Omron CJ1W-SCU32 Operation Manual page 325

Event name Command Format Error
Meaning An illegal function code or address was specified in a received Modbus-RTU command.
Source PLC Function Module
Error attributes Level
Effects User program
System-defined Variable
variables
None
Cause and Assumed cause
correction
An illegal function code, address, or
data was specified in a received Mod-
bus-RTU command.
Attached Attached information 1: Port number where error was detected
information
Precautions/ None
Remarks
Event name Transmission Error
Meaning A transmission error occurred.
Source PLC Function Module
Error attributes Level
Effects User program
System-defined Variable
variables
None
Cause and Assumed cause
correction
One of the following errors occurred.
• Tfs (Send Finished Monitoring
Time) Exceeded
• Tfr (Receive Finished Monitoring
Time) Exceeded
• Tr (Receive Wait Monitoring Time)
Exceeded
• FCS Check Error
• Command Error
• Timeout Error
• Overrun Error
• Framing Error
• Parity Error
Attached Attached information 1: Port number where error was detected
information
Precautions/ In Protocol Macro Mode, this error does not occur if communications recover within the specified number of retries.
Remarks
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Source details
Observation Recovery
Continues. Operation
Data type
---
Correction
Check the format of the Modbus-RTU
command and correct the Modbus-
RTU command at the device that sent
the Modbus-RTU command.
Source details
Observation Recovery
Continues. Operation
Data type
---
Correction
See which error occurs from the Sys-
mac Studio or an NS-series PT and
take suitable measures.
9 Troubleshooting and Maintenance
Event code 64A70000 hex
CJ-series Unit Detection
timing
--- Log category
Not affected.
Name
---
Prevention
Check the format of the Modbus-RTU
command to create a Modbus-RTU
command.
Event code 84680000 hex
CJ-series Unit Detection
timing
--- Log category
Not affected.
Name
---
Prevention
Refer to the measures for the errors
listed as causes to prevent the errors
from occurring.
During Modbus-
RTU Slave Mode
System
After serial com-
munications start
System
9
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