The Dbs "Read/Write_Drive_Parameters" And "Answer_From_Drive - Siemens SINAMICS G120 Manual

5 Functional Mechanisms of this Application
5.4 Parameter access functionality
5.4.2

The DBs "read/write_drive_parameters" and "answer_from_drive"

To access the parameters, a given job structure must be kept. The response of
SINAMICS G also contains a given response structure.
Job and response structure
The structure of the jobs and responses are available in
"Configuring the fieldbus, PROFIdrive profile for PROFIBUS and PROFINET,
acyclic communication" in the operating instruction (
Note Since the structure of the data record to be sent or received depends on the
number of jobs and their number format, a generally valid structure cannot be
used.
FB 20 "Parameter_Access" is therefore limited to sending and receiving the data
record. The DBs for the data record to be send and received must be set by the
user.
The job to access a parameter consists of at least 10 words. Therefore, the job
should be assembled in a DB. The response by the SINAMICS G also consists of
several words.
A job may contain the access to several parameters. Since the length of the data to
be transferred per job depends on the number and data types of the SINAMICS G
parameters, no generally valid structure can be devised.
In this example, only the ramp up and ramp down times (P1120 and P1121) and a
part of the fault memory (P945.x) is accessed. The job of writing the parameters is
stored in DB 100 "write_drive_parameters" and the job to read the parameters in
DB 101 "read_drive_parameters".
The response of the SINAMICS G is copied to DB 102 "answer_from_drive_write"
or DB 103 "answer_from_drive_write_read". The structure contained therein
corresponds to the structure for a successful writing/reading of the parameters.
Figure 5-20 DB 100 for writing the ramp up and ramp down time (in the picture: 10s and 15 s)
SINAMICS G120C at S7-300/400F-DP
Beitrags-ID: 60441457, V2.2, 11/2014
chapter 7.3.2.1
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