9-9
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
*_CMstrStruErr (Structure Error) are
TRUE.
*_Mstr1StruErr (Structure Error),
*_UnitErr (Unit Error) and *_MstrFunErr
(Master Function Error) are TRUE.
Use slaves with input and output
areas of 200 bytes max.
*_CMstrErr (Master Error) and
*_CMstrVefyErr (Verification Error) are
TRUE.
*_Mstr1VefyErr (Verification Error),
*_UnitErr (Unit Error) and *_MstrFunErr
(Master Function 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
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