FC 300 CANopen
MG.33.J1.02 VER. 050301 – VLT is a registered Danfoss trademark
5
Introduction
About this Manual
First time users can obtain the most essential
information for quick installation and set-up in
these chapters:
Introduction
How to Install
How to Configure the System
Application Examples
For more detailed information including the full
range of set-up options and diagnosis tools please
refer to the chapters:
How to Control the FC 300
How to Access FC 300 Parameters
Parameters
Troubleshooting
Technical Overview
CANopen is a low-level network that standardizes communications between industrial devices (sensors, limit
switches, motor controls) and high-level devices (controllers). CANopen follows the Open Systems
Interconnection (OSI) model and is based on CAN technology for Media Access Control and Physical
Signalling.
CANopen is designed on the basis of three standards: DS102
CAN Physical Layer for Industrial Applications
,
DS 301
CANopen Communication Profile for Industrial Systems
and DSP 402
Device Profile Drives and
Motion Control.
CANopen systems can be configured to operate in a master-slave or a distributed control architecture using
peer-to-peer communication. Up to 127 nodes in a multi-drop network topology are supported, and
communication options can be powered directly from the bus, using the same cable for communication.
Nodes can be removed or inserted without powering down the network.
Each node on the network has its own unique Communication OBject IDentifier (COB-ID) to distinguish it on
the network. The access control is based on the CSMA/CA (Carrier Sense Multiple Access / Collision
Avoidance) principle, meaning that all nodes may have access to the network at the same time. If two
nodes attempt to get control of the network bus simultaneously, the CAN protocol resolves the issue by
arbitration. In this way collisions on the network are avoided.
CANopen defines device profiles for devices belonging to specific classes. For other devices, a custom class
must be defined in order to make it CANopen compatible. This further enhances the interchangeability and
interoperability of the network.