Operating instructions

MC : Master Class

C1...Cn: Cyclical data

AC1: Acyclical data Master Class 1

AC2: Acyclical data Master Class 2

PROFIBUS DP services are activated via specific Service Access Points (SAP). For acyclical com-

munication, the following SAP are specified:

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

5.2.6. 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 per-

formed by addressing a single DP V1 object in the frequency converter, in the following way:

Slot = 0

Index = 47

The telegram has the following general structure:

PROFIBUS

Header

Data Unit

PROFIBUS

Trailer

DP V1

Command/response

PROFIdrive V3.0 Parameter Channel

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.

5. How to Access the Parameters VLT

Profibus

MG.33.C4.02 - VLT

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