9-15
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
*_CMstrSendErr (Send Error) are TRUE.
*_SendTimeoutErr (Send Timeout
Error) and *_UnitErr (Unit 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
*_CMstrErr (Master Error) and
*_CMstrCfgErr (Configuration Error) are
TRUE.
*_UnitErr (Unit Error) and *_MsgListErr
(Invalid Message Timer List Error) are
TRUE.
Use the CX-Integrator to register the
message monitoring timer list again.
- *_UnitErr (Unit Error), *_SlavFunErr
(Slave Function Error) and *_MemErr
(Unit Memory Error) are TRUE.
Disable the slave, reset the alloca-
tions, and then enable the slave again
or use the CX-Integrator to reset the
slave scan list.
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