Siemens Simatic ET 200pro FC Operating Instructions Manual page 118

Commissioning and optimization (software)
7.4 Commissioning of communication between the S7 CPU and the frequency converter
The parameter response table provides information about the structure of the reply data set.
Reading PROFIdrive parameters (example)
In order to make use of DS47, a data block first needs to be created in SIMATIC Manager.
The structure of the data set will then be implemented in it. In this example, a data set is
stored in DB48 for the purpose of reading P0947 (error buffer).
Image 7-8
This data set is then sent to the FC in the context of cyclic program execution (e.g., OB1)
using SFC58.
In order to be able to read the reply data set from the FC, an additional data block needs to
be created. For this purpose, DB1 is added to the project. To ensure as flexible a response
as possible, DB1 is created as a data field with a length of 240 bytes and no defined
structure. The response must then be evaluated on a request-specific basis.
Image 7-9
Once the data blocks have been created, a parameter request is written via data set DS47
using S7 function SFC58. Then, a reply data set is read with SFC59 and stored in DB1. In
this example, the start of this process is triggered by a positive edge at input In0.0.
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DB48 (DS47 read job)
DB1 (DS47 response)
Operating Instructions, 07/2016, A5E01100763B AC
ET 200pro FC