Table 28 - Bad Module Diagnostics; I/O Module Diagnostics - Honeywell HC900 Installation And User Manual

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.
Failure Description
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.
EAROM EA ROM Failed its
checksum
RAM
ROM
+24 V
FACTORY CAL CRC failure of
primary and backup
factory calibration
FIELD CAL CRC failure of field
calibration values
HARDWARE General Hardware
Failure (AI=convertor
not working)
HW/SW Key The software residing
on the module does
not match the module
type. This diagnostic
should only result in
the factory.
Shift Register The loopback test of
the shift register
failed.
Revision 5
9/03

Table 28 - Bad Module Diagnostics

AI AO DI DO
Con- CAC DC Re-
tact lay
√ √ √ √ √ √
√ √
√ √
√ √ √ √
√ √
√ √
√
√ √ √ √
√ √ √ √
HC900 Hybrid Controller Installation and User Guide
Diagnostics and Troubleshooting - User Interface
# of User Action
Strobes
AC DC
√ √
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
time until the problem reoccurs. Most likely
the last module inserted needs to be
replaced.
6. Replace the rack.
2 Replace Module
3 Replace Module
4
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.
If below 21.6V, replace Power Supply.
4. Replace Rack.
6 Replace Module.
7 None; controller will switch card to Factory Cal.
8 Replace module.
√ √
9 Replace module.
√ √ 11 Replace module.
133