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6
Troubleshooting
6.1
Error Detection via Status Indicators
For the meaning of the LEDs on the controller panel, refer to Status Indicators.
The LEDs on the slot bracket correspond to the status indicators of the LEDs on
the controller panel :
•
SF corresponds to INTF and EXTF
•
R corresponds to RUN
•
S corresponds to STOP
Troubleshooting Network Problems
The controller panel provides the EXTF and BUSF status indicators that can be
used to diagnose problems with the PROFIBUS-DP network. The table below
describes the activity of the EXTF and BUSF indicators based on the particular
error. In addition, possible remedies are provided.
EXTF
Off
On
—
On
In addition to these visual indicators, you can use the Diagnose Hardware feature
of the STEP 7 programming software to determine which nodes are experiencing
problems and to determine the nature of the problem.
Windows Automation Center, WinAC Slot Version 4.0
Hardware Installation and Operating Manual, Edition 02/2006, A5E00273194-02
BUSF
Description
Off
No
configuration
Normal
operation
Flashing
Station failure
At least one of
the DP slaves
could not be
accessed
On
Bus fault
(hardware
failure)
Off
Diagnostic
error
Action
Ensure that the DP configuration has been
entered into your STEP 7 project. Download
the project's System Data container to the
controller.
The configured DP slaves are responding. No
action is required.
Check to see that the bus cable is connected
to the MPI/DP port of the CPU 41x-2 PCI and
that all segments are correctly terminated at
powered nodes.
Check to see that the bus is not interrupted.
Wait for completion of the power-on cycle. If
the indicator continues to flash, check the DP
slaves or evaluate the diagnostic data for the
DP slaves.
Check the bus cable for an electrical short, or a
broken wire or connection.
Indicates that a fault condition has not been
cleared or that a DP module with diagnostic
capability has initiated OB 82.
85
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