Acyclic Communication With The Drive - Siemens SIMOTION D410-2DP/PN Installation Manual

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7.4.7

Acyclic communication with the drive

Overview
PROFIdrive drive units are supplied with control signals and setpoints by the controller and
return status signals and actual values. These signals are normally transferred cyclically (i.e.
continuously) between the controller and the drive.
For SINAMICS S110/S120, configure the axis message frames for data exchange (refer to
Performing an offline configuration (Page 145)).
In addition to cyclic data exchange, PROFIdrive drive units feature an acyclic communication
channel. In particular, this is used for reading and writing drive parameters (e.g. error codes,
warnings, controller parameters, motor data, etc.).
As a result, data can be transferred on an acyclic as opposed to a cyclic basis when required.
Acyclic reading and writing of parameters for PROFIdrive drives is based on the DP V1 services
"read data set" and "write data set".
The acyclic DP V1 services are transferred while cyclic communication is taking place via
PROFIBUS or PROFINET. The PROFIdrive profile specifies precisely how these basic
mechanisms are used for read/write access to parameters of a PROFIdrive-compliant drive.
The PROFIdrive standard states that "pipelining" of jobs on PROFIdrive drives is not supported.
● Only one "write/read data record" can be performed at any one time on a drive unit (e.g.
SINAMICS S120 control unit or the SINAMICS Integrated of a SIMOTION D).
● However, if several PROFIdrive drive units are connected to a controller, a job can be
processed for each of these drive units at the same time. In this case, the maximum total
number of jobs will depend on the control system. (for SIMOTION, this is a maximum of 8
jobs at a time).
In the case of acyclic data exchange with SINAMICS drives, this means you will have to
coordinate the write/read jobs with one another (buffer management). An interlock must be
set in order to prevent the application or different parts of the application from sending
overlapping jobs to the same PROFIdrive drive unit.
Additional references
Additional information on how to use DP V1 services can be found in the
Communication System Manual.
SIMOTION Utilities & Applications also has a DP V1 library with functions that are capable of
undertaking coordination tasks commonly associated with acyclic communication. The library
not only coordinates access to the system functions (_ReadRecord/_WriteRecord/
_readDriveParameter/_writeDriveParameter/ etc.), but also expands the range of functions for
frequently required tasks, e.g. the reading of faults and alarms from the drive unit.
SIMOTION Utilities & Applications is provided as part of the SIMOTION SCOUT scope of
delivery.
SIMOTION D410-2
Commissioning and Hardware Installation Manual, 01/2015
7.4 Additional information on configuring the SINAMICS Integrated
Commissioning (software)
SIMOTION
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