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CANopen

3.2

Under the technical management of the Steinbeis Transfer Centre for Automation, the CANopen profile was

developed on the basis of the Layer 7 specification CAL (CAN Application Layer). In comparison with CAL,

CANopen only contains the functions suitable for this application. CANopen thus represents only a partial

function of CAL optimized for the application in hand, so permitting a simplified system structure and the use

of simplified devices. CANopen is optimized for fast data exchange in real time systems.

The organization CAN in Automation (CiA) is responsible for the applicable standards of the relevant profiles.

CANopen permits:

• Simplified access to all device and communication parameters

• Synchronization of several devices

• Automatic configuration of the network

• Cyclical and event-controlled process data communication

CANopen comprises four communication objects (COB) with different characteristics:

• Process data objects for real time data (PDO)

• Service data objects for parameter and program transmission (SDO)

• Network management (NMT, Heartbeat)

• Pre-defined objects (for synchronization, emergency message)

All device and communication parameters are subdivided into an object directory. An object directory

encompasses the name of the object, data type, number of subindexes, structure of the parameters and the

address. According to CiA, this object directory is subdivided into three different parts. Communication

profile, device profile and a manufacturer-specific profile (see object directory).

CANopen communication

3.3

Communication profile

3.3.1

Communication between the network users and the Master (PC / Control) takes place by means of object

directories and objects. The objects are addressed via a 16 bit index. The CANopen communication profile

DS 301 standardizes the various communication objects. They are accordingly divided into several groups:

• Process data objects PDO for real time transmission of process data

• Service data objects SDO for read/write access to the object directory

• Objects for synchronization and error display of CAN users:

SYNC object (synchronization object) for synchronization of network users

EMCY object (emergency object) for error display of a device or its peripherals

• Network management NMT for initialization and network control

• Layer Setting Services LSS for configuration by means of serial numbers, revision numbers etc. in the

middle of an existing network

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