Operation
7.5 Communication via PROFIBUS DP
SINAMICS DCP
Operating Instructions, 09/2019, A5E34382853K
243
7.5.4.4 Diagnosing the PROFIBUS slave-to-slave communication in STARTER
Since the PROFIBUS direct data exchange is implemented on the basis of a broadcast
telegram, only the subscriber can detect connection or data faults, e.g. via the publisher data
length (see "Configuration telegram").
The publisher can only detect and report an interruption of the cyclic connection to the DP
master (A01920, F01910). The broadcast telegram to the subscriber will not provide any
feedback. A fault of a subscriber must be fed back via direct data exchange. In case of a
"master drive" 1:n, however, the limited quantity framework (see "Links and requests")
should be observed. It is not possible to have n subscribers report their status via slave-to-
slave communication directly to the "master drive" (publisher).
Diagnostics can be performed using the diagnostic parameters r2075 ("Receive PROFIBUS
diagnostics telegram offset PZD") and r2076 ("Send PROFIBUS diagnostics telegram offset
PZD"). The parameter r2074 ("PROFIBUS diagnostics, receive bus address PZD") displays
the DP address of the setpoint source of the respective PZD.
r2074 and r2075 enable the source of a direct data exchange relationship to be verified in
the subscriber.
Note
The subscribers do not monitor the existence of an isochronous publisher sign of life.
Faults and alarms with PROFIBUS direct data exchange
Alarm A01945 signals that the connection to at least one publisher of the drive device is
missing or has failed. Any interruption to the publisher is also reported by fault F01946 at the
affected drive object. A failure of the publisher only impacts the respective drive objects.
More detailed information on the messages can be found in the SINAMICS DCP List
Manual.
7.5.5 Messages via diagnostics channels
Messages can be displayed not only via the well-known commissioning tools (STARTER,
SCOUT). After the activation of a diagnostic function, the messages are also transferred to
the higher-level controller via the standardized diagnostic channels. The messages are
evaluated there or forwarded for convenient display to the corresponding user interfaces
(SIMATIC HMI, TIA Portal, etc.). The messages are shown on the respective user interfaces
similarly as in STARTER.
In this way, problems or faults can be located immediately regardless of the tool currently
being used, and then corrected immediately. No further tools must therefore be called for the
correction.
Note
Also note the general information on the diagnost
ics channels in Section "Diagnostic
(Page 211)".
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