Lenze i950

16.3.4 Parameter data transfer
Data
communicaon with PROFINET is characterised by the simultaneous operaon of cyclic
and acyclic services in the network. As an oponal extension, the parameter data transfer
belongs to the acyclic services, which provides access to all device parameters.
Details
•
The access t
o the device data depends on the PROFIdrive prole.
•
Only one parameter request is processed at a me (no pipelining).
•
No spon
taneous messages are transferred.
•
There are only acyclic parameter requests.
Basically, a IO-Controller can always be used to request parameters from IO-Device if the IO-
Device is in the DATA_EXCHANGE state.
Transmission direcons for acyclic data transfer
Write.res
Write.req
with data (parameter request)
with data (parameter response)
without data
without data
without data
without data
Read.req
Read.res (-)
Read.req
Read.res (+)Parameter response
Parameter request Parameter request
Parameter
processing
Parameter response
IO controller
IO device
1.
A "W
rite.req" is used to transmit the data set (DB47) as parameter request to the IO-
Device.
2.
"Write.res" is used to conrm the input of the message for IO-Controller.
3.
With R
ead.req, the IO-Controller requests the response of the IO-Device
4.
The IO-Device responds with a "Read.res (-)" if processing has not been completed yet.
5.
Aer parameter processing, the parameter request is completed by transming the
par
ameter response to the IO-Controller by "Read.res (+)".
Frame structure
Destr ScrAddr VLAN Type
0x0800
RPC NDR Read/Write Block Data FCS
6 bytes 6 bytes 4 bytes 4 bytes 80 bytes 64 bytes 64 bytes 0 .... 240 bytes 4 bytes
In the "Read / Write Block eld", the iniator species the access to the "DB47" data set. The
da
ta that is wrien on this index or read by it, contain a header and the parameter request or
the parameter response. The read data or the data to be wrien are contained in the "Data"
eld.
Conguring the network
PR
OFINET
Parameter data transfer
360