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Epson RC620 Manual Page 191

Robot controller option, fieldbus i/o.
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♦ Causes of Error
Possible Cause
 Disconnected
terminating resistors
 Cable disconnection
 Disconnected
 Disconnected signal
 Loose connector
 Loose signal wire
 Noise
(external cause)
 Broken unit
 No cause is
RC620 Option Fieldbus I/O Rev.8
Examination Method
(1) Check that terminating
resistors are connected to
both ends of the network.
(2) Measure resistance between
signal wires with device
power supply OFF.
→ Normal: 100 to 120 Ω
 Measuring point: Connection
of the trouble unit
 For details, refer to the section Connection Problem.
Check for the connection of
connectors and signal wires.
→ The connectors and signal
wires should be firmly connected.
 Checkpoint: all stations and all
branch taps
 For details, refer to the section Loose Connector and
Signal Wire.
Check the noise intrusion via the
following paths (1) to (3).
(1) Noise via shield
(2) Induced noise via
communication cable
(3) Device power supply
→ For details, refer to the section Noise Intrusion.
Replace the trouble unit with a
new one.
→ Verify whether the problem is
Identify the trouble point by
dividing the network.
→ For details, refer to the section Broken Unit
4. Troubleshooting (PROFIBUS DP)
Fix the problem.
How to find the trouble
Remove the terminating
resistor on one end of the
network. The trouble point
is where resistance
changes from 220 Ω.
Connect the connectors
and signal wires again.
Take countermeasures
against noise.
Replace the unit with a
new one.


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