Siemens SINAMICS G150 - Structure of Requests and Responses

Operation
6.7 Communication according to PROFIdrive
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A
325
Characteristics of the parameter channel
● One 16-bit address exists for each parameter number and subindex.
● Simultaneous access by several additional PROFIBUS masters (master class 2) or
PROFINET IO Supervisor (e.g., commissioning tool).
● Transfer of different parameters in one access operation (multiple parameter request).
● Transfer of complete arrays or part of an array possible.
● Only one parameter request is processed at a time (no pipelining).
● A parameter request/parameter response must fit into a data set (e.g. PROFIBUS: max.
240 bytes).
● The request or the response header is user data.
6.7.4.1
Structure of requests and responses
Structure of parameter request and parameter response
Table 6- 18 Structure of the parameter request
Parameter request
Offset
Values for
write access
only
Request header
Request reference
Request ID
0
Axis
Number of parameters
2
1st parameter address
Attribute
Number of elements
4
Parameter number 6
Subindex
8
...
nth parameter address
Attribute
Number of elements
Parameter number
Subindex
1st parameter value(s)
Format
Number of values
Values
...
...
nth parameter value(s)
Format
Number of values
Values
...