Controlnet Network Status Indicators - Allen-Bradley ControlLogix User Manual

LED Display
Cause
OK
Green or BPRX Too many CRC errors being
Flashing ERR generated by the multicast
Green backplane receiver, so the
backplane multicast receivers
have been shut off.
KPR The configured keeper object
within the module is unable to
ERR
operate on the attached
network.
BW Module is receiving too much
XCED network traffic and
connections are timing out.
The network bandwidth has
been exceeded.
SW Module's network address has
ERR been changed since module
power-up.
Flashing NET Network cabling error or no
Green ERR other nodes on network.

ControlNet Network 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.
Cause
and
A B
Off No power
Steady red Faulted unit
Alternating Self-test
red/green
Troubleshooting
Action
Cycle power on the module or send
a reset to the module. If condition
persists, replace the module.
(This error is caused by a module
hardware fault or noisy backplane.)
1. Verify that this module is
attached to the correct network.
2. Rerun RSNetworx on this network
to update the module's keeper
object.
None required (temporary
condition).
If this happens frequently, add
another 1756-CNB or -CNBR and
split the traffic between them.
1. Optional, see page.)
Turn chassis power supply off.
2. Remove the module from the
chassis.
3. Set the network address
switches to a unique address
(01-99).
4. Install the module in the chassis.
5. If off, turn chassis power supply
on.
Re-check your network cabling and
make sure another node on the
network is active (online).
Action
None or power up.
Cycle power or reset unit
If fault persists, contact A-B
representative or distributor.
None
1756-6.5.3 - December 1999
12-3