Omron CJ1W-SCU32 Operation Manual page 328

9 Troubleshooting and Maintenance
Event name Parity Error
Meaning A parity error occurred.
Source PLC Function Module
Error attributes Level
Effects User program
System-defined Variable
variables
None
Cause and Assumed cause
correction
In Serial Gateway Mode or Protocol
Macro Mode:
• The reception circuits in the Serial
Communications Unit are faulty.
• A transmission error occurred due
to noise or other factors.
During Loopback Test
• 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
9-50
Source details
Observation Recovery
Continues. Operation
Data type
---
Correction
• Perform a loopback test in the serial
communications mode and check
the transmission lines. If an error
occurs during testing, replace the
Serial Communications Unit.
• Implement noise countermeasures.
Increase the setting for the number
of resends in the device that sent
the command. If required, perform
retry processing for communica-
tions.
• Correct any mistakes in wiring the
loopback test jig.
• Implement noise countermeasures.
• Replace the Unit.
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Event code 846B 0000 hex
CJ-series Unit Detection
timing
--- Log category
Not affected.
Name
---
Prevention
Perform countermeasures in
advance.
• Check the wiring of the loopback
test jig.
• Use the Unit away from sources of
noise. Implement noise counter-
measures.
After serial com-
munications start
System