These things are an absolute PITA - too much wiring to the door. Better to use a panel mounted PLC with a comms cable to the screen in my view - saves heaps of time and wiring and the more expensive screen/PLC combination is more than covered by not having to waste time, wiring and money wiring heaps of stuff to the door.
I think Horner have one with expansion I/O that mount in the panel rather than on the door which would be much better.