Honeywell 900 User Manual page 53

Controller Diagnostics
Item Status
Data Link Failure
Hardware Failure
Port A/B Cable
Mismatch
Revision 9
May 2014
Possible Cause Controller Action
The communications 1. Related rack monitor
to a particular rack is block's RACK OK pin is
turned off.
resulting in a lot of
DLL errors.
2. Depending on the
nature of the DLL errors,
the associated rack
monitor block's module
diagnostics, and pins
could be affected.
The power-up test of 1. All rack monitor block
the expansion rack XIO PORT DIAG are set
Ethernet controller to HWFAIL.
failed.
2. All rack monitor block
RACK OK pin are turned
off.
3. All modules in the
configuration have their
diagnostic set to
MOD_NOCOMM, their
rack monitor module fail
pin is turned on., and the
rack monitor block's
RACK OK pin is turned
off.
4. ASYS block's HW OK
pin is turned off.
5. The statuses for the AO
and AI channels that are
affected are set to
BAD_CHANNEL.
C70R only. The I/O Controller continues to run
cables from CPUA but is not able to access
and CPUB are the I/O on the associated
connected to the rack
wrong ports on the
I/O scanner CPU
900 Control Station User Guide
Main Menu
Diagnostics
What to do
1. Use the OI to determine which rack
is experiencing the DLL errors. Verify
that the expansion rack should be in
the configuration
2. Verify that the jumpers on the
scanner are setup for the correct rack
address.
3. If a hub is used, check that all
cables are properly connected to the
hub, proper crossover cables are
used, and that hub is powered.
4. Cycle power to the rack.
5. Cycle power to the hub.
6. Replace the HC900-C50 expansion
rack's power supply.
7. Replace the HC900-C50 expansion
rack.
8. Replace the HC900-C50 expansion
rack's scanner board.
9. Replace the main CPU.
Replace main-CPU module
Swap the cables so that I/O A is
connected to I/O on CPUA and I/O B
is connected to I/O on CPUB
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