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Introduce the difference between Canopen bus and Canopen absolute encoder

2021-04-30 H:24:53
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Controller area network is one of the most widely used open field buses in the world. As a remote network communication control method with advanced technology, high reliability, complete functions and reasonable cost, CAN bus has been widely used in various automation control systems. For example, CAN bus has unparalleled advantages in various fields such as automotive electronics, automatic machinery, intelligent buildings, power systems, security monitoring, ships, elevator control, fire safety, and medical equipment. Especially in high-speed railways and wind power generation, Can bus is a better signal standard.


CAN bus with its low development and maintenance cost, high bus utilization, long transmission distance (up to 10Km), high transmission rate (up to 1Mbps), priority multi-master structure and reliable error detection processing mechanism, make up for the traditional RS The low utilization rate of the -485 network bus, the single master-slave structure, and the lack of hardware error detection enable users to establish stable and efficient fieldbus control systems in harsh application environments such as lifting equipment, steel metallurgical equipment, and engineering vehicles. , Because the Can bus has a reliable signal error detection and processing mechanism, it can still transmit data well in the case of strong interference and unreliable grounding. Its hardware error self-check and redundant multi-master station ensure the safety of the control equipment.


CANopen absolute encoder is an open protocol based on CAN bus, managed by CiA Association. Mainly used in the automotive industry, industrial machinery, intelligent buildings, medical equipment, marine machinery, laboratory equipment and research fields, steel metallurgy, wind power generation, port machinery and other fields. The Canopen specification allows information to be transmitted via broadcast and also supports point-to-point data transmission. Users can perform network management, data transmission and other operations through the Canopen object dictionary. Especially Canopen has the characteristics of anti-interference and multi-master station application, which can form the actual redundant backup of the master station and realize safer control.


Absolute encoders are characterized by reliability and anti-interference. The characteristics of Canopen bus and CANopen absolute encoders can be said to be a match made in heaven: Compared with other signal forms, Canopen bus is more reliable, more economical, more versatile and safer (device error ). These characteristics are compared with other outputs: the parallel output signal of the absolute value encoder-the output power component is too fragile, the number of cores is too much, it is easy to break, the cable cost is high; the SSI output signal-called the synchronous series signal, when the distance is long Or when it is interfered, the signal delay makes the clock and data signals no longer synchronize, and the data jumps; Profibus-DP bus signal-high grounding and cable requirements, high cost, the master station cannot be selected, once the bus is connected to the gateway or the master station If there is a failure, the entire system will be paralyzed. These shortcomings may sometimes be fatal when used in equipment such as lifting, steel, engineering, medical, wind power, high-speed rail, etc. Canopen bus can effectively avoid these shortcomings, so the use of Canopen signals in the above equipment can be said to be more reliable, more economical, safer.


The CANopen absolute encoder of Weihai Adike Electronic Technology Co., Ltd., due to its fast signal output speed, can be set in the function setting to output the absolute value of the encoder angle position value together with the change speed value, for example, the first two bytes output absolute value Value angle (can be rotated several times) position, the third byte outputs speed value and so on. , Which is very helpful when the frequency converter is successively used for lifting equipment. The speed value can be used as the feedback of frequency conversion speed regulation, and the position value can be used for precise positioning and synchronization control, and it can have speed and position. It can be applied to crane synchronization, parking anti-swing, safe area control, anti-collision and speed safety protection. Synchronization of gate opening, synchronization of construction vehicles, etc. , And the unique multi-master function of the CANopen absolute encoder can realize the redundancy backup of the master station of the receiving controller, and the parameters of the backup controller can be set behind the master controller. Once the main controller system fails, the backup controller can assume safety protection control, thereby realizing various safety controls of the equipment.



CANopen绝对值编码器


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