CANopen是一种架构在控制器局域网路（Controller Area Network, CAN）上的高层通信协定，包括通信子协定及设备子协定常在嵌入式系统中使用，也是工业控制常用到的一种现场总线。

CANopen实作了OSI模型中的网络层以上（包括网络层）的协定。CANopen标准包括寻址方案、数个小的通信子协定及由设备子协定所定义的应用层。CANopen支持网络管理、设备监控及节点间的通信，其中包括一个简易的传输层，可处理数据的分段发送及其组合。一般而言数据链结层及实体层会用CAN来实作。除了CANopen外，也有其他的通信协定（如POWERLINK及EtherCAT）实作CANopen的设备子协定。

CANopen is a communication protocol and device profile specification for embedded systems used in automation. In terms of the OSI model, CANopen implements the layers above and including the network layer. The CANopen standard consists of an addressing scheme, several small communication protocols and an application layer defined by a device profile. The communication protocols have support for network management, device monitoring and communication between nodes, including a simple transport layer for message segmentation/desegmentation. The lower level protocol implementing the data link and physical layers is usually Controller Area Network (CAN), although devices using some other means of communication (such as Ethernet Powerlink, EtherCAT) can also implement the CANopen device profile.