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External M Code Mori NL2000

Another method would be to "rob" another M code. Often M7 or M50 are provided as alternate coolant signals. If your machine has those but they are not utilized in your configuration, you may be able to use one of them.
I thought about this as we have a set of mist collector M codes not in use but unfortunately been unable to locate the M code relay on the main board.

I would really like to use the external M code board if possible as I feel that's the whole reason for its existence but the non latching aspect of it is making it far more complicated than initially thought.
 
The external M code setup you have is pretty ideal for adding things like a parts catcher or conveyor, part loader/unloader etc. Not so much for something like a coolant pump.

Using something like this would simplify the hardware end.
 
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