1、CANopen in the ISO Layer Structure From the perspective of the OSI 7-layer network model, the CAN (Controller Area Network) fieldbus only defines the 1st layer (Physical Layer, see ISO11898-2 standard) and the 2nd layer (Data Link Layer, see ISO11898-1 standard); in actual design, these two layers are entirely implemented by hardware, and designers do … Read more
SDO (Service Data Object) is a type of message in the CANopen protocol used for reading and writing data over a CAN network. SDO is used to transmit data that is not time-sensitive, such as configuration information that only needs to be set once during initialization. There are several types of SDO transmissions: SDO Download … Read more
PDO stands for Process Data Object, primarily used for transmitting real-time data. PDO is divided into Receive PDO and Send PDO, where the reference objects for “Receive” and “Send” are the slave devices. The Receive PDO refers to the data received by the slave from the master, such as control words and target positions; the … Read more
1、CANopen‘s Predefined MessageID Classification: At the inception of CANopen, even in the automotive electronics industry where CAN bus is most widely used, the number of CAN nodes in the network and the amount of information needing communication were relatively low. People adopted CAN to replace RS485, primarily valuing its real-time advantage of burst transmission, while … Read more
CANopen protocol is a high-level protocol based on CAN serial bus system and application layer CAL, and it is also a standardized protocol for various industries. CANopen protocol provides necessary implementation methods for distributed control and embedded system applications, mainly providing: (1) interoperability and interchangeability between different CAN devices. (2) Standardized and unified system communication … Read more
1、Process Data ObjectPDO（Process Data Object) As mentioned earlier PDO belongs to process data used to transmit real-time data, that is, one-way transmission without the need for a response from the receiving nodeCAN message to confirm, from a communication terminology perspective, it belongs to the “producer-consumer” model PDO, as shown in the figure, it is like … Read more
1、Process Data Object (PDO) and Service Data Object (SDO) MessageID. When using CANopen, the configuration information and application data that need to be transmitted are placed in the Process Data Object PDO (Process Data Object) and Service Data Object SDO (Service Data Object). These objects are like baskets of fruit sold in the market; they … Read more
Author’s Note To make it easier for everyone to find technical articles related to the CANopen bus, we have specially compiled a collection of selected technical articles on CANopen published on the ‘Industrial Communication’ public account. We welcome everyone to check them out, and if you have any questions or suggestions, please feel free to … Read more
Follow our public account to not miss any updates! This tutorial is originally published by the author strongerHuang in October 2018. Tags: CAN, CANOpen, CanFestival Copyright: Commercial use is prohibited Disclaimer:This document is for personal learning purposes only. Please contact the author through the public account for authorization if you wish to reprint. 1Introduction The … Read more
Follow our public account for updates! Don’t miss any news! This tutorial was originally published by the author strongerHuang in October 2018. Tags: CAN, CANOpen, CanFestival Copyright: Commercial use prohibited Disclaimer:This document is for personal study only. Please contact the author for authorization if you wish to reprint. 1Introduction The previous article provided an overview … Read more