Thanks for your welcome Clive.

Your reply is encouraging in that it seems I can use this board for the limit switches. The input terminal (IN1) I notice has my tool setter connected to it, which I guess works in a similar way to how the limit switches work. Would I be right in thinking that all the switches would connect to this one input terminal and the ground to the OV terminal. If that is correct then the wiring would be straightforward even for me, if using micro switches. I would be still keen to find out if I could use the optical switches I have here which have a third wire for which I guess would be the signal wire.

Regards

Roy