Rockwell Automation 999 IMC S Class Compact Motion Controller (Cat. No. 4100-999-122) - Manual (Page 68)

4-26 Installation and Hookup
Publication 999-122 - January 1997
The Drive Enable Outputs
Many servo amplifiers provide a drive enable/disable input which can
be used by the IMC-S/23x to disable the drive whenever feedback is
turned off. The drive enable outputs (one for each axis) of the
IMC-S/23x provide a normally open relay contact capable of
conducting up to 1 Ampere at up to 40V DC (24V DC nominal) for
this purpose.
While the figure shown earlier uses the drive enable output to switch
24V DC into a drive enable relay coil, if your servo amplifiers provide
an active-low TTL, CMOS, or 24V DC level drive enable input, each
drive enable output may be connected directly to the appropriate servo
amplifier. If your servo amplifiers provide a drive disable input, use the
drive enable output to switch 24V DC into a drive enable relay coil,
and connect the normally closed contacts of the relay to the appropriate
servo amplifier.
The Drive Fault Inputs
Many servo amplifiers also provide a fault output which can be used
by the IMC-S/23x to disable feedback and take the appropriate action
if a fault in the drive system occurs. The drive fault inputs (one for each
axis) of the IMC-S/23x require 12 mA at 30V DC maximum (24V DC
nominal) to provide this function.
If your servo amplifiers provide an open-collector, open-drain, or dry
contact drive fault signal, connect each drive fault input to the servo
appropriate amplifier as shown in the previous figure. If your servo
amplifiers provide a 12V or 15V DC level drive fault signal, use it to
drive a relay and connect the contacts from this relay to the appropriate
drive fault input.