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Troubleshooting with the DeviceNet Unit Indicators Section 9-1
DeviceNet Unit Response
Records the error in the error log.
• The Unit will go off–line and communications will be disabled. Error
responses will be returned to all communications requests.
• The exchange of data with the CPU Unit will continue.
Flags Allocated for C200H DeviceNet Master Unit (CIO n+24)
Bit 14 (Error Flag) and bit 01 (the Node Address Duplicated/Bus Off Flag) will
be ON.
CIO Area Flags Allocated to DeviceNet Unit
Bits 00 and 06 of n+10 (the Unit Error Flag and Duplicated Node Address
Flag) will be ON.
Correction
Check the node addresses set on other nodes in the network. Correct the set-
tings to eliminate the duplication and restart the DeviceNet Units.
Bus Off Detected
Likely Cause
A Bus Off condition was detected.
DeviceNet Unit Response
Records the error in the error log.
• The Unit will go off–line and communications will be disabled. Error
responses will be returned to all communications requests.
• The exchange of data with the CPU Unit will continue.
Flags Allocated for C200H DeviceNet Master Unit (CIO n+24)
Bit 14 (Error Flag) and bit 01 (the Node Address Duplicated/Bus Off Flag) will
be ON.
CIO Area Flags Allocated to DeviceNet Unit
Bits 00 and 05 of n+10 (the Unit Error Flag and Bus Off Flag) will be ON.
Correction
Check the following:
• Matching master and slave baud rates
• Proper cable lengths (trunk and branch lines)
• Broken or loose cables
• Installation of terminators at both ends of the trunk line
• Excessive noise
Memory Access Errors
Message Monitoring
Timer List Logic Error
Likely Cause
There is an error in the contents of the message monitoring timer list stored in
non-volatile memory.
7-segment MS indicator NS indicator Error log (Hex)
F1 --- Red (lit) 0340
7-segment MS indicator NS indicator Error log (Hex)
E6 Red (flashing) --- 021A
