● The second external DP interface of a SIMOTION D410‑2 DP can be operated as an
isochronous master (while the other is an isochronous slave) in order to operate external
drives,
for example. In this case, the cycle clock must be the same as the cycle clock of the
internal PROFIBUS DP. If this condition is not satisfied, an error message is output during
compilation.
● One or both external DP interfaces can also be operated as non-isochronous, free-running
interfaces. In this case, there is no effect on the cycle clock settings.
Application example
The system consists of a synchronous master (DP master) and at least one
SIMOTION D410‑2 DP synchronous slave (DP slave). The synchronous master contains the
master axis; the synchronous slave contains the following axes:
● The axes in the SINAMICS Integrated of the D410‑2 DP synchronous slave must exhibit
high performance with a servo cycle clock of 1.5 ms and an internal DP cycle of 1.5 ms.
This requires that the internal fast PROFIBUS DP be decoupled from the slower external
PROFIBUS DP.
● The PROFIBUS DP has, for example, a cycle time of 6 ms due to the quantity framework
on the bus; in all cases, its cycle time exceeds that of the cycle clock of the internal DP
interface.
● The master values are transmitted via the DP bus. Further nodes can also be connected
to the DP bus, e.g. DP drives, distributed I/O, etc.
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Figure 6-5 Example of a cycle clock scaling for PROFIBUS DP
Parameter assignment / addressing
6.3 Configuring PROFIBUS DP
SIMOTION D410-2
120 Commissioning and Hardware Installation Manual, 01/2015
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