4 Commissioning
4.12 Acyclic data
86
DX-NET-PROFINET2-2
01/22 MN040062EN
www.eaton.com
4.12.4.1 Acyclic parameter channel for DX-NET-…
The acyclic parameter channel is used in order to configure the parameters
of the variable frequency drive/variable speed starter; it corresponds to the
PROFIdrive profile.
Parameter channel
The parameter channel is embedded as a payload data block in the acyclic
PROFINET write/read PDUs.
Acyclic data objects of a server are addressed in PROFINET via slot and
index. The parameter channel is always addressed with index 47.
Protocol
The main task of the DX-NET-PROFINET2-2 communication interface is to
map the protocol in such a way that the parameter channel can be operated
completely transparently by PROFINET communication.
Regardless of whether data should be read or written, the first request from
the client will always be a write request.
A parameter request will define whether the job is a read job or a write job.
After the write request is transmitted (contains read or write job), a write res-
ponse without data will be expected. Then, prompted by the application of
the higher level PLC, the client polls the variable frequency drive with read
requests. This keeps acknowledging the read request as negative (Error:
State Conflict) until the read response has been completed and a reply (read
order: with data / write request: without data) can be sent.
The following figure shows an example of the protocol between a PROFINET
client, the DX-NET-PROFINET2-2 communication interface and a variable fre-
quency drive/variable speed starter.
Figure 36:
Acyclic parameter channel protocol
Client
Error
OK or
Error
OK or
Error
OK or
Error
Error
Error
Parameter
Request
Parameter
Request
Error or
no Data
Error or
no Data
Parameter
Response
Parameter
Response
(pos./neg.)
Parameter
Processing
PowerXL
Write Request
Write Response
(no Data or Error)
Read Request
Read Response
(no Data or Error)
Read Request
Read Response
((no) Data or Error)
PROFINET
DX-NET-PROFINET2-2
