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5.1.2. Read / Write in Double Word Format, DP V1

Using the special Request IDs 0X51 (read) and 0X52 (write), it is possible to read and write to all

parameters containing numeric values in a general format of Double Word. The value element

must be right aligned and unused MSBs filled with zeros.

Example: Read of a parameter of type U8 will be transmitted as 00 00 00 xx, where xx is the value

to be transmitted. The data type signalled by the telegram will be 43h (dword).

Please refer to the table

Request/ Response Attributes

later in this chapter.

Access the parameters as follows:

5.1.3. PROFIBUS DP V1

Using the acyclic DP V1 transmission it is possible to read and write parameter values, as well as

to read a number of descriptive attributes for each parameter. Access to parameters via DP V1 is

described in the

DP V1 Parameter Access section

5.1.4. PROFIBUS DP V0 / PCV Channel

Parameter access via the PCV channel is performed using PROFIBUS DP V0 cyclic data exchange,

where the PCV channel is part of the PPOs described in the

PPO Types

section. Using the PCV

channel, it is possible to read and write parameter values, as well as read a number of descriptive

attributes for each parameter. The functionality of the PCV channel is described in the

PCV Pa-

rameter Access

section.

NB!

Object and data types supported by FC 100, 200 and 300 and common to both DP

V1 and PCV parameter access are listed in the

Parameters

chapter.

5.2. DP V1 Parameter Access

This section is useful for the developer with some experience in:

PLC programs with PROFIBUS master class 1 functionality

PC applications with PROFIBUS master class 2 functionality

For more detailed instructions in use of the DP V1 function in FC 100, 200 and 300, please refer

to the Operating Instructions MG.90.EX.YY

Information about the features supported by the PRO-

FIBUS DP V1 functions

5.2.1. PROFIBUS DP V1 Introduction

The PROFIBUS DP extension DPV1 offers acyclical communication in addition to the cyclical data

communication of DP V0. This feature is possible using a DP master class 1 (e.g. PLC), as well as

a DP master class 2 (e.g. PC Tool).

Cyclical communication means that data transfer takes place continuously with a certain refresh

rate. This is the known DP V0 function normally used for quick update of I/O Process Data.

5. How to Access the Parameters VLT

Profibus

MG.33.C4.02 - VLT

is a registered Danfoss trademark