Omron CJ Series Operation Manual page 84

1 Overview and Features
Error Descriptions
Event name A/D Conversion Error
Meaning An error occurred in A/D conversion.
Source PLC Function Module
Error attributes Level
Effects User program
System-defined Variable
variables
None
Cause and Assumed cause
correction
There is a source of noise nearby.
A/D converter failure.
Attached None
information
Precautions/ PH41U: If this error occurs three periods in a row, there is an error in the Special I/O Unit. You can change the event
Remarks level to the observation level. If you change the level to the observation level, recovery procedures are not required.
Event name Cold Junction Sensor Error
Meaning An error occurred in the cold junction sensor.
Source PLC Function Module
Error attributes Level
Effects User program
System-defined Variable
variables
None
Cause and Assumed cause
correction
Faulty connection to the cold junction
sensor for the CJ1W-PH41U.
The cold junction sensor failed.
Attached CJ1W-AD04U: Input number where error was detected, CJ1W-PH41U: None
information
Precautions/ You can change the event level to the observation level. If you change the level to the observation level, recovery proce-
Remarks dures are not required.
1-48
Source details
Minor fault Recovery
Continues. Operation
Data type
---
Correction
Implement noise countermeasures.
If the above cause does not apply,
replace the Unit.
Source details
Minor fault Recovery
Continues. Operation
Data type
---
Correction
Check the connection of the cold
junction sensor (i.e., terminal block)
and reconnect it if the connection is
faulty.
Replace the Unit.
CJ-series Analog I/O Units Operation Manual for NJ-series CPU Unit(W498)
Event code 0460 0000 hex
CJ-series Unit Detection
timing
Cycle the power Log category
supply.
Immediately previous values are held in the Unit and data
is not updated.
Name
---
Prevention
Use the Unit away from sources of
noise. Implement noise countermea-
sures.
None
Event code 0461 0000 hex
CJ-series Unit Detection
timing
Cycle the power Log category
supply.
The measurement value for the input will not include cold-
junction compensation.
Name
---
Prevention
Securely connect the cold junction
sensor (i.e., terminal block).
None
Continuously
System
Continuously
System