Descriptions of functions
10.3 Communication according to PROFIdrive
SINAMICS DCM DC Converter
444
Operating Instructions, 12/2018, A5E34763375A
Description of fields in DPV1 parameter request and response
Table 10- 30 Fields
Field
Data type
Values
Remark
Request reference
Unsigned8
0x01 ... 0xFF
Unique identification of the request/response pair for the master. The master changes the
request reference with each new request. The slave 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
negative.
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
0x00 ... 0xFF
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.
Number of elements
Unsigned8
0x00
0x01 ... 0x75
Special function
No. 1 ... 117
Limited by DPV1 telegram length
Number of array elements accessed.
Parameter number
Unsigned16
0x0001 ... 0xFFFF
No. 1 ... 65535
Addresses the parameter to be accessed.
Subindex
Unsigned16
0x0000 ... 0xFFFF
No. 0 ... 65535
Addresses the first array element of the parameter to be accessed.