FD67 Profibus-DP Manual
60
7.5.2 Troubleshooting in the internal system connection
Besides defective cables or wrong connections, please check the following points :
♦
The connected I/O modules must be in accordance with planned modules in order to guarantee replaceability.
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The order of I/O modules must be in accordance with planned order.
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Connectors are screwed down.
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Use exclusively pre-wired Norgren cables.
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Connection of functional ground and shield according to EMC requirements.
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System extension is limited to 5 m per line.
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The max. number of modules per line is 4.
Error
DP Diagnosis
LED Display
Possible cause
Solution
Fault in the internal system connection
line.
Replace the line.
Internal system connection
interrupted
If the system was already in
data exchange mode,
communication error is reported
for all the modules that are no
more accessible.
If the module wasn't yet in data
exchange mode (startup),
PrmFault or CfgFault is
reported : planned configuration
is different from actual
configuration.
U
S
LED on the corresponding
I/O module is off.
Flashing U
S
LED of the
corresponding line on the bus
node.
Flashing U
S
LEDs of accessible
modules.
Wrong connection of the internal
system connection plug.
Screw down the plug.
Fault in the internal system connection
line.
Replace the line.
Wrong connection of the internal
system connection plug.
Screw down the plug.
Communcation error
If the system was already in
data exchange mode,
communication error is reported
for all the modules that are no
more accessible.
Flashing U
S
LED on I/O
module.
Flashing U
S
LED of the
corresponding line on the bus
node.
No termination on the internal system
connection line.
If the last I/O module in a line is an
expander module, the extension inferface
of the internal system connection must be
fitted with a terminal resistor.
The module is not supplied
See error "Internal system connection interrupted".
The sensor supply of the I/O module is
< 12 V.
Increase the sensor power supply
voltage. Please observe the max.
admissible values.
♦
Table 7-18 : Troubleshooting in the internal system connection