CiA® 457: CANopen interface profile for wireless transmission

When linking a CANopen network to a wireless transmission medium (WTM), a gateway device is needed. The purpose of such a gateway device is, for example, to connect a remote controller to a crane’s embedded CAN network or to bridge two CAN segments via a "link over the air". A compilation of use cases is summarized in the CiA 812 technical report, which is available for free download on the CiA’s website. To allow a simple setup of the control architectures required for such use cases, CANopen gateways are needed. These gateways mediate between the "CANopen environment" and the communication techniques used on the wireless transmission medium. CiA 457 specifies such types of devices. CANopen devices following the CiA 457 support either CAN or any wireless transmission medium as the physical layer and the data link layer. On the higher layers, CiA 457 devices use CANopen. Thus, CiA 457 devices enable the implementation of a virtual CANopen network based on different lower layers. These lower layers cover not only CAN but also wireless communication techniques.

Block diagram of a CiA 457 compliant router device; often only two ports are implemented – one CANopen interface and one WTM interface

According to CiA 457, a WTM-based CANopen device supports the CANopen device architecture with the object dictionary. Regarding CANopen CC, the basic communication services, such as the SDO (service data object) server channel, emergency producer, and heartbeat producer, are supported. Optionally, SDO client functionality, PDOs (process data objects), emergency consumer, or heartbeat consumer functionality can also be supported. CiA 457 devices utilizing CANopen FD have not been specified yet. Devices mediating between a CAN-based and a WTM-based environment need to support both types of interfaces: CAN-based and WTM-based. Such CANopen router devices can essentially utilize the functions that have already been specified in the CiA 302-7. For configuration purposes, additional management functions for the lower layers (LLM) are provided in the CiA 457.

To connect CAN segments "over the air", CiA 457 devices use communication techniques specified in CiA 315 - CANopen generic frame for wireless tunneling and for transfer of diagnostic data.

 

Title Details
Published
Size
Status
Action
CiA 302-7 version 1.0.0 CANopen additional application layer functions - Part 7: Multi-level networking
Scope

This specification describes the interface for bi-directional CANopen-to-CANopen communication in multi-level networks. It supports multiple CANopen networks implementing hierarchical and non-hierarchical architectures.

 2009-02-02 907 KB DSP Login
CiA 315 version 1.0.0 CANopen generic frame for wireless tunneling and for transfer of diagnostic data
Scope

This specification specifies the generic frame for the transparent transmission of CAN messages on a wireless network.

 2011-08-09 626 KB DSP Login
CiA 457 version 1.1.0 CANopen interface profile wireless transmission
Scope

This document specifies the CANopen interface profile for devices providing a gateway function to wireless transmission media ports.

2022-08-09 725 KB DS Login
CiA 812 version 1.0.0 CiA 457 device use cases
Scope

This application note describes use cases CANopen devices support communication capabilities as specified in CiA 315 “CANopen Generic frame for wireless tunnelling of CAN messages and for transfer of diagnostic data”.

 2011-08-09 425 KB TR Login