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CANopen

What Is CANopen?

The Object Dictionary, PDO/SDO logic and typical use of the CANopen protocol built on the CAN bus.

4 min readUpdated: 2026-07-05

CANopen is a standard protocol on the robust CAN bus that defines each device's parameters in an Object Dictionary. It is common in servos, I/O and drives.

PDO
Real-time process data (fast)
SDO
Parameter read/write (configuration)
On a CAN bus, termination (120 Ω at both ends) and correct baud rate are critical; if missing, communication is unstable.

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