CAN dictionary

Explains vocabulary and abbreviations used in CAN technology

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galvanic isolation

Galvanic isolation in CAN networks is performed by optocouplers or trans­formers placed between CAN controller and CAN transceiver chip.


Device with at least two network inter­faces transforming all seven OSI (open system interconnection) protocol layers, e.g. CANopen-to-Ethernet gateway or CANopen-to-DeviceNet gateway.


See global fail-safe command.

global error

A global bus error affects all connected CAN devices.

global fail-safe command (GFC)

The global fail-safe command (GFC) is a high-priority CAN message defined in the CANopen safety protocol (see EN 50325-5). It may be used to switch the safety-related logical devices (SRLDs) into the safe state, which improves the overall system reaction time in case of an error. It shall be followed by the related SRDO.

Source CANdictionary (2016) - CiA CAN in Automation -