Omron CJ1W-SCU32 Operation Manual page 330

9 Troubleshooting and Maintenance
Event name Transmission Error (CRC Error)
Meaning A CRC error occurred.
Source PLC Function Module
Error attributes Level
Effects User program
System-defined Variable
variables
None
Cause and Assumed cause
correction
Noise
CRC calculation method does not
match the device.
Attached Attached information 1: Port number where error was detected
information
Precautions/ You can check the number of transmission errors (i.e., CRC errors) in the *_P1_MbsCRCErrCnt and
Remarks *_P2_MbsCRCErrCnt device variables.
9-52
Source details
Observation Recovery
Continues. Operation
Data type
---
Correction
Implement noise countermeasures.
Correct the CRC calculation method
in the user application to match the
Modbus specifications.
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Event code 846D 0000 hex
CJ-series Unit Detection
timing
--- Log category
Not affected.
Name
---
Prevention
Use the Unit away from sources of
noise. Implement noise countermea-
sures.
Set the CRC calculation method in
the user application to match the
Modbus specifications.
After serial com-
munications start
System