- 24V to A1
- DC COM to A2
- Jumper S21 to S22
- S11 to one side of your ESTOP (jumper to both N.C. contacts if you have 2)
- One ESTOP N.C. contact to S52
- One ESTOP N.C. contact to S12
- 5V to terminal 13
- Terminal 14 to ESS ESTOP input pin.
- 5V to terminal 23
- Terminal 24 to Stepper Drive Enable
Make sure that your V- from all 3 power supplies are tied together (this is very important). This wiring will give you simultaneous ESTOP channels, one killing the steppers and one telling Mach 4 that the steppers have been shut down.
You have one more Safety channel (33 & 34) that can be used to power down a device (like a spindle) and one Aux channel (41 & 42) that is N.O. and can be used for diagnostics like a lamp that is ON when the ESTOP is pressed in.