The Busf Led Lights Up - Siemens CPU 313C Hardware And Installation Manual

Table 11-6

The BUSF LED lights up.

3RVVLEOH (UURUV
•
Bus fault (hardware fault).
• DP interface error.
•
Different transmission rates in
multiple DP master mode.
•
If the DP slave interface is
active or there is a bus short-
circuit on the master.
•
For a passive DP slave
interface: baud rate search,
i.e. there are currently no
other active nodes on the bus
(e.g. a master)
Table 11-7 The BUSF LED flashes
3RVVLEOH (UURUV
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
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5HVSRQVH RI WKH &38
Calls OB86 (when CPU is in RUN
mode). CPU switches to STOP if
OB86 is not loaded.
UHVSRQVH RI WKH &38
Calls OB86 (when CPU is in RUN
mode). CPU switches to STOP if
OB86 is not loaded.
Calls OB86 (when CPU is in RUN
mode).
CPU switches to STOP if OB86 is
not loaded.
5HPHGLHV
•
Check the bus cable for short
or interruption.
•
Evaluate the diagnostic data.
Reconfigure, or correct the
configuration.
5HPHGLHV
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.
11-11