Honeywell HC900 Benutzerhandbuch
Diagnostics and Troubleshooting - User Interface
Revision 5
HC900 Hybrid Controller Installation and User Guide
133
9/03
I/O Module Diagnostics
To indicate the type of diagnostic failure, the module’s status LED is flashed red with a number of quick
strobes followed by a long off time. The table below outlines the potential module diagnostics.
strobes followed by a long off time. The table below outlines the potential module diagnostics.
Table 28 - Bad Module Diagnostics
DI DO
Failure Description
AI
AO
Con-
tact
tact
CAC DC Re-
lay
AC DC
# of
Strobes
Strobes
User Action
FAIL SAFE
The module is in the
failsafe state because
it is not receiving
message requests
from the main
CPU/Scanner at a
rate equal to the
value configured for
its failsafe timeout.
failsafe state because
it is not receiving
message requests
from the main
CPU/Scanner at a
rate equal to the
value configured for
its failsafe timeout.
√ √ √
√
√ √
√
√
1
1. If expansion rack(C50 CPU only), check
communication link connection to main CPU
2. Remove the module and check for a bent
pin, then reinsert the module.
3. Measure Power Supply voltage; if not within
specifications, replace the power supply.
4. Replace the I/O Module.
5. Remove other modules and replace one at a
5. Remove other modules and replace one at a
time until the problem reoccurs. Most likely
the last module inserted needs to be
replaced.
the last module inserted needs to be
replaced.
6. Replace the rack.
EAROM
EA ROM Failed its
checksum
checksum
√ √ 2 Replace
Module
RAM
√ √ 3 Replace
Module
ROM
4
+24 V
√ √ √
√
5
1. Remove the module and check for a bent
pin, then reinsert the module.
2. Replace module.
3. Measure 24V at test points on Power Supply.
3. Measure 24V at test points on Power Supply.
If below 21.6V, replace Power Supply.
4. Replace Rack.
FACTORY CAL
CRC failure of
primary and backup
factory calibration
primary and backup
factory calibration
√
√ 6 Replace
Module.
FIELD CAL
CRC failure of field
calibration values
calibration values
√ √
7
None; controller will switch card to Factory Cal.
HARDWARE General
Hardware
Failure (AI=convertor
not working)
not working)
√ 8 Replace
module.
HW/SW Key
The software residing
on the module does
not match the module
type. This diagnostic
should only result in
the factory.
on the module does
not match the module
type. This diagnostic
should only result in
the factory.
√
√
√ √
√
√
9 Replace
module.
Shift Register
The loopback test of
the shift register
failed.
the shift register
failed.
√
√
√ √
√
√
11 Replace
module.