Publication 1756-UM523F-EN-P - December 2006
106 Maintain and Troubleshoot the System
1. Observe the 1756-CNB/D/E or 1756-CNBR/D/E modules in the
primary chassis.
2. Observe the CNB modules in the secondary chassis.
Primary CNB Front panel If It means So do this
PwQS Primary with Synchronized
(Qualified) Secondary
Stop. The redundant chassis are
synchronized.
PwDS Primary with Disqualified Secondary Go to step 2. A problem exists. The
redundant chassis are not
synchronized.
PwNS Primary with No Secondary
Look here.
Front panel If the display
shows
Then So check
!Cpt The CNB modules in the
primary and secondary
chassis do not match in
some way.
• The CNB modules in the primary and secondary chassis are the same
revision, or the CNB modules in the primary chassis are series D and
those in the secondary chassis are series E.
• Each CNB module has a partner in the same slot in the other
redundant chassis.
• Each pair of CNB modules (one in each chassis) is set to the same
node address.
• Each module has compatible firmware.
• All CNB modules in each redundant chassis are valid keepers. See
Update a Keeper Signature on page 107.
CMPT Some module other than
this CNB module does not
match between the primary
and secondary chassis.
• Each module has a partner in the same slot in the other redundant
chassis.
• Each pair of controllers (one in each chassis) has the same memory
board (for example, 1756-L55M14).
• Each module has compatible firmware.
• The RSLogix 5000 project is configured for the right type of controller
and redundancy is enabled. See Configure a Controller for
Redundancy on page 68.
• The Module Configuration window for the 1757-SRM module does
not list any reasons for the failure to synchronize. See Edit Sessions
in Progress on page 108.
DUPL NODE More than one device on
your ControlNet network is
using the same node
number.
• No other device on the ControlNet network is set to the address of
the CNB modules plus one.
• For example, if the CNB modules are set to 3, no other device should
be set to 4.
• The 1757-SRCx cable is connected to both SRM modules.
NET ERR The ControlNet media is
not completely connected.
• All ControlNet taps, connectors, and terminators are connected.
Secondary CNB
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