Epson RC700 Manual page 226

4. Troubleshooting (DeviceNet)
♦ Process Flowchart
Check for cable laying.
Check that
terminating resistors
are connected.
Normal
Turn OFF communications power supply.
Measure resistance
with tester.
50 to 70 Ω
Normal
See 4.1.3.2.
216
Problem exists.
(Add terminating resistors.)
Out of 50 to 70 Ω (Error)
Resistance: over 70 Ω
Yes
Remove one terminating
resistor on either side.
Measure
Approx.
resistance at
Ω
120
connectors and
branch taps with
tester.
Other
Find the trouble point.
(1) Unconnected or loose connector
(2) Cable disconnection, etc.
No
Resistance: under 50 Ω
Ω
10 to 50
Check for connection
with terminating resistors
and branch taps.
(1) Three or more
terminating resistors
(2) Wrong terminating
resistors, etc.
RC700 / RC90 Option Fieldbus I/O Rev.12
Under 10 Ω
Check for short
circuit between
signal wires.
Short circuit
between signal
wires