I was having trouble sleeping last night, I was obsessing about CNC
machine wiring.
In an attempt to break the cycle I went on eBay and bought
http://www.ebay.co.uk/itm/291551363807

In the cold light of day I think I made a mistake.

I wanted to control the two clutches and the brake on my lathe
gearbox. These have a single wire to a brush (24V) and return via the
machine frame.

I don't think that this device can be wired to operate them unless I
create a separate -24V supply by wiring the +24 of a PSU to the
machine frame.
I also don't think that it is particularly well suited to being driven
by the 7i84 outputs.

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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