Danfoss VLT PROFIBUS DP MCA 101 Programming Manual page 27

Parameter Access
For a detailed description of the DP-V1 command
handling, refer to the PROFIBUS DP-V1 Design Guide.
Example
Slot=0
Index=47
PROFIBUS Data unit
telegram
DP-V1 PROFIdrive V3.0 parameter
header
Command/ channel
response
DU DU D D Req./Res.
0 1 U U Header
2 3
Table 5.3 General Structure for Telegram
Use the DP-V1 command/response part for the standard
DP-V1 read/write on slot 0, index 47 data block.
Use the PROFIdrive V3 parameter channel to access
specific parameter data in the frequency converter.
5.2.7 DP-V1 Read/Write Services
Table 5.4 shows the content of the DP-V1 command/
Response headers and their possible attributes.
DU byte Value Meaning
0 Function Idle REQ, RES
number
0x48
0x51 Data transport REQ,
RES
0x56 Resource manager
REQ
0x57 Initiate REQ, RES
0x58 Abort REQ
0x5C Alarm REQ, RES
0x5E Read REQ, RES
0x5F Write REQ, RES
0xD1 Data transport
negative response
0xD7 Initiate negative
response
0xDC Alarm negative
response
0xDE Read negative
response
0xDF Write negative
response
1 Always zero Slot number
2 47 Index
3 xx Data length
4..n User data
Table 5.4 DP-V1 Command/Response Headers
5.2.8 DP-V1 Acyclical Parameter Channel
Use the PROFIdrive parameter channel for read and write
access to parameter values and attributes.
•
Parameter values of simple variable, array and
visible string.
•
Parameter description elements such as type,
minimum/maximum value, and so on.
MG37G102
Programming Guide
Table 5.5 shows the structure of the PROFIdrive parameter
channel.
PROFIBUS- PROFIBUS DP-V1 telegram for read/write from or to a
telegram
frequency converter parameter:
trailer
Data
PROFIBUS
telegram
header
Table 5.5 Structure of the PROFIdrive Parameter Channel
Table 5.6 shows the principle structure of the PROFIdrive
parameter channel.
The DP-V1 parameter request telegram consists of 3 data
blocks:
Specified
DP-V1
Request
header
Address field
DPV1
Data field
DPV1
DPV1
PNO drive profile V3.0
Table 5.6 Principle Structure of the PROFIdrive Parameter Channel
The DP-V1 parameter response telegram consists of 2 data
blocks:
Danfoss A/S © Rev. 05/2014 All rights reserved.
•
Descriptive text for parameter values.
•
Access to multiple parameters in one telegram is
also possible.
Data unit
DP-V1 PROFIdrive V3.0
command/response parameter channel
DU DU DU DU Req./
0 1 2 3 Res.
Header
•
A request header, which defines the 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.
Parameter request
Request reference
Request ID
Axis
No. of parameters
Attribute
No. of elements
Parameter no.
Sub index
n'th parameter no.
Data format
No. of values
Values
n'th data value
•
A response header, which indicates if the request
is performed without errors (response ID), the
number of parameters, and the request reference
PROFIBUS
telegram
5
trailer
Data
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
...
25
5