Siemens SINAMICS G110D Operating Instructions Manual page 185

Data Exchange
A data exchange request first transfers parameter data to the inverter and then transfers the
reply back to the master. This request is the 'normal' method by which PKW transfers take
place in other protocols such as USS or Profibus.
Image 6-46 Parameter exchange request and response
Error Responses
As with acyclic standard requests, any vendor specific requests other than those listed
above, including requests for any data set other than 47, will result in the appropriate
'request not implemented' error response.
In the event that the inverter is unable to service an acyclic vendor specific request within the
time required by the AS-i standard, it will instead respond with error code 4, 'busy'. Since
one second is allowed between the request and response it is extremely unlikely that this
code will ever be used.
SINAMICS G110D
Operating Instructions, 07/2016, FW V3.63, A5E36768472B AB
6.11 Operation in fieldbus systems
Functions
185