Honeywell HC900 Installation And User Manual page 177

Diagnostics and Troubleshooting - Controller CPU indicators
Number Possible Causes
of Red
Strobes
2 There are slave blocks
in the configuration,
and no communication
port is configured as a
Modbus master.
2 Controller mode is
changed to RUN-
Locked while there
are forces present
on safety
worksheet.
2 Controller mode is
changed to RUN-
Locked when safety
configuration is
changed at run-
time.
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.
Revision 19
06/14
Lead and/or Reserve Controller
Action(s)
• MSTRFAIL pins on ASYS and
FSYS blocks turn on.
• All Modbus slave and Modbus
read blocks freeze their output
pins to the last value.
• All slave blocks have their BAD
COMM pin on.
• All slave blocks have their NO
SCAN pin on.
• IN SCAN STATUS is set to NO
for all slaves.
• COMM STATUS is set to BAD
for all slaves in the function block
diagram.
• Statistical counters for all slaves
are 0.
• Controller will not go to
RUN-Locked mode.
• Controller will not go to
RUN-Locked mode.
At the time of the exception, the
microprocessor resets. If it's the
Lead controller, and there is an
available reserve, a failover occurs.
When the microprocessor
completes its reset condition, it will
become an available reserve if a
lead is present or become a lead if
no lead is present.
This diagnostic will cause the
HWOK pins of the AYSY and FSYS
blocks to be turned off.
The exception vector was
automatically corrected in the
controller's RAM and the controller
continues to operate normally.
This diagnostic will cause the
HWOK pins of the AYSY and FSYS
blocks to be turned off.
HC900 Process Controller Installation and User Guide
User Action
1. Use the OI, HCDesigner, or
HCUtilities to configure one of the
serial ports (S1 or S2) as a master.
2. Use the OI, HCDesigner, or
HCUtilities to download a
configuration that has no slave
blocks.
1. Change mode back to RUN
mode OR
2. Clear all safety forces using
HCD through Monitor-
>Forced Blocks OR
3. Force a cold-start
1. To clear the diagnostic:
2. Change mode back to RUN
mode OR
3. Force a cold-start
To clear the diagnostic, force a cold
start.
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 the firmware
4. Replace the CPU board.
5. Contact Honeywell Personnel.
Honeywell OI HCDesigner/HC
Indication Utilities Indication
In HCD,
"System
Diagnostics"
shows status as
"Invalid Change
of Mode"
In HCD,
"System
Diagnostics"
shows status as
"Safety
Configuration
mis match"
If the lead's status If the lead's status
LED is indicating LED is indicating
the failure, see the failure, see
CPU in the "Lead CPU Diagnostics
CPU Diagnostics" in the "Lead
display. Diagnostics
Overview" dialog
If the reserve's
box.
status LED is
indicating the If the reserve's
failure, see CPU in status LED is
the "Reserve CPU
indicating the
Diagnostics" failure, see CPU
display. Diagnostics in
the "Reserve
Diagnostics
Overview" dialog
box.
165