FC 300 Profibus
How to Access FC 300 Parameters
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
DP V1
Parameter
request
Byte no.
Request
reference
0
Request ID
1
Re-
quest
header
Axis
2
No.
of
parameters
3
Attribute
4
No.
of
elements
5
6
Parameter no.
7
8
Sub index
9
n’th parameter
no.
4+6*(n-1)
Ad-
dress
field
...
Data format
4+6*n
No. of values
(4+6*n)+1
Values
(4+6*n)+2
Data
field
n’th data value
...
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
DP V1
Parameter
response
Byte
no.
Request ref.
mirrored
0
Response ID
1
Response
header
Axis mirrored
2
No.
of
parameters
3
Format
4
No. of values
5
Values of error
values
6
Parameter
values
n’th parameter
value
...
As the response telegram does not include parameter addressing information, the master must identify the
structure of the response data from the request telegram.
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