Table 33 - I/O Module Led Diagnostics - Honeywell 900U02-0100 User And Installation Manual

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 33 outlines the potential module diagnostics.
Hazardous voltages exist at terminal blocks.
AO8 and AO16 modules require at least one channel to be configured prior to a cold start for the module
to work properly. Subsequent channels then may be added with a hot start.
Failure to comply with these instructions could result in death or serious injury.
Number Failure Description
of
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
Field faults Field power supply
failures, Line monitor
faults
4 ROM
Revision 10 ControlEdge HC900 Process & Safety Controller User and Installation Manual
May 2019
Table 33 – I/O Module LED Diagnostics
UIO AI AO DI
Contact AC DC
  
Gas
Analyzer

 
  

 
DO
Relay AC DC
    
    
    
PFQ User Action

If expansion I/O rack, go to
1.
step 2. If no expansion I/O
rack, go to step 3.
Check the Scanner status
2.
LED (see p. 191).
If it's flashing 6 times,
proceed with step 3.
If it's flashing some other
red status code, refer to
Table 31 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
3.
correct one for the
configuration.
Remove the module and
4.
check for a bent pin, then
reinsert the module
Replace the module
5.
Remove other modules and
6.
replace one at a time until the
problem reoccurs. Most likely
the last module inserted
needs to be replaced.
Replace the rack.
7.
1. Remove/reinsert module.
2. Replace module.

1. Repair field power
supply/connection
2. Repair field wiring
3. Replace module
1. Remove/reinsert module.
2. Replace module.
203