Lenze EMF2179IB Manual do Utilizador descarregar pdf (Página 5)

Preface

Introduction

1.1



1.1-2

EDSDEN EN 06/2004

For biggermachineswith buslengths of more than 100 metres, INTERBUS or

PROFIBUS-DP (PROFIBUS-Decentralised Periphery) are frequently used. The

PROFIBUS-DP is always used together with a master control (PLC) – h ere the

PROFIBUS master transmits e. g. the setpoints to the single PROFIBUS

devices (e. g. Lenze controller).

When using the data baud rate of 1.5 Mbits/s typical for the PROFIBUS-DP,

the sensors and actuators receive the process data. Due to the data

transmission mode and the telegram overhead, a bus cycle time results at

1.5 Mbits/s, which is sufficient to control e. g. conveyors. If, for technical

reasons, the process data must be transmitted faster to the sensors and

actuators, the PROFIBUS can also be operated with a data transmission rate

of maximally 12 Mbits/s.

The INTERBUS proves its worth primarily in commercial sized installation

withmanynodes, for exampleintheautomotive industry.Theringstructure

offers excellent diagnostic functions. It can be exactly detected, which node

telegram is destroyed by electromagnetic interferences or if the INTERBUS

cable is affected by a short circuit or earth fault. Moreover, the INTERBUS

with a baud rate of 500 kbits/s is more efficient in the process data

transmission than other bus systems with the same baud rate. If data is to

be transmitted extremely fast, the INTERBUS can also be operated with

2Mbits/s.

With the 9300 servo controller series, Lenze has implemented the system

bus based on C AN (Controller AreaNetwork). In this connection, functionsof

the C ANopen communication profile according to DS301 were integrated.

The main task of thesystem bus is to e xchange data between the controllers

and to easily communicate with sensors, actuators and operating/display

units without the need of a master control. Furthermore, you can realise

applicationsin which controllers are synchronised toeach otherby meansof

the system bus.

The CAN bus is available at a reasonable price and is suitable for smaller

machines.

CANopen is a communication protocol specified to the CiA (CAN in

Automation) user group. Lenze can provide communication modules for

communicatingwithCANopenmasters.Thesemodulesarecompatiblewith

the specification DS 301 V4.01.

The American automation specialist Allan Bradley developed the DeviceNet

fieldbus based on the CAN controller. This communication profile is

published by the ODVA user organisation. A great amount of sensors and

actuators are available. Similar to CANopen, a DeviceNet master is used to

control the DeviceNet.

The Echelon company (USA) has developed the Local Operation Network for

distributed industrial applications with non-time critical demands. This bus

system is mainly used in building automation. Each device has an own

intelligence so that a master control system is only required in a restricted

way or not at all.

PROFIBUS-DP

Interbus

Lenze system bus (CAN)

CANopen

DeviceNet

LON

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