CP 443-5 Extended
Manual, 11/2018, C79000-G8976-C162-09
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Notes on operation
4
4.1
General operation on PROFIBUS
Disruptions with modified transmission speed
If you modify the transmission speed when downloading the configuration, the CP 443-5
Extended sporadically remains in the "stopping" mode.
In such cases, a memory reset of the S7 station is necessary.
Follow the steps outlined below:
1.
Run a memory reset on the S7 station (CPU)
To reset memory, use the corresponding function in the configuration tool.
2.
Turn the power supply to the S7 station on and off again.
Bus fault of the type "bus short-circuit"
If there is a bus short-circuit, this can cause one of the following responses on the
PROFIBUS subnet:
●
Failure of the bus line
●
Failure of stations / of all stations
The response can be recognized by evaluating with OB86.
Note
Bus fault statistics
With STEP 7 special diagnostics, you can read out the information from the entry
PROFIBUS > Statistics > Bus fault statistics If there is a bus fault, it is possible that different
bus fault events are registered in the statistics even though it appears that identical bus
faults have occurred.
