Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 285)

Section 5A
9/440 Resolver--based CNC/Drive System
5A-39
9/440 Resolver--based CNC/Drive has 4 LEDs on the system module and
one LED on each axis module in the system. The LEDs operate as
follows.
System Module LEDs
The system module has 4 LEDs. They are:
LED Indicates
XILINX Under normal operation this LED is on. If it
turns off while the system module is under
power it indicates a XILINX hardware fault.
Contact your local Allen--Bradley Service.
WATCHDOG Under normal operation this LED is on. If it
turns off while the system module is under
power it indicates the watchdog has timed out
and a processor failure has occurred. Contact
your local Allen-Bradley Service.
R--I/O Only available on systems with remote I/O. This
LED illuminates when the remote I/O link is
communicating. See page 5A-26.
STATUS This is identical to the Watchdog LED but is
visible through the system modules front cover.
9/440 Resolver--based
System Module
Open Cover
Press Cover
Release to Open
Wiring Board
WATCHDOG
XILINX
Status LED
R-I/O LED
(visible from under system
module in front of serial
port B)
5A.7
9/440 Resolver- based LEDs