4. Troubleshooting (PROFIBUS DP)
4.2.2.2 Master: Data Link Layer Error
Master Unit LED
BF ST Error Description
Light
OFF
Red
Light ON
Data link layer
error
- Nonstandard wiring
- Noise intrusion
♦ Process Flowchart
Replace the unit.
6
No Problem
Check
Check the following:
- Unconnected terminating resistor
- Unconnected or loose connector/signal wire
- Cable disconnection
Finish
No Change
No Change
The trouble unit is not found.
Rarely
Problem exists. (Fix it.)
No problem
No change
No change
Immediately
The unit is not found.
The unit is found.
Yes
The problem is fixed.
The problem is fixed.
No
See 4.2.3.1 and 4.2.3.2.
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.
Replace moving cable.
(Replace deteriorated cable).
124 Fieldbus I/O Rev.6