Siemens SINAMICS S120 Series - Page 56

Communication according to PROFIdrive
3.4 Acyclic communication
Communication
54 Function Manual, 12/2018, 6SL3097-5BD00-0BP0
Parameter response
Offset
Values for
read access
only
Error values
for negative
response only
Response header
Request reference mirrored
Response ID
0
Axis mirrored Number of parameters 2
1st parameter value(s)
Format
Number of values
4
Values or error values
6
...
...
nth parameter value(s)
Format
Number of values
Values or error values
...
Description of fields in the parameter request and response
Field
Data type
Values
Remark
Request reference
Unsigned8
0x01 ... 0xFF
Unique identification of the request/response pair for the controller. The controller changes
the request reference with each new request. The device mirrors the request reference in
its response.
Request ID Unsigned8 0x01
0x02
Read request
Write request
Specifies the type of request.
In the case of a write request, the changes are made in a volatile memory (RAM). A save
operation is needed in order to transfer the modified data to the non-volatile memory
(p0971, p0977).
Response ID Unsigned8 0x01
0x02
0x81
0x82
Read request (+)
Write request (+)
Read request (-)
Write request (-)
Mirrors the request identifier and specifies whether request execution was positive or nega-
tive.
Negative means:
Cannot execute part or all of request.
The error values are transferred instead of the values for each subresponse.
Drive object
number
Unsigned8
0x01 ... 0xFE
Number
Specification of the drive object number for a drive unit with more than one drive object.
Different drive objects with separate parameter number ranges can be accessed over the
same DPV1 connection.
Number of parameters Unsigned8 0x01 ... 0x27 No. 1 ... 39
Limited by DPV1 telegram length
Defines the number of adjoining areas for the parameter address and/or parameter value
for multi-parameter requests.
The number of parameters = 1 for single requests.
Attribute Unsigned8 0x10
0x20
0x30
Value
Description
Text (not implemented)
Type of parameter element accessed.