7.5 Communications via AS-i
Acyclic communication - manufacturer-specific
The manufacturer-specific acyclical communication is performed via data record 47 in PIV
format. The PIV format structure is identical with that for the USS parameter channel, see
AS-i System Interface Manual
To reduce the transfer volume, there is not only the "normal" "data exchange" PIV
mechanism, but also the "Read data" and "Write data" commands.
● Data exchange:
– Control -> inverter request
– Inverter -> control response
● Read data:
The inverter sends a read command, and the data of the last exchange request or write
request is transferred from the inverter to the control.
● Write data
Write OK: -> 53 hex
Because the PIV transfer protocol specifies the transfer direction independently, all
parameters can be transferred as data exchange request/response. Requests for reading
and writing data are included primarily to reduce the transferred data volume for the
repeated reading or writing of parameters.
SINAMICS G110M Operating Instructions
Operating Instructions, 04/2015, FW V4.7.3, A5E31298649B AD