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Redundant Overview
Diagnostics
Revision 9
900 Control Station User Guide
55
May 2014
Item
Status
Possible Cause
Controller Action
Fix
MARGINAL: PORT
I/O B
Rack communication
with CPU-B is
experiencing a high
error rate
Controller continues
to run but is
marginally
accessing the I/O
on the associated
rack
1. Check cable shielding for
proper grounding and noise
immunity.
2. Check connectors of all
cables.
3. If a hub/switch is being used,
verify that it is one that is
recommended by Honeywell
4. Replace cables
GOOD: PORT I/O A Normal operation
N/A
N/A
GOOD: PORT I/O B Normal operation
N/A
N/A
NOT USED IN THIS
CONFIGURATION
None of the I/O
modules contained in
this rack are being
used to execute the
control configuration
that is currently running
in the controller.
N/A
N/A
RESERVE I/O
COMM DIAG
GOOD
N/A
N/A
N/A
DATA LINK
FAILURE
•
Scanner2 address
switches are not in
the correct position
•
An I/O cable is
unplugged.
•
Cables are defective
or are not properly
shielded
•
If a hub is used, it
may be powered
down.
•
The Scanner2 is
powered down.
•
The Scanner2 is
defective
Controller continues
to run but is not able
to access the I/O on
the associated rack
1. If LEAD I/O COMM DIAG is
also “DATA LINK FAILURE”,
follow the Fix defined for that
diagnostic.
2. If a hub is used, check that all
cables are properly connected
to the hub, proper crossover
cables are used, that the hub
is powered, and it supports
100 Base-T.
3. Check cable shielding for
proper grounding and noise
immunity.
4. Make sure the cables have the
correct pin out.
5. Cycle power to the hub.
6. Cycle power to the C70R.
7. Replace the main CPU.
8. Cycle power to the Scanner 2.
9. Replace the expansion rack’s
scanner module.
10. Replace the expansion rack’s
power supply.
11.Replace the expansion
rack.
HARDWARE
FAILURE
The I/O interface has a
hardware failure.
Controller continues
to run but is not able
to access any I/O.
Replace the CPU.
PORT A/B CABLE
MISMATCH
The I/O cables from
CPUA and CPUB are
connected to the wrong
ports on the I/O
scanner CPU
Controller continues
to run but is not able
to access the I/O on
the associated rack
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