Omron CJ1W-PNT21 Operation Manual page 135

Troubleshooting using the IO Controller indicators
Backplane bus error
7-segment
H7
Cyclic refresh monitor
timeout
7-segment
HE
Watchdog timer error
7-segment
H7
/i
MS indicator
Flashing (red)
Likely cause
The PROFINET lO Controller detected that an error on the backplane bus.
IO Controller Unit response
The Unit will stop processing. Records the error in the error log. (The time
information is set to all zeroes.)
CIO Area Flags allocated to the IO Controller Unit
None of the bits is set.
Correction
Replace the CPU Unit if the error recurs when the CPU Unit is restarted.
/i
MS indicator
Flashing (red)
Likely cause
During normal operation the cyclic refresh to the PLC CPU timed out.
IO Controller Unit response
The Unit will stop processing. Records the error in the error log.
CIO Area Flags allocated to the IO Controller Unit
None of the bits is set.
Correction
Replace the CPU Unit if the error recurs when the CPU Unit is restarted.
/i
MS indicator
Flashing (red)
Likely cause
The PROFINET lO Controller detected a watchdog timer error with the PLC
CPU unit.
IO Controller Unit response
The Unit will stop processing. Records the error in the error log.
CIO Area Flags allocated to the IO Controller Unit
None of the bits is set.
Correction
Replace the CPU Unit if the error recurs when the CPU Unit is restarted.
NS indicator
OFF
NS indicator
OFF
NS indicator
OFF
Section 8-2
Error log (Hex)
--
Error log (Hex)
0001
Error log (Hex)
0002
121