Table 31 - I/O Module Led Diagnostics - Honeywell HC900 Installation And User Manual

Diagnostics and Troubleshooting - I/O Module Indicators
I/O Module Diagnostic Indication
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. Table 31 outlines the potential module diagnostics.
Number of Fai l u re Descri p tion
Strobes
1 FAIL SAFE The module is in the failsafe state
because it is not receiving message
requests from the CPU or Scanner
at a rate that satisfies the configured
failsafe timeout.
2 EAROM EA ROM Failed its checksum
3 RAM
4 ROM
5 +24 V
6 FACTORY CAL CRC failure of primary and backup
factory calibration
7 FIELD CAL CRC failure of field calibration
values
8 HARDWARE General Hardware Failure
(AI=convertor not working)
9 HW/SW Key The software residing on the
module does not match the module
type. This diagnostic should only
result in the factory.
11 Shift Register The loopback test of the shift
register failed.
176
Table 31 – I/O Module LED Diagnostics
AI AO DI
Contact AC DC Relay AC DC
√ √ √
√ √
√ √ √
√ √
√ √ √
√ √
√ √
√
√
√
HC900 Process Controller Installation and User Guide
DO PFQ User Action
√ √ √ √ √ √
1.
2.
3.
4.
5.
6.
7. Replace the rack.
1. Remove/reinsert module.
2. Replace module.
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√ √ √ √ √
√
1. Remove the module and check
2. Measure power supply voltage. If
3. Replace module
4. Replace rack
Replace module.
1. Remove/reinsert module.
2. Replace module.
Replace module.
√ √ √ √
Replace module
√ √ √ √ √
Replace module
If expansion I/O rack, go to step 2.
If no expansion I/O rack, go to
step 3.
Check the Scanner status LED
(see p. 171).
If it's flashing 6 times, proceed
with step 3.
If it's flashing some other red
Table 29
status code, refer to
to solve that problem first.
If it's flashing green, the module
probably is not required in the
configuration.
If it's not on or steady, cycle
power to the scanner.
Make sure the module is the
correct one for the configuration.
Remove the module and check
for a bent pin, then reinsert the
module
Replace the module
Remove other modules and
replace one at a time until the
problem reoccurs. Most likely the
last module inserted needs to be
replaced.
for a bent pin, then reinsert the
module
not correct, replace power supply.
Revision 19
06/14