Omron CJ1W-SCU32 Operation Manual page 324

9 Troubleshooting and Maintenance
Event name Comparison Error
Meaning A comparison error occurred.
Source PLC Function Module
Error attributes Level
Effects User program
System-defined Variable
variables
None
Cause and Assumed cause
correction
Loopback test jig failure.
Noise
The communications circuits in the
Serial Communications Unit are
faulty.
Attached Attached information 1: Port number where error was detected
information
Precautions/ None
Remarks
Event name Reception Overflow
Meaning More than the specified amount of receive data was received in No-protocol Mode.
Source PLC Function Module
Error attributes Level
Effects User program
System-defined Variable
variables
None
Cause and Assumed cause
correction
One or more bytes of data was
received after the completion the
reception.
Attached Attached information 1: Port number where error was detected
information
Precautions/ None
Remarks
9-46
Source details
Observation Recovery
Continues. Operation
Data type
---
Correction
Correct any mistakes in wiring the
loopback test jig.
Implement noise countermeasures.
Replace the Unit.
Source details
Observation Recovery
Continues. Operation
Data type
---
Correction
Execute the SerialRcv/SerialRcvNo-
Clear instruction again after the
Reception Completed Flag changes
to TRUE.
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Event code 64A5 0000 hex
CJ-series Unit Detection
timing
--- Log category
Not affected.
Name
---
Prevention
Check the wiring of the loopback test
jig.
Use the Unit away from sources of
noise. Implement noise countermea-
sures.
None
Event code 64A6 0000 hex
CJ-series Unit Detection
timing
--- Log category
Not affected.
Name
---
Prevention
Review the communications period
with the remote device.
During Loopback
Test
System
During No-proto-
col Mode
System