Epson EM07ZS1647F Network Card User Manual


 
4. Troubleshooting (PROFIBUS DP)
Causes of Error
Possible Cause Examination Method Countermeasure
{ Electrical surges of
device power supply
Measure voltage of device
power supply at the trouble
unit.
It should be within the range
of sufficient voltage for
device operation.
Check voltage of the device
power supply.
{ 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
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
.
{ 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.
122 Fieldbus I/O Rev.6