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4. Troubleshooting (DeviceNet)
♦ Process Flowchart
Replace the unit.
5
No Problem
Check
Check the following:
- Unconnected terminating resistor
- Unconnected or loose connector/signal wire
- Cable disconnection
Finish
No Problem
No Change
No Change
No Change
The trouble unit is not found.
Rarely
Problem exists. (Fix it.)
No change
No change
No change
Immediately
The unit is not found.
The unit is found.
Problem exits. (Fix it.)
The problem is fixed.
The problem is fixed.
The problem is fixed.
No problem
No problem
See 4.1.3.1 and 4.1.3.2.
See 4.1.3.3.
Check for noise influence.
Divide the network and
find the trouble unit.
Does an error occur immediately?
Yes
No
Normal Communication?
Analyze the network with NetMeter.
Consult the DeviceNet manufacturer.
Measure voltage of
communications power supply.
Replace the master unit.
Replace moving cable
(Replace deteriorated cable).
Fieldbus I/O Rev.6 87