Epson RC620 Manual page 190

4. Troubleshooting (PROFIBUS DP)
Slave: Data Link Error
♦ Process Flowchart
Check
 No Problem
 No Change
 No Change
 The trouble unit is not found.
Rarely
180
Master LED Condition
Absent Slave LED Condition
(Data link error)
3
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.
MS
Light OFF
Light OFF
Problem exists. (Fix it.)
See 4.2.3.1 and 4.2.3.2.
The problem is fixed.
The problem is fixed.
See 4.2.3.3.
The unit is found.
Replace the unit.
Normal Communication?
No
RC620 Option Fieldbus I/O Rev.8
NS
Red Light Blinking
Red Light ON
Yes
Finish