Acyclic Communication - Standard; Acyclic Communication - Manufacturer-Specific - Siemens SINAMICS G110M Function Manual

7.5.2

Acyclic communication - standard

This type of acyclical communication supports the ID read request and the diagnostic read
request. All other requests receive the "request not implemented" message response.
● ID request:
– Master -> slave
– Slave -> master
● Diagnostic request:
– Master -> slave
– Slave -> master no error
The following repsonse is issued for all other write or read requests:
● Read requests
● Write requests
7.5.3

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.
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.
Fieldbuses
Function Manual, 01/2016, FW V4.7 SP6, A5E34229197B AC
Slave -> master general error
USS parameter channel (Page 112).
Communication via AS-i - only for G110M
7.5 Cyclic and acyclic communication via CTT2
;
213