4. Troubleshooting (DeviceNet) ♦ Process Flowchart
7
Check
Finish
The unit is not found.
Immediately
The unit is found.
Yes
No Change
No change
The problem is fixed.
No Change The problem is fixed.
Replace the master unit.
No Problem
Problem exists. (Fix it.)
Measure voltage of
communications power supply.
Rarely
No change
Does an error occur immediately?
No Change
No change
The problem is fixed.
Check for noise influence.
Replace the unit.
No
Normal Communication?
Check the following:
- Unconnected terminating resistor
- Unconnected or loose connector/signal wire
- Cable disconnection
No Problem
Problem exists. (Fix it.)
No Problem
Check for master unit
configuration (scan list configuration).
The problem is fixed.
The trouble unit is not found.
No problem
No problem
No problem
Divide the network and
find the trouble unit.
Analyze the network with NetMeter.
Consult the DeviceNet manufacturer.
See 4.1.3.1 and 4.1.3.2.
See 4.1.3.3.
Replace moving cable
(Replace deteriorated cable).
92 Fieldbus I/O Rev.6