FC 300 Profibus
How to Access FC 300 Parameters
Master SAP
Slave SAP
Meaning
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
How to Use the DP V1 Features for Parameter Access
This section describes how DP V1 can be used for accessing VLT parameters.
For units as complex as frequency converters, the standard PROFIBUS DP V1 read and write services are not
sufficient for accessing the many parameters and attributes in the drive. For this reason, the PROFIdrive
Parameter Channel is defined. Using this parameter Read/Write is performed by addressing a single DP V1
object in the FC 300, in the following way:
Slot = 0
Index = 47
The telegram has the following general structure:
Data Unit
PROFIBUS
Telegram
Header
DP V1
Command/response
PROFIdrive V3.0 Parameter Channel
PROFIBUS
Telegram
Trailer
DU
0
DU
1
DU
2
DU
3
Req. / Res. Header
Data
The DP V1 command/response part is used for the standard DP V1 read/Write on the Slot 0, Index 47
data block.
The PROFIdrive V3 Parameter Channel is used to access specific parameter data in the VLT.
For a detailed description of the DP V1 command handling, please refer to the PROFIBUS DP V1 Design
Guide, ref. MG.90.EX.YY.
DP V1 Read / Write Services
The table below shows the content of the DP V1 command / Response headers and their possible attributes.
DU Byte
Value
Meaning
Specified
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
0
0xDF
Write negative response
1
Always zero
Slot number
DPV1
2
47
Index
DPV1
3
xx
Data length
DPV1
4..n
User data
PNO Drive Profile V3.0
44
MG.33.C2.02 - VLT is a registered Danfoss trademark