Cycle Clock Scaling Of External Profibus Interface To Internal Profibus Interface - Siemens SIMOTION D4 5-2 Series Commissioning And Hardware Installation Manual

Parameter assignment / addressing
5.3 Configuring PROFIBUS DP
5.3.5 Cycle clock scaling of external PROFIBUS interface to internal PROFIBUS
interface
Definition
Cycle clock scaling means that an external PROFIBUS interface of the SIMOTION D4x5-2
(X126/X136) can be operated in an integer multiple of the internal PROFIBUS interface. This
reduces the CPU load, thereby allowing you to operate more axes, for example. The settings
of the scaled cycle clocks for the external DP interfaces are made in HW Config.
Supplementary conditions
The following supplementary conditions are applicable to cycle clock scaling:
● An external DP interface of the D4x5-2 is used as an isochronous slave interface. Only in
● For SERVO, IPO, and IPO2, settings can also be made for all permissible cycle clocks.
Note
The IPO cycle clock of the IPO in which the synchronous operation technology object
runs must be set equal to the cycle clock of the isochronous external DP slave interface.
● The second external DP interface can be operated as an isochronous master (while the
● One or both external DP interfaces can also be operated as non-isochronous, free-
126
this case can an integer cycle clock scaling of isochronous external DP slave interface to
internal interface be specified. This is checked during compilation and an error message
is output in the event of noncompliance. If the external DP interfaces are configured as
equidistant interfaces but none are configured as slaves and cycle clock scaling is
specified for these interfaces, an error is output during compilation.
Master and slave axes can run in different IPO levels. Different cycle clocks and phase
offsets are tolerated by the system.
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.
running interfaces. In this case, there is no effect on the cycle clock settings.
Commissioning and Hardware Installation Manual, 02/2012
SIMOTION D4x5-2