LED Failure Definition
Number
of
strobes
Failure Description User Action
Applies
to
1 Failsafe The module is in
the failsafe state
because it is not
receiving
message
requests from
the CPU or the
whole system is
in exception
stop.
1. If expansion I/O rack, go to step
2. If non expansion I/O rack, go
to step 3.
2. Check the Scanner status LED If
it’s flashing 6 times, proceed
with step 3. If it’s flashing some
other red status code, refer to
Table 29 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.
3. Make sure the module is the
correct one for the
configuration.
4. Remove the module and check
for a bent pin, then reinsert the
module
5. Replace the module
6. Remove other modules and
replace one at a time until the
problem reoccurs. Most likely the
last module inserted needs to be
replaced.
7. Replace the rack.
All
modules
2 HW/SW
Key
The software
residing on the
module does
not match the
module type.
This diagnostic
should only
result in the
factory.
Replace module DI and
Relay
DO and
DC DO
174
Chapter 8 - Diagnostics and Troubleshooting
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