MESA 7i76U inputs changing state without changes to config

7I76U inputs are always sinking so normal connection would be:

+24V --> SWITCH --> 7I76U input

If you look in halshow, hm2_5i25.0.7i76.0.0.input-07 will always be
in the opposite state as hm2_5i25.0.7i76.0.0.input-07-not, so choosing
one or the other should make a difference.

Thank you to everyone. I've finally got the EStop to work correctly, though I don't understand why. Apparently, it works opposite of the limit switches in that there must be a high signal on the pin at startup and EStop is triggered when the switch is opened. Regardless, I can now home and run as expected.

Normally you would use a NC switch for Estop and the you would use the true (no -not)
input to sense it. This is so that when Estop is not activated (switch = closed circuit),
iocontrol.0.emc-enable-in will be true so no Estop. Then when Estop button is activated
(switch= open circuit), iocontrol.0.emc-enable-in goes false, signaling an estop event.

Did you verify that estop-ext changes state when you change the Estop button from on to off?

Yes, I now have the estop working as you specified and have verified that it stops the machine when the button is mashed (OPEN).

I'm on to getting my HY_VFD spindle hooked up.

Thanks to all who have helped on this issues.