Rockwell Automation 1756-CNB ControlLogix ControlNet Bridge Module Installation Instructions User Manual
Page 24
 
24
Publication 1756-IN571B-EN-P - April 2001
Red
DUPL 
NODE
For a redundant system this may 
be a temporary condition during 
chassis switchover. Otherwise, 
the module’s network address is 
the same as another module’s on 
the link. 
1. (For redundant systems only.)
Wait 10 seconds; if the 
condition persists, perform the 
following steps:
2. (Optional, see page 11.)
Turn chassis power supply off.
3. Remove the module from the
chassis.
4. Set the network address
switches to a unique address 
(01-99).
5. Install the module in the
chassis.
6. If off, turn chassis power
supply on.
RACK 
ERR
Cannot read backplane EEPROM, 
or rack/slot address incorrect
Replace the chassis.
STOP
CNB commanded to stop 
functioning by the redundancy 
module. This occurs when a 
non-redundancy compliant CNB 
is placed into a redundant 
secondary chassis.
Remove non-redundancy 
compliant CNB from redundant 
secondary chassis and replace 
with redundancy compliant CNB.
WAIT 
RM
CNB waiting for the redundancy 
module to complete power-up.
None required.
Flashing 
Red
BOOT
Module has invalid firmware.
Update module firmware with 
ControlFlash Update Utility.
ROM
UPDT
Flash update is in progress.
None required.
SNGL 
KPR!
Module detected that it has 
been connected to a Cnet 1.5 
(single-keeper) network.
Update the CNB module’s 
firmware at MAC ID 01 and 
reschedule the network.
Diagnostics
LED
Display
Cause
Action
OK