Structure Of Requests And Responses - Siemens SINAMICS S120 Series Function Manual

Characteristics of the parameter channel
● One 16-bit address exists for each parameter number and subindex.
● Concurrent access by several additional PROFIBUS masters (master class 2) or
PROFINET IO supervisor (e.g. commissioning tool).
● Transfer of different parameters in one access (multiple parameter request).
● Transfer of complete arrays or part of an array possible.
● Only one parameter request is processed at a time for each controller/device connection
(no pipelining).
● A parameter request/response must fit into a data set (e.g. PROFIBUS: Max. 240 bytes).
● The request or the response header is user data.
3.4.2

Structure of requests and responses

Structure of parameter request and parameter response
Parameter request
Values for Request header
write access
only
1st parameter address
...
nth parameter address
1st parameter value(s)
...
nth parameter value(s)
Communication
Function Manual, 12/2018, 6SL3097-5BD00-0BP0
Request reference
Axis
Attribute
Parameter number
Subindex
Attribute
Parameter number
Subindex
Format
Values
...
Format
Values
...
Communication according to PROFIdrive
3.4 Acyclic communication
Request ID
Number of parameters
Number of elements
Number of elements
Number of values
Number of values
Offset
0
2
4
6
8
53