Epson RC620 Manual page 195

4.2.2.2 Master: Data Link Layer Error
Light
OFF
♦ Process Flowchart
Check
 No Problem
 No Change
 No Change
 The trouble unit is not found.
Rarely
RC620 Option Fieldbus I/O Rev.8
Master Unit LED
BF ST
Red Data link layer
Light ON error
6
Check the following:
- Unconnected terminating resistor
- Unconnected or loose connector/signal wire
- Cable disconnection
No problem
Replace moving cable.
(Replace deteriorated cable).
No change
Check for noise influence.
No change
Does an error occur immediately?
Immediately
Divide the network and
find the trouble unit.
The unit is not found.
Consult the PROFIBUS manufacturer.
4. Troubleshooting (PROFIBUS DP)
Error
- Nonstandard wiring
- Noise intrusion
Problem exists. (Fix it.)
See 4.2.3.1 and 4.2.3.2.
The problem is fixed.
The problem is fixed.
The unit is found.
Replace the unit.
Normal Communication?
No
Description
See 4.2.3.3.
Yes
Finish
185