Danfoss VLT PROFIBUS DP MCA 101 - 5.2.6 DP-V1 Features for Parameter Access

Master
SAP
Slave SAP Description
50 (32H) 49 (31H) Master Class 2: Initiate request
50 (32H) 0..48 (0..30H) Master Class 2: Abort, read, write,
data transfer
51 (33H) 50, 51 (32H,
33H)
Master Class 2: Alarm
51 (33H) 51 (33H) Master Class 2: Read, write
Table 5.2 Service Access Points (SAP)
5.2.6 DP-V1 Features for Parameter Access
This section describes how to use DP-V1 for accessing
frequency converter parameters.
The standard PROFIBUS DP-V1 read and write services are
not sucient for accessing the many parameters and
attributes in the frequency converter. For this reason, the
PROFIdrive parameter channel is dened. Using this
parameter read/write is performed by addressing a single
DP-V1 object in the frequency converter as shown in the
example, Table 5.3.
For a detailed description of the DP-V1 command handling,
refer to the PROFIBUS DP-V1 Design Guide.
Example
Slot=0
Index=47
PROFIBUS
telegram
header
Data unit PROFIBUS
telegram
trailer
DP-V1
command/response
PROFIdrive V3.0
parameter
channel
DU
0
DU
1
DU
2
DU
3
Req./Res.
Header
Data
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
specic
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 Specied
0 Function
number
0x48
Idle REQ, RES –
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 DP-V1
2 47 Index DP-V1
3 xx Data length DP-V1
4..n User data PNO drive prole
V3.0
Table 5.4 DP-V1 Command/Response Headers
5.2.8 DP-V1 Acyclic 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 and
minimum/maximum value.
•
Descriptive text for parameter values.
•
Access to multiple parameters in 1 telegram is
also possible.
Table 5.5 shows the structure of the PROFIdrive parameter
channel.
Parameter Access Programming Guide
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