The Busf Led Flashes - Siemens SIMATIC S7-300 Hardware And Installation Manual

Table 11-7

The BUSF LED flashes

Possible Errors
The CPU is the DP master/active
slave:
•
Failure of a connected station
•
At least one of the configured
slaves cannot be accessed.
•
Incorrect configuration
The CPU is the DP slave
CPU 31x was programmed
incorrectly. Possible causes:
•
The response monitoring time
has expired.
•
PROFIBUS DP
communication is interrupted.
•
Wrong PROFIBUS address.
•
Incorrect configuration
S7-300 Programmable Controller Hardware and Installation
A5E00105492-02
Testing functions, Diagnostics and Fault Elimination
response of the CPU
Calls OB 86 (when CPU is in
RUN mode). CPU switches to
STOP if OB 86 is not loaded.86
Calls OB 86 (when CPU is in
RUN mode).
CPU switches to STOP if OB 86
is not loaded.86
Remedies
Ensure that the bus cable is
connected to the CPU and that
the bus is not interrupted.
Wait until the CPU has started. If
the LED does not stop flashing,
check the DP slaves or evaluate
the diagnostic data for the DP
slaves.
•
Check the CPU.
•
Check to make sure that the
bus connector is properly
inserted.
•
Check for interruptions in the
bus cable to the DP master.
•
Check configuration data and
the parameters.
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