NORD Drivesystems BU0060 - Manual (Page 11)

1 Introduction
BU 0060 GB-4112 11
1. Introduction
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1.1 General
This CANnord/ CANopen documentation is valid for the NORD series trio SK 300E, SK 500E,
SK 700E, SK 750E. For discontinued device series (e.g. vector mc) which are no longer supplied, the
technical documentation is available on request (older version of BU0060).
The respective basic devices are delivered with a blank cover for the technology unit slot. The basic
models do not have any components for parameterisation and control.
In order to set up communication with CANnord/ CANopen, either a CANnord/ CANopen customer
unit or a Technologiebaugruppe CANnord/ CANopen technology module (according to the device
series) must be installed and connected.
The only exceptions to this from the SK 5xxE series are the types above SK 511E, in which the
CANnord/CANopen function is integrated as standard and can be used via an RJ45 plug connector.
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1.2 The bus system
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1.2.1 CAN Bus
The CANbus enables powerful automation systems to be realised with distributed intelligence. The
reason for the broad application of the CANbus protocol is mainly the availability of very reasonably
priced protocol components.
CANbus is based on linear topology. Using repeaters, branch-like topologies are possible. Solutions
based on fibre optic conductors as well as double wire lines can be used. The conflict recognition and
resolution, as well as error recognition, integrated in the CAN bus protocol, enables high bus utilisation
and data security.
Bus access rights are not issued by a higher-level control unit. Instead, each subscriber can start
transmitting a message as soon as the bus is free (multi-master capability). With simultaneous access
of several participants, the participant with the highest priority receives the access rights. The priority
is assigned according to the identifier of the messenger in CANbus.
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1.2.2 CANopen
CANopen is an open communications profile for various industrial automation systems. It is based on
the CANbus system (Controller Area Network), developed by Bosch, and describes the layers 1
(physical layer) and 2 (data transmission) of the OSI reference model (ISO 11898). CANopen was
specified by the international CAN-in-Automation (CiA) organisation and defines the communication
mechanisms (process data, parameterisation, monitoring etc.) via the CANopen bus.
CANopen can be used for data exchange between devices from different manufacturers.
Alongside the communication profile, CANopen defines device profiles for the most important types of
device used in industrial automation technology, e.g. digital and analog I/Os, drives, etc.
The CiA CANopen specification DS-301 and DS-402 is supported (does not apply for the integrated
RJ45 interface of the SK 5xxE series (SK 511E and above)).
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