Rockwell Automation 999 IMC S Class Compact Motion Controller (Cat. No. 4100-999-122) - Manual (Page 41)

Technical Overview 3-11
Publication 999-122 - January 1997
Drive Fault Output
The drive fault inputs may be connected to the fault outputs (if provided)
on the amplifiers for each axis. This allows the IMC-S/23x to react to
a fault in the amplifiers themselves. Like the other discrete inputs, the
drive fault input may be enabled and disabled from the application
program, and may be configured to operate with active-high or
active-low drive fault outputs. When a drive fault input is activated,
assuming the function is enabled, the IMC-S/23x stops all motion on
the particular axis and deactivates the appropriate drive enable output.
Drive Enable Output
The drive enable output for each axis allows the IMC-S/23x to disable
the axis amplifiers in the event of a motion fault. Since it uses a floating
normally-open relay contact, the drive enable output can be connected
to amplifiers having either active-high or active-low enable or disable
inputs.
Position Registration Inputs
Special, high-speed, optically-isolated inputs on the IMC-S/23x (one
per axis) provide a direct interface for position registration sensors. The
position registration inputs are unfiltered to minimize propagation
delay for speed-critical position registration applications and can be
directly connected to sensors (or encoder markers) operating on 5V or
24V DC.
When a position registration input is activated, assuming the position
registration feature is enabled, the current actual position of the axis is
immediately latched in hardware into a special registration latch. The
latched registration position is then available within the application
program for calculations.
Status LEDs Three general purpose status LEDs are provided on the front panel of
the IMC-S/23x. Labeled Status 0, 1, 2, these LEDs are used to indicate
the results of the power-up diagnostics performed whenever power is
applied to the IMC-S/23x. If the IMC-S/23x passes its power-up
diagnostics, all three status LEDs are turned off and the CPU watchdog
LED (System OK) is turned on. At this point, the three status LEDs
may be used by the application program for any desired purpose.
If all three status LEDs are not off after power-up, the IMC-S/23x did
not pass its power-up diagnostics, and the CPU watchdog is not
activated. In this case, the code shown on the three status LEDs indicates
the specific test which failed.