Wiring and assigning servo alarm for IHSV57 motors on Mesa 7i96s board

In pncconf, when I set any of the outputs to [Spindle > Spindle Enable] in the drop down in TB3 tab, I can then go into LCNC and toggle spindle [F9]. The LED on the Mesa for that output turns on and off, but I don't measure any voltage across the +/- pins in either state.

The VFD only has 1 common and want to use it for the fault circuit output loop. I don't see how a 2-wire output form the Mesa can tie into the single wire input for the VFD. There has to be something I am missing for how these are supposed to be wired.

Notes

Series connections of fault outputs will only work if they are normally on and off for faults
if they are normally off, they must be paralleled to combine them.

The 7I96S isolated outputs are switches, so must be used as such.

If the VFD inputs are sinking (connect to V+ to activate) you would
wire the 7I96S- outputs to the VFD control inputs and connect the
associated 7I96+ outputs to the VFDs +24V terminal.

If the VFD inputs are sourcing (connect to common to activate) you would
wire the 7I96S+ outputs to the VFD control inputs and connect the associated
7I96S- outputs to the VFDs input common pin

I believe I understand that concept.

Would the optocouplers in the servos be "normally open"? Doesn't it make more sense to have them NC so that a power failure to the motor would trigger something?

The Alarm outputs are NO so must be paralleled:

From the iHSV57 manual:

Alarm Signal: OC output signal, activated when one of the following protection is activated:
over-voltage and over current error. They can sink or source MAX 8 mA current at 24 V,
respectively 200mW. The impedance between ALM+ and ALM- is high for normal operation
and becomes low when any protection is activated.