Hi elmcannic.

Thanks for the reply.

Basically what I've got going as far as getting this system to work. My plan is to send (use limits etc) +24V to a signal converter of sorts (hoping I can find a signal converter suiting my requirements).
The said signal converter then has to take the 3X +24V signals and 1X common and convert/switch this to a signal that the display can understand.

Not sure if there is a device like this available on the market but hoping you guys can give me more insight?