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
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.
122
Fieldbus I/O Rev.6
Содержание EM07ZS1647F
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