The CiA 302 document series specifies additional CANopen services and functionalities that extend the CANopen application layer and communication profile specified in CiA 301. The functions are optional and address specific requirements of CANopen networks and programmable CANopen devices. They provide harmonized mechanisms for network startup and management, device configuration and program download, dynamic SDO connections, network variables and process images, network redundancy, communication between multiple CANopen networks, project management, and energy saving.

The CiA 302 document series was developed for CANopen CC, based on CAN CC. For CANopen FD, the corresponding additional application layer functions are currently being specified in the CiA 1302 document series. CiA 302 serves as a basis and reference for the development of the CiA 1302 document series.

CiA 302-1 provides general definitions for the additional CANopen application layer functions specified in the subsequent parts of the series. It introduces the concepts and terminology used for network management, configuration and program download, network variables and process images, dynamic SDO management, network redundancy, multi-level networking, and other extensions.

CiA 302-2 specifies additional mechanisms for managing CANopen networks, including defined network startup behavior. It also addresses networks without an NMT managers and networks with one or multiple devices capable of taking over the NMT manager role, including “flying-master” concepts for increased network availability.

CiA 302-3 defines objects and file formats for configuring programmable CANopen devices and for downloading and controlling application programs. It provides standardized mechanisms for managing device configuration and program data over the CANopen network.

CiA 302-4 specifies mechanisms for handling network variables and managing the process image of programmable CANopen devices. It addresses the assignment of CANopen object dictionary entries to program variables and supports dynamic index assignment for variables whose mapping is determined during programming or configuration. The specification incorporates the content on network variables and process image management previously defined in CiA 405, which has been withdrawn.

CiA 302-5 specifies mechanisms for dynamically establishing SDO connections between CANopen devices. This is particularly useful in networks that may be modified during operation, for example by an end user who is not necessarily a CANopen expert, or in applications where a gateway needs to access arbitrary data points in the network at run-time. An SDO manager handles requests for communication connections from SDO requesting devices and dynamically establishes the required SDO connections without the need to pre-configure communication paths between individual device pairs. CiA 302-5 specifies how communication requests are submitted to the SDO manager and how the requested SDO connections are established.

CiA 302-6 specifies mechanisms for implementing redundant CANopen networks. It addresses applications requiring high communication availability, such as marine and rolling stock applications, where a CANopen device may be connected to two redundant CAN networks. The specification defines how the device operates on the two networks, including which communication objects are transmitted on which network and at what time, and how the received communication is evaluated. These mechanisms support safety-critical and mission-critical communication by providing network redundancy in addition to the communication functions defined by CiA 301.

CiA 302-7 specifies mechanisms for bidirectional CANopen-to-CANopen communication between multiple CANopen networks. It supports both hierarchical and non-hierarchical network architectures and allows CANopen networks to be interconnected across network boundaries.

CiA 302-8 specifies project management parameters for programmable CANopen devices. These parameters support the standardized management and handling of project-related information by CANopen and IEC 61131-compatible tools. They describe the configuration of programmable CANopen devices within a CANopen project and can be used for configuration and testing as well as for system diagnostics, spare part management, and system upgrades. The specification incorporates content on project management parameters previously defined in CiA 405, which has been withdrawn.

CiA 302-9 specifies energy-saving modes and the associated CANopen communication parameters for devices supporting energy-saving functions. It defines how devices provide information about their energy-saving capabilities, configuration, and status, including the transition to and operation in a requested energy-saving mode. The specification can be used in conjunction with CiA 320, which describes the relationship between low-power states, such as sleep mode, and normal operation and can therefore support the implementation of energy-saving functions in CANopen devices.