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9 Troubleshooting and Maintenance
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
9-1 Troubleshooting with the DeviceNet Unit Indicators
9
9-1-2 Troubleshooting Errors
Occurring in the DeviceNet Unit
Status of C200H Master Replacement
Master Status 1
*_CMstrSta*_CMstrSta
Status of device variables
for CJ-series Units
Correction
- *_Slav1IO1Err (Remote I/O Communi-
cations Error for OUT1/IN1) or
*_Slav1IO2Err (Remote I/O Communi-
cations Error for OUT2/IN2) is TRUE
and *_UnitErr (Unit Error) and
*_SlavFunErr (Slave Function Flag) are
TRUE.
Check the following:
• Master Operation is normal
• Matching master and slave baud
rates
• Proper cable lengths (trunk and
branch lines)
• Broken or loose cables
• Installation of terminators only at
both ends of the trunk line
• Excessive noise
- - Restart Controller. Replace the
DeviceNet Unit if the error recurs.
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