Epson RC90 Manual page 279

♦ Process Flowchart
Check
 No Problem
 No Problem
 No Change
 No Change
 No Change
 The trouble unit is not found.
Rarely
RC700 / RC90 Option Fieldbus I/O Rev.14
5
Check the following:
- Unconnected terminating resistor
- Unconnected or loose connector/signal wire
- Cable disconnection
No problem
Measure voltage of
communications power supply.
No problem
Replace the master unit.
No change
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.
 Analyze the network with NetMeter.
 Consult the DeviceNet manufacturer.
4. Troubleshooting (DeviceNet)
Problem exists. (Fix it.)
See 4.1.3.1 and 4.1.3.2.
Problem exits. (Fix it.)
The problem is fixed.
The problem is fixed.
The problem is fixed.
See 4.1.3.3.
The unit is found.
Replace the unit.
Normal Communication?
No
Yes
Finish
267