Epson RC620 Manual page 192

4. Troubleshooting (PROFIBUS DP)
♦ Process Flowchart
Check
 No Problem
 No Problem
- Unconnected or loose connector/signal wire
 No Change
 No
182
Slave: Uninitialized Network
Master LED Condition
Absent Slave LED Condition
(Uninitialized Network)
4
Measure voltage of all
slave power supplies.
No problem
Check the following:
- Unconnected terminating resistor
- Cable disconnection
No problem
Replace moving cable.
(Replace deteriorated cable).
No change
Replace the unit.
Normal Communication?
No
Consult the PROFIBUS manufacturer.
BF
Light OFF
Light OFF
Problem exists. (Fix it.)
Problem exists. (Fix it.)
See 4.2.3.1 and 4.2.3.2.
The problem is fixed.
Yes
RC620 Option Fieldbus I/O Rev.8
ST
Red Light Blinking
Light OFF
Finish