own experience? Seems unlikely, though...

Haven't yet tried the thing as I don't have a spare 24V supply and if all else fails I can restore the IP/M without too much effort. Fingers crossed, another mug of strong coffee, and back to the wiring.