Honeywell 900U02-0100 - Page 204

190 ControlEdge HC900 Process & Safety Controller User and Installation Manual Revision 10
May 2019
Number
of Red
Strobes
Possible Causes
Lead and/or Reserve
Controller Action(s)
User Action
Honeywell OI
Indication
HCDesigner/HC
Utilities
Indication
2
There are slave
blocks in the
configuration, and
no communication
port is configured as
a Modbus master.
 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.
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.
2
Controller mode is
changed to RUN-
Locked while there
are forces present
on safety
worksheet.
 Controller will not go to
RUN-Locked mode.
To clear the diagnostic:
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
In HCD,
"System
Diagnostics"
shows status as
"Invalid Change
of Mode"
2
Controller mode is
changed to RUN-
Locked when safety
configuration is
changed at run-
time.
 Controller will not go to
RUN-Locked mode.
7. To clear the diagnostic:
8. 1. Change mode back to RUN
mode OR
2. Force a cold-start
In HCD,
"System
Diagnostics"
shows status as
"Safety
Configuration
mis match"
3
One of the following
microprocessor
exceptions
occurred:
 Watchdog timer
timeout
 Address error
 Prefetch error
 Data abort error
 Software
interrupt
 Undefined
instruction error
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.
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.
If the lead’s
status LED is
indicating the
failure, see CPU
in the “Lead
CPU
Diagnostics”
display.
If the reserve’s
status LED is
indicating the
failure, see CPU
in the “Reserve
CPU
Diagnostics”
display.
If the lead’s
status LED is
indicating the
failure, see CPU
Diagnostics in
the “Lead
Diagnostics
Overview”
dialog box.
If the reserve’s
status LED is
indicating the
failure, see CPU
Diagnostics in
the “Reserve
Diagnostics
Overview”
dialog box.