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0198441113586, V2.01, 11.2008
IL•1F CANopen DS301 1 Introduction
Fieldbus interface 9
1 Introduction
1.1 About this manual
This manual describes the fieldbus specifics for products in a fieldbus
network addressed via CANopen DS301.
1.2 CAN-Bus
The CAN bus (Controller Area Network) was originally developed for
fast, economical data transmission in the automotive industry. Today, the
CAN bus is also used in industrial automation technology and has been
further developed for communication at fieldbus level.
Features of the CAN bus The CAN bus is a standardized, open bus enabling communication be-
tween devices, sensors and actuators from different manufacturers. The
features of the CAN bus comprise
• Multimaster capability
Each device in the fieldbus can transmit and receive data independ-
ently without depending on an "ordering" master functionality.
• Message-oriented communication
Devices can be integrated into a running network without reconfigu-
ration of the entire system. The address of a new device does not
need to be specified on the network.
• Prioritization of messages
Messages with higher priority are sent first for time-critical applica-
tions.
• Residual error probability
Various security features in the network reduce the probability of
undetected incorrect data transmission to less than 10
-11
.
Transmission technology In the CAN bus, multiple devices are connected via a bus cable. Each
network device can transmit and receive messages. Data between net-
work devices are transmitted serially.
Network devices Examples of CAN bus devices are
• Automation devices, e.g. PLCs
•PCs
• Input/output modules
•Drives
• Analysis devices
• Sensors and actuators