Rockwell Automation 1771-IL Installation Instructions - Manual (Page 11)

Isolated Analog Input Module 11
Publication 1771Ć5.62 - November 1998
Possible module fault causes and corrective action are described in
the following table.
Indicators Probable Cause Recommended Action
RUN (green) off
FLT (red) off
No power to module Check power to I/O
chassis.
Recyle as necessary.
Possible short on module Replace module.
LED driver failure
RUN (green) on
FLT (red) on
Microprocessor, oscillator or EPROM failure
If immediately after powerĆup, indicates RAM or EPROM failure. 1
RUN (green) off
FLT (red) on
If during operation, indicates possible microprocessor or
backplane interface failure. 1
Hardware failure (blown fuse, etc.)
RUN (green) blinking
FLT (red) off
Powerup diagnostic successfully completed. Normal operation.
If indicator continues to flash, and write block transfers (BTW)
cannot be accomplished, you have a possible interface failure.
Replace module.
RUN (green) on
FLT (red) off
Normal operation None
1 When red LED is on, the watchdog timer has timed out and backplane communications are terminated. Your user program should monitor
communication.
For detailed troubleshooting
information, see chapter 7 of your
Isolated Analog Input Module User
Manual (publication
1771Ć6.5.128).
Troubleshooting