profibus.pdf

Profibus DP V1

About this Document .............................................. 2

Profibus DPV1 introduction .................................... 3

Principle of data exchange by Profibus DPV1 ...... 4

Addressing scheme for DP V1. ............................... 5

Accessing VLT parameters on DP V1. ................... 5

Description of DP V1 Read / Write Telegram. ....... 7

Function of Profidrive parameter channel. ......... 10

DP V1 on PLC based master.

(Master class 1) ....................................................... 16

DP V1 on Configuration / commissioning tools.

(Master class 2) ....................................................... 16

Examples Profidrive Parameter access Services. . 30

Example of DP V1 Read Parameter Service. ....... 35

Data types. .............................................................. 37

Size Attributes. ....................................................... 38

MG.90.E1.02 - VLT is a registered Danfoss trademark

Profibus DP V1

About this Document

This document describes the features supported of

the Profibus DP V1 functions in all Danfoss Drives

with a Profibus option.The functionality is described

at a level, which will be sufficient for most system

configuration and managing activities.

It is assumed, that the following Specifications /

limitations are fully respected:

Profidrive Profile V 2 specifications.

Profidrive Profile V3 specifications concerning

the DP V1 Profidrive parameter channel.

Limitations in DP V1 features supported

Beside the drive behavior, a brief description of

master applications of master class 1 and master

class 2 can be found.

What you should already know

The Danfoss Profibus is designed to communicate

with any master abiding by the Profibus DP

standard.

For full system overview, please refer to the following

documents:

Operating Manual for FCM300 (ordering no.

MG03BXYY), FCD300 (ordering no.MG04BXYY),

VLT2800 (ordering no. MG28AXYY)

It is therefore assumed, that you have full

knowledge of the PC or PLC you intend to use as a

master in your system. Any questions pertaining

non-Danfoss hardware or software products is

beyond the scope of this manual, and is no concern

to Danfoss.

Profibus Manual for FCM300, FCD300,

VLT2800 (ordering no. MG90AXYY)

where X is referring to the version number code and

YY the language code.

For non-Danfoss equipment, please refer to the

appropriate specifications.

If you have questions about how to set up Master –

Master connection or communication to non-

Danfoss slaves, the appropriate manuals should be

consulted.

For further detailed description of this matter, the

following documents might be useful:

Technical Guide “PROFIBUS – DP Extensions to

EN 50170 (DPV1)” V2.0, April 1998, Order no.

2.082

Software versions

The following table shows from which software ver-

sions Profibus DPV1 is supported. The software ver-

sion can be read-out in parameter 624 Software

versions.

Draft PROFIBUS Profile PROFIdrive Profile Drive

Technology V3.0 September 2000, Order no.

3.172

Unit

Software version

FCD 300

Ver. 1.30 / 2.00

Even if you are an experienced Profibus system

builder, we suggest you to read this Guide in its

entirety before you start programming, since

important information can be found in all chapters.

VLT 2800

Ver. 2.62 / 2.00

VLT 5000

Ver. 3.61 / 4.00

Assumptions

This guide assumes, that you are using a Danfoss

frequency converter with Profibus DP V1

functionality. It is also assumed, that you as a

master are using a PLC and/or PC equipped with a

Communication card supporting all the Profibus

communication services required by your

application.

MG.90.E1.02 - VLT is a registered Danfoss trademark

Profibus DP specifications.

Profibus DP V1

Profibus DPV1 introduction

The Profibus DP extension DPV1 offers additional to

the cyclical data communication of DP V0, an a-

cyclical communication. This feature is possible by a

DP master class1 (e.g. PLC) , as well as a DP

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

Cyclical communication means that data transfer

takes place all the time with a certain update rate.

This is the known DP V0 function normally used for

quick update of I/O Process Data.

A-cyclical communication means a one time event,

mainly used for Read / Write on parameters from

Process controllers, PC based tools or monitoring

systems.

Features of a Master class 1 system:

Features of a Master class 2 system:

Initiate / Abort a-cyclical connection.

A-cyclical read/write on parameters.

The a-cyclical connection is fixed , and can not be

changed during operation.

The a-cyclical connection can dynamically be

established (Initiate) or removed (Abort) even though

a master class 1 is active on the network.

In general a master class 1 is used as Process

controller, responsible for commands, speed

reference, status of the application etc ( PLC or PC

based controller.)

The MC 2 a-cyclical connection is typically used for

configuration or commissioning tools for easy access

to each parameter in any slave in the system.

The MC 1 a-cyclical connection might be used for

general parameter access in the slaves.

The frequency converter supports a subset of the V1 specifications shown in the table below.

Type of

Master

Read

Write

Data

Initiate

Abort

Alarm

Danfoss

type

transport

Frequency

(read data) (read data)

(read and

(open a

(close a

converter

from slave) to slave)

write data) connection) connection)

FCD 300, VLT2800 MC 1

FCM 300

MC 2

VLT5000, VLT6000 MC 1

VLT8000 AQUA

MC 2

MG.90.E1.02 - VLT is a registered Danfoss trademark

Cyclical data exchange (DP V0).

Profibus DP V1

Principle of data exchange by Profibus DPV1

In a DP cycle the MC 1 will first update the cyclical

process data for all slaves in the system. After that

the MC 1 has the possibility of sending one a-

cyclical message to one slave. If a MC 2 is

connected, the MC 1 will handle over the Token to

MC 2 who now is aloud to send one a-cyclical

message to one slave. After that, the token is

handled back to the MC 1, and a new DP cycle is

started

MC : Master Class

C1...Cn: Cyclical data

AC1: Acyclical data Master Class 1

AC2: Acyclical data Master Class 2

A DP V1 Read/Write service takes place via a

Profibus SD2 telegram, which is a telegram of

variable length as shown on the figure below.

LEr

DSAP SSAP DU

FC ED

68H

x...

16H

Start Delimiter

Length

Ler

Length repeat

Destination Address

Source Address

Function Code

DSAP

Destination Service Access Point

SSAP

Source Service Access Point

Data Unit for DP services

FCS

Frame Checking Sequence

End Delimiter

MG.90.E1.02 - VLT is a registered Danfoss trademark

Profibus DP V1

Profibus DP services is activated via specific Service

Access Point’s (SAP). For a-cyclical communication,

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 1: Alarm

51 (33H)

Master Class 1: Read, Write

Addressing scheme for DP V1

The structure of a DP V1 slave is shown

in the figure.

A DP V1 slave consists of a number of

physical or virtual slots. Slot 0 is always

present, and represents the basic unit.

Each slot can contain until 255 data blocks

addressed by an index and of until 255 byte

length.

The master must address a variable in the

DP V1 slave as follows:

/Slave address/Module #/Index #

Accessing VLT parameters on DP V1

This section describes how DP V1 can be used for

accessing VLT parameters.

A Danfoss DP V1 slave only contains Slot 0.

Because of the complex parameter structure of

drives, a specific procedure for accessing

parameters for drives is defined. This is named the

“Profidrive Parameter Channel”, and is part of the

Profidrive Profile V3 specifications.

According to this, parameter access must be made

trough one single DP V1 object with the following

address:

Slot = 0.

Index = 47.

MG.90.E1.02 - VLT is a registered Danfoss trademark

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