Epson RC90 Manual page 321

Robot controller option fieldbus i/o
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♦ Process Flowchart
Check for cable laying.
Check that
terminating resistors
are connected.
Normal
Turn OFF all units.
Measure resistance
with tester.
100 to 120 Ω
Normal
See 4.2.3.2.
RC700 / RC90 Option Fieldbus I/O Rev.14
Problem exists.
(Add terminating resistors.)
Out of 100 to 120 Ω (Error)
Resistance: over 120 Ω
Yes
Remove one terminating
resistor on either side.
Approx.
Measure
220
resistance at
connectors
with tester.
Other
Find the trouble point.
(1) Unconnected or loose connector
(2) Cable disconnection, etc.
4. Troubleshooting (PROFIBUS DP)
No
Resistance: under 100 Ω
10 to 100 Ω
Check for connection
of terminating resistors.
(1) Three or more
terminating resistors
(2) Wrong terminating
resistors, etc.
Under 10 Ω
Check for short
circuit between
signal wires.
Short circuit
between signal
wires
309

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