Unusual use of M8/M9 to control a compressor

[ngwagwa]

Thanks Doddy - I did think this would be right up your street.

Regarding the logic I only need the compressor on certain parts so whatever I do I would like it to work in a way so I don't have to re-programme existing parts so don't think having UCCNC take control on startup would be the right way to go. Is there a relay available that when an M8 call is made the manual switches are isolated and power supplied to the compressor. If it makes any dfferece when an M8 call is made there will be at least 30 minutes before the compressor is turned off

EDIT: I have found this OMRON MK2P-S relay left over after my retro-fit. With my limited electrical knowledge I think it fits the bill?