Omron CS1W-CRM21 - Exception Processing

174
Handling Errors Section 8-1
Exception Processing
Indicators
: Lit
: Flashing
: Not lit
---: Not applicable
Errors in PLC Monitoring
Indicators
: Lit
: Flashing
: Not lit
---: Not applicable
MS
indicator
NS
indicator
7-segment
display
Item Error
history
(hex)
Probable cause of
error
Unit operation after error
detection
Countermeasures
Red
Not lit
Unit-related error
0601
Special I/O Unit
error
After the error is registered in
the error history, WDT refresh-
ing is stopped and the Master
Unit completely stops.
There may be some noise inter-
ference occurring. Eliminate the
source of the noise and then
turn ON the power to the PLC
again.
Red
Not lit
Unit WDT error
---
There was a WDT
timeout for the Unit.
The Master Unit completely
stops.
MS
indicator
NS
indicator
7-segment
display
Item Error
history
(hex)
Probable cause of error Unit operation after error
detection
Countermeasures
--- --- ---
Fatal CPU Unit
error
---
The CPU Unit Fatal Error Bit
is ON for the Unit status
information in the cyclic
area.
System operation continues
and the I/O cycle is stopped.
Check and clear the error in
the CPU Unit. When the
Fatal Error Bit turns OFF,
operation will automatically
recover.
--- --- ---
Load OFF
---
The Load OFF Bit is ON in
the Unit status information
in the cyclic area.
System operation continues
and the I/O cycle is stopped.
Load OFF Bit monitoring
continues. After recovery,
normal operation is restored.
Check the situation at the
CPU Unit. When the Load
OFF Bit turns OFF, operation
will automatically recover.
Note This occurrence is not
an error.
Red
--- H9
Bus error
000E
An error occurred in the bus
for exchanging data with the
CPU Unit.
• Cyclic operations are
stopped.
• The communications cycle
is stopped.
Restart the PLC by cycling
the power.
Red
--- HF
CPU Unit WDT
error
0001
An error occurred at the
CPU Unit, and CPU Unit
operations stopped.
The error is registered in the
error history. System opera-
tion continues, but the com-
munications cycle is
stopped.
Clear the error in the CPU
Unit, and then restart the
Master Unit.
Not lit
Power failure
---
The CPU Unit power supply
is down.
System operation is com-
pletely stopped by a hard-
ware reset.
Clear the cause of the failure
and turn ON the power
again.
Red
--- HE
CPU Unit moni-
toring error
0002
Service from the CPU Unit
is irregular. The monitoring
time is acquired at initializa-
tion. Normally monitoring is
for 11 s.
The error is registered in the
error history. (It is registered
only once even though the
error continues.)
• The I/O cycle is stopped.
• Cyclic operations are
stopped.
• The final data is provided
to an output Slave Unit.
There is a possibility of
recovery from this error,
restoring normal operations.
Check the CPU Unit operat-
ing environment.