Retrofitting an 89 Chiron FZ12W aka Igor

the 7i97 with the other cards should have enough IO's of your machine.
I would start by making me a List of all the IO's on the machine which are in use what addition IO's I will add later and then chose the suiting card combination. I have plenty in spare on the Chiron. With the latest cards I my have opted for another setup.

Okk

My I/O scenario.....

Hi Is your Spinde really Really run by IO's Mine runs with +-10V
and have just one controller release.
have you checked with the wiring?
Watt about the controller releases for x y and z? are there none?
Same for Estop out?
Mine works with bi stable air valves. So I have one relay for spindle up and another for down.
and a relay for all tools up. You should check that.

But still then you should be fine with one 7i97 and one 7I84

You are right, I just saw in the documentation that it is the same as your spindle at +/- 10V also for the spindle up and down via two relays as yours.
As for releasing the axes, I can't figure it out...but as far as I remember when it was working properly I had to release the e-stop after starting the machine in order to start the control and axes.
Today I am ordering 7i97 and 7I84, so we will be in touch when they arrive.

Best regards

Which spindle oil is used? Is the chamber where the motor and spindle connect also the oil reservoir? I too have a chiron fz12w I retrofitted.