Acyclic Communication With The Drive - Siemens SIMOTION D410 Series Commissioning Manual

Commissioning (software)
4.4 Additional information on configuring the SINAMICS Integrated
4.4.5

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 S120, configure the axis message frames for data exchange (see
Configuring the system in offline mode (Page 59)).
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 "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. This means:
● Only one "write/read data set" operation can be performed at any one time on a drive unit
● However, if several PROFIdrive drive units are connected to a controller, a job can be
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.
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(e.g. SINAMICS S120 Control Unit or SINAMICS Integrated of a SIMOTION D).
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).
D410
Commissioning Manual, 05/2009