Epson EM07ZS1647F - Manual (Page 141)

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