Danfoss FC 300 Profibus Manual page 46

FC 300 Profibus
The following table below shows the principle
structure of the PROFIdrive Parameter Channel.
The DP V1 Parameter Request telegram consists of
3 data blocks:
-
a Request Header, which defines the kind of
request (Read or Write), and the number of
parameters to access. The master sets the
Request Reference, and uses this information to
evaluate the response
-
an address field, where all addressing attributes
of the desired parameters are defined
-
a data field, where all parameter data values
are placed
The DP V1 Parameter response telegram consists of
2 data blocks:
-
A response header, which indicates if the
request is performed without errors (Response
ID), the number of parameters, and the
Request Reference set by the master within the
corresponding request telegram
-
A Data field, where the requested data are
placed. If one or more internal requests have
failed, an Error Code is placed instead of the
data values
As the response telegram does not include parameter addressing information, the master must identify the
structure of the response data from the request telegram.
46
How to Access FC 300 Parameters
MG.33.C2.02 - VLT is a registered Danfoss trademark
DP V1 Parameter
request
Re- Request
quest reference
Request ID
header
Axis
Ad- No. of
dress parameters
field Attribute
No. of
elements
Parameter no.
Sub index
n'th parameter
no.
Data Data format
field No. of values
Values
n'th data value ...
DP V1 Parameter
response
Response Request ref.
header mirrored
Response ID
Axis mirrored
Parameter No. of
values parameters
Format
No. of values
Values of error
values
n'th parameter
value
Byte no.
0
1
2
3
4
5
6
7
8
9
4+6*(n-1)
...
4+6*n
(4+6*n)+1
(4+6*n)+2
Byte
no.
0
1
2
3
4
5
6
...