Appendices; Structure Of User Data/Process Data - Siemens SIDOOR ATD4 W Series System Manual

Appendices

A.1

Structure of user data/process data

The structure of the user data block in the telegram is independent of the PROFINET/PROFIBUS
specification used for data transfer. The structure (contents and structure) of the user/process
data largely corresponds to the specifications for the cyclic data exchange of the PROFIBUS
"variable-speed drives" profile. This ensures that users can use the same mechanisms to access
the process data (= control/status words and setpoints/actual values) and parameters of a device
irrespective of whether this is done via PROFIBUS DP or PROFINET IO.
Telegram data structure
The user data for cyclic data transfer are subdivided into two areas that can be transferred in
every telegram:
• Parameter area (PKW)
The PKW area handles the parameter transfer between two communication partners (for
example SIMATIC and SIDOOR).
This involves, for example, reading and writing parameter values and reading parameter
descriptions.
The PKW interface generally contains tasks for operation and display, maintenance and
diagnostics.
• Process data area (PZD)
The PZD area consists of signals that are required for automation:
– Control words and setpoints from the master to the slave
– Status words and actual values from the slave to the master
The contents of the parameter area and the process data area are defined by the slave drives.
You will find additional information about this in the drive documentation.
Figure A-1 User data structure
ATD4xxW for industrial applications
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