Siemens SINAMICS G110D Operating Instructions Manual page 182

Functions
6.11 Operation in fieldbus systems
Standard Acyclic Data Transfer
Mandatory standard acyclic transfers are supported. These are ID read request and
Diagnostic read request. Since the inverter will always send and receive two words of cyclic
binary data, the last byte of the request is 0xBB.
Image 6-41
Image 6-42
All other standard acyclic transfer requests will result in a 'request not implemented' error
response.
Image 6-43
Vendor Specific Acyclic Data Transfer
Datasets
The standard method for inverter parameter transfer is dataset 47 which allows a flexible
bidirectional transfer of data to and from a large number of parameters. This is the method
used in AS-i inverters, no other datasets are recognized.
Since the PKW transfer method itself specifies the direction in which data is transferred, it is
possible to perform all parameter transfers using the data exchange request/response. Data
read and write requests are included primarily to reduce the amount of data needed to be
exchanged when repeatedly reading the same parameter or when carrying out parameter
writes.
Data Read
A data read request results in the transfer of the last parameter data accessed (either by a
write or a transfer request), i.e. the behaviour is as if a PKW read command had been issued
for the parameter last accessed. If no previous write or transfer request has been made the
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Standard ID read request and response
Standard diagnostic request and response
Unrecognised standard acyclic request and response
Operating Instructions, 07/2016, FW V3.63, A5E36768472B AB
SINAMICS G110D