9-21
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
*_CMstrErr (Master Error) and
*_CMstrNdDupErr (Node Address Dupli-
cated/Bus Off Error) are TRUE.
*_UnitErr (Unit Error) and
*_NdAdrDupErr (Node Address Dupli-
cated) are TRUE.
Check the node addresses set on
other nodes in the network. Correct
the settings to eliminate the duplica-
tion and restart the DeviceNet Units.
*_CMstrErr (Master Error) and
*_CMstrNdDupErr (Node Address Dupli-
cated/Bus Off Error) are TRUE.
*_UnitErr (Unit Error) and *_BusoffErr
(Bus Off Error) are TRUE.
Check the following:
• 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
- - Set the unit numbers correctly and
restart the DeviceNet Units.
- - Replace the CPU Unit if the error
recurs when the Controller is
restarted.
- - Replace the DeviceNet Unit if the
same error recurs when the Unit is
mounted to another CPU Unit.
- - Set the node address correctly and
restart the DeviceNet Units.
- - Set the communications speed cor-
rectly and restart the DeviceNet Units.
- - Replace the CPU Unit if the error
recurs when the Controller is
restarted.
- - Create the Unit Configuration in which
the Unit is registered to.
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