Baumer BA_DSRT_22DJ - Handbuch (Seite 10)

Manual_CANopen_StrainLink_EN_V3_05.doc 10/65 Baumer
22.07.11/dam Frauenfeld, Switzerland
4 CANopen
4.1 Introduction
The CANopen protocol is an open, standardized ISO/OSI Layer 7 protocol based on the Controller Area
Network (CAN) application layer. CANopen has been developed, internationally standardized and is
maintained by the CAN in Automation (CiA) user organization.
CANopen has the following performance characteristics:
•
Transmission of time-critical process data using the producer-consumer principle. Messages may be
received by all bus users. They are not given the destination address but rather they have an
identifier.
•
Standardized device description (data, parameters, functions, programs) in the "Object directory."
Access to all objects of a device using the standardized transmission protocol according to the client-
server principle.
•
Standardized node monitoring (node guarding and heartbeat), fault signaling (emergency messages)
and network coordination (network management).
•
Standardized system for synchronous operation (synchronization message).
•
Standardized function for configuration of the baud rate and the device ID over the bus using LSS.
CANopen consists of a communication profile (controlling communications) and various device profiles for
the typical application profiles.
The CANopen communication profile (CiA DS-301) controls the "How" of communications. In this respect,
differentiation is made between real-time data and parameter data.
Baumer Process Instrumentation sensors use the DS404 device profile for measurement and control
equipment.