Lenze EMF2179IB - Manual (Page 5)

Preface
Introduction
1
1.1
1.1-2 EDSDEN EN 06/2004
For bigger machineswith buslengthsofmore than 100 metres, INTERBUSor
PROFIBUS-DP (PROFIBUS-Decentralised Periphery) are frequently used. The
PROFIBUS-DP is always used together with a master control (PLC) – here 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,forexampleintheautomotiveindustry.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
2 Mbits/s.
With the 9300 servo controller series, Lenze has implemented the system
busbasedon CAN (Controller Area Network). In thisconnection, functionsof
the CANopen communication profile according to DS301 were integrated.
The main task of the system busis toexchange 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 controllersare synchronisedtoeach other bymeansof
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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