Can I have an output for "MACHINE ON" condition

I am trying to run a Bridgeport Series II Interact 2 CNC mill and I am converting it to use with EMC.

So far it is going well. I am using PPMC.

However, I have one problem:

If I am out of estop, but without "machine on", the servo drives drift slowly and, as a result, the tables move very slowly.

I do not like this, as it will end up with a machine crash one day. What I want is to supply power to servo drives ONLY in "MACHINE ON" condition. In "machine on", drift is not a problem, as EMC holds position.

So: how can I tell EMC to send signal on some digital output pin, so that the motion power contactor would only be activated in "MACHINE ON" condition.

Thanks

This worked for me:

In the ppmc.ini file under the HAL section type:

HALUI = halui

then, in the ppmc_io.hal file type:

# connect machine is on to I/O controller
newsig MachineIsOn bit
linksp MachineIsOn <= ppmc.0.dout.06.out
linksp MachineIsOn => halui.machine.is-on

This turns on output 6, but you can make that whatever you want to enable your servos.
F1 on the keyboard releases the E-stop, F2 enables your servos. No drift!