CANopen

CAN based higher layer protocol

CANopen was originally developed as a standardized embedded network with high flexible configuration capabilities. It was pre-developed in an Esprit project under the chairmanship of Bosch. In 1995, the CANopen specification was handed over to CAN in Automation (CiA) international users and manufacturer's group. Originally, the CANopen communication profile was based on the CAN Application Layer (CAL) protocol. CiA members have reviewed the specification and have enhanced the functionality. Since version 4.01, the CiA DS 301 Application Layer and Communication Profile, known as CANopen specification, also includes the application layer specification. This version of CANopen has been accepted by the European standardization authorities as EN 50325-4.

The family of specifications also includes different device profiles as well as frameworks for specific applications. CANopen networks are also used in off-road vehicles, maritime electronics, medical equipment, and railways. The very flexible application layer and many optional features are well suited for designing tailored networks. This is what embedded network designers need: as much freedom as possible in order to develop better products than the competitors. On the other hand, it is still a standardized application layer implemented in off-the-shelf hardware. In addition, several generic configuration tools are available. Nevertheless, the user can define application-specific device profiles.

Advantages:

• Open and vendor independent , and standardized in EN50325-4
• Supports interoperability of different devices.
• High speed real-time capability.
• Modular - covers simple to complex devices.
• User-friendly - wide variety of support tools available.

Features:

• Auto configuration of the network
• Easy access to all device parameters.
• Device synchronisation.
• Cyclic and event-driven data transfer.
• Synchronous reading or setting of inputs, outputs or parameters.

For more information about CANopen please visit the CIA website. Accutest can supply the master or slave source code for CANopen as well as a range of tools and resources to assist in the development and testing of CANopen networks. Please email Accutest sales with your query.