Here is how to control an ATX power supply’s ON/OFF signal from a bare pin connected to the PS_ON signal, so that your board can tell it to turn off when needed:
switch.psu.enable true # turn atx on/off
switch.psu.input_on_command M80 #
switch.psu.input_off_command M81 #
switch.psu.output_pin 0.25o! # open drain, inverted
switch.psu.output_type digital # on/off only
switch.psu.failsafe_set_to 1 # so the ATX turns off on a system crash
#switch.psu.ignore_on_halt true # so the ATX does not turn off on a HALT condition (like limit trigger)
# However leave commented or set to false if you want the ATX to turn off for an over heat fault condition
Note: this uses the PSON pin on the power supply, which should be open-drain, thus the o in 0.25o!.
Here is how to control an ATX power supply’s ON/OFF signal from a small mosfet connected to the PS_ON signal, or to an SSR which powers the non ATX PSU:
switch.psu.enable true # turn atx on/off
switch.psu.input_on_command M80 #
switch.psu.input_off_command M81 #
switch.psu.output_pin 2.4 # small mosfet (NB not inverted)
switch.psu.output_type digital # on/off only
#switch.psu.ignore_on_halt true # so the PSU does not turn off on a HALT condition (like limit trigger)
# However leave commented or set to false if you want the PSU to turn off for an over heat fault condition