Honeywell HC900 Installation And User Manual page 132

Diagnostics and Troubleshooting - User Interface
Table 27 - Controller Module Diagnostics
OI Screen OI Screen
Item Item Value
INVALID
CONFIG.
SWITCH
FAULT
SYSTEM NO MASTER
PORT
CPU GOOD
WATCHDOG
PREFETCH
ABORT
ADDRESS
ERROR
UNDEFINE
ERROR
122
Number of Possible Cause
LED
Strobes
2 A configuration that
exceeds the loop
capacity of the
controller was
downloaded or an
invalid configuration
exists.
2 A failure is detected in
the switch reading.
2 There are slave
blocks in the
configuration, and no
communication port
configured as a
Modbus master.
N/A N/A
3 Watchdog reset
resulting from
software failure
3 CPU failed when
attempting to fetch an
instruction from the
prefetch register.
3 The reserved
exception occurred for
an unknown reason.
3 Bad Instruction
Detected
HC900 Hybrid Controller Installation and User Guide
Control File Action
An empty database is
created.
1. All control blocks stop
running
2. All I/O scanning
ceases. This forces the
modules into failsafe.
1. MSTRFAIL pins on
ASYS and FSYS
blocks turn on.
2. All Modbus slave and
Modbus read blocks
freeze their output pins
to the last value.
3. All slave blocks have
their BAD COMM pin
on.
4. All slave blocks have
their NO SCAN pin on.
5. IN SCAN STATUS is
set to NO for all slaves.
6. COMM STATUS is set
to BAD for all slaves in
the function block
diagram.
7. Statistical counters for
all slaves are 0.
N/A
1. Associated rack
monitor block's RACK
OK pin is turned off.
2. ASYS block's HW OK
pin is turned off.
1. Controller performs a
restart
2. Associated rack
monitor block's RACK
OK pin is turned off.
3. ASYS block's HW OK
pin is turned off.
See PREFETCH
ABORT.
See PREFETCH
ABORT
User Action
Download a valid
configuration.
Replace CPU.
1. Configure one of the
ports as a master.
2. Download a
configuration that
has no slave blocks.
N/A
1. Force a cold start.
2. Upgrade control file
software.
3. Replace CPU board.
4. Contact Honeywell
Personnel.
1. Force a cold start.
2. Isolate system from
noise and force a
cold start.
3. Replace CPU board.
1. Force a cold start.
2. Isolate system from
noise and force a
cold start.
3. Replace CPU board.
See PREFETCH
Abort
Revision 5
9/03