In 1990, some famous manufacturers of numerical control systems and servo systems in Germany, such as SIEMENS, INDRAMAT, BOSCH, AMK, and some important scientific research institutions co-sponsored the establishment of the SERCOS Association with the aim of establishing a unified CNC in Germany. Control, computer digital control) The interface standard between the unit and the digital servo device, thereby ensuring that the relevant devices developed in accordance with this standard have good interchangeability. In 1992, the standard was proposed as German and international standard DIN/IEC 44. In 1995, this standard was approved as the international standard IEC 61491. Since then, the SERCOS protocol has been widely accepted by manufacturers of CNC systems and servo systems in many countries in Europe and the United States and Japan, and has begun to develop and produce products that comply with the agreement. The application of this protocol has become an important development direction of servo technology since the end of the 1990s. Its application has also expanded from the initial CNC machine tools to all types of CNC machinery.
The emergence of digital servo devices is an important milestone in the development of digital control technology. Using digital servo devices, all command values ​​and actual values ​​can be processed in a microcontroller, not only can achieve traditional torque loop and speed loop control, but also can complete fine interpolation in a very short time to achieve position Ring control. Compared with the use of analog servo devices, the use of digital servo devices can obtain higher processing accuracy and processing speed, and the control hardware is simple, and the complexity and cost of the system are greatly reduced.
With the development of digital servo devices, how to realize the data communication between the control unit and the digital servo device has become a key issue, that is, a suitable digital interface must be provided for the control unit and the digital servo device. Practice has proved that the use of SERCOS interface to connect the control unit and digital servo device to achieve serial real-time data communication, has the following advantages: simplify the wiring between the control unit and the servo device; simplify the control hardware, make debugging more convenient; can transfer parameters, instructions Data such as state and data; no drift of data transmission, can realize long-distance control.
As a serial real-time data communication interface dedicated between the control unit and the digital servo device, SERCOS is selected for its superior performance by many world-leading numerical control system manufacturers and machine tool manufacturers. More importantly, the International Electrotechnical Commission approved its international standard IEC 61491 in 1995. The English name is: Electrical equipment to industrial machines-Serial data link for real-time communication between controls and drives. It laid a solid foundation for its worldwide promotion and application.
The National Industrial Machinery Electrical System Standardization Technical Committee has formulated the national standard corresponding to the SERCOS international standard IEC 61491: "GB/T 18473-2001 Real-time serial communication data link between electrical equipment control and drive equipment of industrial machinery", by the national quality The General Administration of Supervision, Inspection and Quarantine was issued on October 24, 2001 and began on April 1, 2002. Prior to this, SERCOS bus has been put into practice. Nowadays, more than 70 companies worldwide can provide digital products with SERCOS interface, and various types of printing machines, food packaging machines, assembly robots, semiconductor processing equipment, and textile machines produced abroad. There are also SERCOS bus applications in other special-purpose machines. Currently, SERCOS is the only motion bus standard that is supported by more than 120 controllers and driver manufacturers worldwide.
The physical layer of the SERCOS interface is composed of fiber optic cable, digital communication method (no signal drift problem, instruction and feedback data accuracy up to 32-bit), communication speed is 4 Mbit/sec, and it will soon reach 6 Mbit/sec. Due to the use of optical media, it will not be disturbed by any electrical system. The fiber optic connection replaces hundreds of wires in the multi-axis control system, thereby effectively increasing the project speed and reducing the time for project commissioning and maintenance. Low-cost plastic optical fiber supports point-to-point distances up to 130 ft with a maximum ring-to-point distance of 32,800 ft. (See SERCOS Topology Diagram).
The SERCOS-based system can be used in high-performance applications and can connect up to 32 servo drives and a motion controller. (The SERCOS specification supports 254 drives and I/O sites). The SERCOS communication protocol supports the transmission of drive parameters by the motion controller, which enables the servo drive to automatically establish connections, precise control and intelligent diagnostic functions. Because the characteristics of the SERCOS protocol determine its relatively low demand for network communication bandwidth, it can ensure that the communication cycle of all the motion controllers and servo drivers connected on the SERCOS network is less than 1 millisecond. Users using SERCOS will find that SERCOS makes their machines faster and more accurate than traditional analog technologies.
As one of the advocates of SERCOS, TRIO has been committed to the research and development of SERCOS products. In the motion controller series of TRIO, the SERCOS control daughter board was introduced, which can be plugged into a series of products such as the MC206 and MC224, enabling the user to directly connect with any servo driver supporting the SERCOS interface as required. The technical barriers formed by some large companies and the control functions of TRIO high-performance motion controllers can complete most of the current complex applications. At the same time, the user can also use the SERCOS communication control mode, and then use the traditional way to control the servo movement, so as to achieve the organic integration of the two.
At present, China's high-end SERCOS market is monopolized by two European and American companies. For more Chinese companies to benefit from this advanced SERCOS bus technology, TRIO Corporation matches Hitachi, Yaskawa, and Omron servo drives in terms of low-power, high-power and German Kobe servos. Drive matching, constitutes a cost-effective motion control system. The system control parameter settings are simple and clear. The programming method uses a very friendly and intuitive Chinese user interface.
The global SERCOS Association attaches great importance to the application of SERCOS in conjunction with TRIO motion controllers in various fields. Mr. Peter Lutz, Chairman of the SERCOS Global Association during the IAC 2006 exhibition, personally visited the TRIO booth to give guidance.
[center] above from left to right are: Mr. Peter Lutz, Chairman of SERCOS Global Association, Dr. Zhao Tienan, Chief Representative of TRIO China.
TRIO Global Sales Director Mr. Roy Bamforth[/center]
During the IAC 2006, TRIO Corporation combined Japan's Hitachi Servo, Yasukawa Servo, and Germany's Kobe Servo through its MC206, which was awarded the "Industrial Design Award" in the United States, and the SERCOS module developed for Yaskawa. As shown in the table below:
[center] (TRIO General Manager Mr. Chris Backhouse is discussing the project with the client)[/center]
SERCOS has laid a broad road for the digital servo network. It can be foreseen that in the near future, servo systems with SERCOS interfaces will enter various fields related to servo applications. In 1999, Rexroth Indramat occupied the first place in the North American servo drive market with a 10.5% share. On the one hand, the company's application engineering, sales, service, and user support were strengthened. Another major factor was the promise of openness. Structure - SERCOS. At present, China is in the stage of industrial upgrading. In order to improve the core competitiveness of electromechanical products in the international market, it is an inevitable choice to adopt advanced technologies. TRIO is willing to serve customers with high-quality products and technologies to help Chinese users World-class stage shows its style.
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