NORD Drivesystems BU0260 - Manual (Page 9)

1 General information
BU 0260 GB Subject to technical amendments 9
1 General information
Various technology options are available for Getriebebau Nord frequency inverters. General information
regarding these can be found in the relevant main manual of the frequency inverter series (e.g. Manual
BU0200 for the SK 200E frequency inverter series). Further information concerning special technology
options (e.g. the field bus module) is included in the relevant supplementary operating instructions.
This CANopen documentation contains supplementary descriptions concerning the CANopen options for the
SK 200E frequency inverter series.
The description of other optional modules (e.g. PROFIBUS DP) is dealt with in other supplementary
documentation.
In order to set up communication with CANopen, either an internal Customer Unit or an external
CANopen Technology Unit (according to the particular application) must be installed and connected.
The CAN bus system
The CAN bus (Controller Area Network), developed by Bosch enables the implementation of powerful
automation systems with distributed intelligence. The widespread use of the CAN bus protocol is mainly due
to the availability of very economical protocol modules.
CAN Bus is based on a linear topology. Branch-like topologies are possible by using repeaters. In addition
to the use of twin conductor cables, there are also solutions based on optic fibres. The collision 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 by
several participants, access is granted to the subscriber with the highest priority. The priority is assigned
according to the identifier of the messenger in the CAN bus.
CANopen
CANopen is an open communications profile for various industrial automation systems. It is based on the
CAN bus system and describes the layers 1 (physical layer) and 2 (data transfer) 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.
As well as 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.
Getriebebau Nord GmbH supports the CiA CANopen specification DS-301 and DS-402.