4. Troubleshooting (PROFIBUS DP)
♦
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
z
Measuring point: Connection of
the trouble unit
z
For detail, 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.
z
Checkpoint: all stations and all
branch taps
z
For details, refer to the section
4.2.3.2 Loose Connector and
Signal Wire
.
Connect the connectors and
signal wires again.
{
Broken unit
Replace the trouble unit with a
new one.
→
Verify whether the problem is
fixed.
Replace the unit with a
new one.
z
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
.
Fieldbus I/O Rev.6
129
Summary of Contents for EM07ZS1647F
Page 1: ...Rev 6 EM07ZS1647F EPSON RC Option Fieldbus I O ...
Page 2: ...E PSON RC Option Fieldbus I O Rev 6 ...
Page 8: ...vi Fieldbus I O Rev 6 ...
Page 12: ...Table of Contents x Fieldbus I O Rev 6 ...
Page 80: ...2 Installation 68 Fieldbus I O Rev 6 ...
Page 88: ...3 Operation 76 Fieldbus I O Rev 6 ...
Page 164: ...5 Maintenance Parts List 152 Fieldbus I O Rev 6 ...
Page 168: ...Appendix A applicomIO Upgrade 156 Fieldbus I O Rev 6 ...
