Lenze i950 Series, Manual

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16.3.4 Parameter data transfer
Data communication with PROFINET is characterised by the simultaneous operation of cyclic
and acyclic services in the network. As an optional extension, the parameter data transfer
belongs to the acyclic services, which provides access to all device parameters.
Details
•
The access to the device data depends on the PROFIdrive profile.
•
Only one parameter request is processed at a time (no pipelining).
•
No spontaneous 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 directions 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 "Write.req" is used to transmit the data set (DB47) as parameter request to the IO-
Device.
2
.
"Write.res" is used to confirm the input of the message for IO-Controller.
3
.
With Read.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 .
After parameter processing, the parameter request is completed by transmitting the
parameter 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 field", the initiator specifies the access to the "DB47" data set. The
data that is written 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 written are contained in the "Data"
field.
Configuring the network
PROFINET
Parameter data transfer
360