4. Troubleshooting (PROFIBUS DP)
♦ Process Flowchart
Replace the unit.
1
No Problem
Check
Check the following:
- Unconnected terminating resistor
- Unconnected or loose connector/signal wire
- Cable disconnection
2
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.
Yes
Problem exists. (Fix it.)
The problem is fixed.
The problem is fixed.
The problem is fixed.
No
No problem
No problem
See 4.2.3.1 and 4.2.3.2.
Replace the trouble unit.
See 4.2.3.3.
Check for noise influence.
Does an error occur immediately?
Divide the network and
find the trouble unit.
Normal Communication?
Consult the PROFIBUS manufacturer.
Measure voltage of all
slave power supplies.
Replace moving cable.
(Replace deteriorated cable).
Fieldbus I/O Rev.6 117