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Status of C200H Master Replacement
Master Status 1
*_CMstrSta*_CMstrSta
*_CMstrErr (Master Error) and
*_CMstrNdDupErr (Node Address Dupli-
cated/Bus Off Error) are TRUE.
*_CMstrErr (Master Error) and
*_CMstrNdDupErr (Node Address Dupli-
cated/Bus Off Error) are TRUE.
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CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
Status of device variables
for CJ-series Units
*_UnitErr (Unit Error) and
*_NdAdrDupErr (Node Address Dupli-
cated) are TRUE.
*_UnitErr (Unit Error) and *_BusoffErr
(Bus Off Error) are TRUE.
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9 Troubleshooting and Maintenance
Correction
Check the node addresses set on
other nodes in the network. Correct
the settings to eliminate the duplica-
tion and restart the DeviceNet Units.
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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9-21
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Table of Contents
Troubleshooting
