4. Troubleshooting (PROFIBUS DP)
304
RC700 / RC90 Option Fieldbus I/O Rev.14
♦
Causes of Error
Possible Cause
Examination Method
Countermeasure
Disconnected
terminating resistors
Cable disconnection
Disconnected
connector
Disconnected signal
wire
(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
4.2.3.1 Connection Problem
.
Fix the problem.
How to find the trouble
point:
Remove the terminating
resistor on one end of the
network.
The trouble point is where
resistance changes from
220
Ω
.
Loose connector
Loose signal wire
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
4.2.3.2 Loose Connector and
Signal Wire
.
Connect the connectors
and signal wires again.
Noise
(external cause)
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
4.2.3.3 Noise Intrusion
.
Take countermeasures
against noise.
Broken unit
Replace the trouble unit with a
new one.
→
Verify whether the problem is
fixed.
Replace the unit with a
new one.
No cause is
identified.
Identify the trouble point by
dividing the network.
→
For details, refer to the section
4.2.3.4 Broken Unit
Examination
.
Summary of Contents for RC700
Page 1: ...Robot Controller RC700 RC90 Option Fieldbus I O Rev 14 EM198C4088F ...
Page 2: ...Robot Controller RC700 RC90 Option Fieldbus I O Rev 14 ...
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