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.
{
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.
{
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.
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
.
118
Fieldbus I/O Rev.6
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