Honeywell HC900 Installation And User Manual page 185

Diagnostics and Troubleshooting - Scanner indicators
Number Possible Cause
of
Strobes
3 One of the following
microprocessor exceptions
occurred:
• Watchdog timer timeout
• Address error
• Prefetch error
• Data abort error
• Software interrupt
• Undefined instruction error
3 One of the exception vectors
located in RAM became corrupted.
4 Flash failed to burn properly when
the firmware was being upgraded.
5 C75 only. The communications
with the reserve is failing for the
following reasons:
1. There is a problem with the
connection between the
scanner and the reserve.
2. The scanner port used to
communicate to the reserve
has a hardware failure
6 The modules installed do not
agree with those required by the
configuration.
Revision 19
06/14
Scanner Action
Scanner restarts. The main CPU detects that
the Scanner restarted, and places the
Scanner back into the scan mode.
The vector is restored to the proper value and
the Scanner continues to operate normally.
The boot code is the only software running.
This software waits for a request to burn the
flash. It does no scanning of modules. Module
outputs remain in their off state.
C75 only. This problem may cause on-
demand failover attempts to be unsuccessful.
No action is taken.
HC900 Process Controller Installation and User Guide
User Action
Cycling power to the scanner will
clear the diagnostic.
If the problem reoccurs, try the
following:
1. Ensure the system is properly
grounded.
2. Ensure the system is properly
isolated from external noise
sources.
3. Upgrade scanner firmware
4. Replace scanner module
5. Contact Honeywell Personnel.
Perform a code download.
C75 only:
1. Verify that the CPU A cable is
connected to the A port, and
the CPU B cable is connected
to the B port on the Scanner
2.
2. If a switch is used, check that
all cables are properly
connected to the switch,
proper crossover cables are
used, that the switch 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 pinout.
5. Cycle power to the Scanner 2.
6. Cycle power to the switch.
7. Cycle power to the reserve.
8. Replace the expansion rack's
scanner module.
9. Ensure that the Scanner 2 and
reserve software versions are
compatible. If not, perform a
firmware upgrade.
10. Replace the expansion rack's
power supply.
11. Replace the expansion rack.
12. Replace the main CPU.
Verify that the correct modules
are installed for the configuration.
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