Rockwell Automation 1771ACN/B_1771ACNR/B,D17716.5.123 U.MNL CONTROLNET ADAPTER - Manual (Page 45)

Troubleshooting 5–3
Publication 1771-6.5.123 – May 1996
Recommended Action Probable Cause Description
Display
Mnemonic
STATUS
NET
ADDRESS
OK Indicator
OK
Red/
Green
Recommended Action Probable Cause Description
Display
Mnemonic
STATUS
NET
ADDRESS
OK Indicator
OK
Red/
Green
Green
RUN
Normal indication – processor is in
RUN mode.
None None
PRGM
Normal indication – processor is in
program or test mode.
None None
Blinking
alternately red
and green
BOOT Running boot code. Adapter has corrupted firmware.
Update adapter firmware with A-B
Flash Update Utility.
ControlNet Status Indicators
•
steady – indicator is on continuously in the defined state.
•
alternating – the two indicators alternate between the two defined states at the
same time (applies to both indicators viewed together). The two indicators are
always in opposite states, out of phase.
•
flashing – the indicator alternates between the two defined states (applies to
each indicator viewed independent of the other). If both indicators are
flashing, they must flash together, in phase.
A B and Cause Action
Off No power None or power up
Steady red Faulted unit Cycle power or reset unit
If fault persists, contact A-B representative or distributor.
Alternating red/green Self-test None
Alternating red/off Incorrect node configuration Check network address and other ControlNet configuration
parameters
A B or
Cause Action
Off Channel disabled Program network for redundant media, if required
Steady green Normal operation None
Flashing green/off Temporary errors None; unit will self-correct las in n o
Node is not configured to go on
line Make sure the configuration manager node is present and
working➀
Flashing red/off Media fault Check media for broken cables, loose connectors, missing
terminators, etc.
No other nodes present on
network Add other nodes to the network
Flashing red/green Incorrect network configuration Cycle power or reset unit
If fault persists, contact A-B representative or distributor.
➀ The configuration manager node is the node responsible for distributing ControlNet configuration data to all nodes on the network.
In this chapter you learned how to use the indicators on the front of
the module to troubleshoot your module.
Chapter Summary