5 Functional Mechanisms of this Application
5.2 Parameter access functionality
SINAMICS G120 DP at S7-1200
Entry-ID: 70155469, V1.4, 07/2018
Siemens AG 2018 All rights reserved
5.2 Parameter access functionality
Figure 5-7: Parameter access functionality
Acyclic parameter access occurs parallel to the cyclic process data exchange. This
saves resources, since the data is only established on demand, i.e. when a
parameter is to be transferred.
In the SIMATIC controller, the “Write data set” and “Read data set” functions must
be used for this. “Data set 47” must always be used.
Writing “data record 47” sends a job to the SINAMICS converter which performs
the job and provides a response. Reading “data set 47” makes the response of the
SINAMICS converter available in the SIMATIC controller so it can be evaluated.
The instructions “WRREC” and “RDREC” are used in the SIMATIC controller for
reading and writing data sets.
5.2.1 Job and response structure
For the structure of the jobs and responses (data record 47) please refer to the
function manual “Fieldbus systems” (/6/).
Since the structure of the data set to be sent or received depends on the number
of jobs and their number format, a generally valid structure cannot be used.
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