Table 10-7 Busf Led Flashes - Siemens Simatic S7-300 CPU 31xC Series Installation And Operating Instructions Manual

Table 10-7 BUSF LED flashes
Possible errors
The CPU is DP master:
Failure of a connected station
•
At least one of the configured
•
slaves cannot be accessed.
Faulty configuration
•
The CPU is active DP slave
Possible causes:
The response monitoring time has
•
expired.
PROFIBUS DP communication is
•
down.
Wrong PROFIBUS address.
•
Faulty configuration
•
Reference
Details on the OBs and on SFCs required for their evaluation can be found in the
Online Help
Functions
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
CPU reaction
Call of OB 86 (when CPU is in RUN
mode). CPU switches to STOP if OB
86 is not loaded.
Call of OB 86 (when CPU is in RUN
mode).
CPU switches to STOP if OB 86 is not
loaded.
System Software for S7-300/400 - System and Standard
and in the Manual
.
Debugging functions, diagnostics and troubleshooting
10.6 Diagnostics using status and error LEDs
To correct or avoid error
Verify that the bus cable is connected
to the CPU, or that the bus is not
interrupted.
Wait until the CPU has completed its
startup. If the LED does not stop
flashing, check the DP slaves or
evaluate the diagnostic data for the DP
slaves.
Check the CPU.
•
Verify that the bus connector is
•
properly seated.
Check for breaks in the bus cable to
•
the DP master.
Check the configuration data and
•
parameters.
STEP 7
10-15