The core of open CNC system - open controller

The core of open CNC is an open motion controller. PMAC (Programmable multiple-axis controller) is an open-programmable multi-axis motion controller developed by Delta Tau Corporation of USA following the open system architecture standard. In the field of motion control after more than 20 years of exploration, Delta Tau successfully used Motorola's DSP56001 for PMAC, plus a dedicated user gate array chip, combined with the flexibility of the PC, making the PMAC system control is very mature and reliable. At present, Delta Tau not only has Advantage® series PMAC-NC machine controller, controls 4- to 8-axis motion, but also has TURBO PMAC, PMAC2 (second-generation PMAC), MACRO (optical cable control loop), UMAC (3U structure), etc. The latest technology controller. Up to 128 axes of motion control can be achieved. 1 The PMAC controller's fully open PMAC was introduced in the early 1990s. It provides machine tool functions, robot features, timing detection, and general-purpose automation capabilities. It can handle motion control, logic control, resource management, and host interaction. . There are 160,000 PMACs in the world. The biggest advantage of PMAC is standing in the user's position, convenient, fast, stable, reliable, and fully open, so that when users use PMAC to set up their own system, they are like an architect designing houses and bridges, showing their talents, and everything It's so easy. The open PMAC of the hardware structure adapts to various hardware operating platforms, can run on IBM and its compatible machines, runs and develops on Win95, 98, 2000, WinNT and Linux, and has PC, STD, VME, PCI, 104 bus and serial ports. The offline function allows users to select the appropriate host. At the same time, the underlying control program is only for PMAC, so the same control software can run on different hardware platforms. PMAC is applicable to all motors, including ordinary AC motors, DC motors, AC and DC servo motors, stepping motors, linear motors, ceramic motors, etc. It is also suitable for hydraulic motors with a control accuracy of 5nm. For different motors, PMAC can provide corresponding PWM, PFM, DAC, Pulse+Dir and other control signals. PMAC can receive feedback from various detection components, including tachogenerators, resolvers, laser interferometers, parallel data, photoelectric encoders, magnetostrictive displacement sensors, and grating scales. Most of PMAC's addresses are open to users, including all information on the motor, all information on the coordinate system, and various protection information. Therefore, the design and selection of the system is flexible and free from limitations. Various advanced design concepts can be incorporated into the system, and different motors can be used in the same system to receive different feedback information. The openness of the software structure supports various high-level language PMAC controllers to provide 16-bit, 32-bit DLL, and ActiveX control PTALK, users can use C++, VB, VC, Delphi to develop their own under NT, Win95, Win98, Win2000 Human-machine interface. The true open PMAC controller in the machine language not only has open machine features in hardware, but also supports the user to call ready-made interpolation modes such as straight lines, arcs, splines, and PVT cubic curves, and supports the standard RS274 code. You can customize G code, M code, T code, D code, and S code to implement functions that cannot be accomplished by the conventional machine language. All PLC functions open PMAC built-in PLC function, generally I / O can be extended to 1024 in and 1024 out, can write 64 asynchronous PLC program, the operation of the I / O is almost pure software work, through similar to the assembly The language pointer variable allows the user to control bits and bytes. Can be connected with other related software interfaces. Although the PMAC controller is inserted in the expansion slot of the PC, the control of the axis and the control of the I/O are completed by the controller itself, so the PC can share the current mature drawing of Auto CAD. Software to facilitate process programming. 2 The unique performance of the PMAC controller emulation operation By modifying the address of the PMAC controller, the simulation running of the program can be realized, and the traditional data system needs to develop the simulation software on the host computer. Interrupt Function The PMAC controller has a PLC that can request interrupts from the host for more tight real-time control. Position capture function PMAC position capture is completed by the hardware circuit, only takes 20 seconds and capture precision is very high. This property is widely used in the measurement industry. Position Follow-up Function The position of the PMAC controller is very easy to follow. The entire process is related to only two variables. At the same time, one-to-many follow-up can be performed and the follow-up ratio can be modified in real time. High-resolution control signals The general PMAC controller has a 16-bit DAC output and the PMAC2 controller provides the capabilities of an 18-bit DAC. Data Acquisition and Analysis Function PMAC can use its own development tools to complete the collection and graphical analysis of many information about the motor and the coordinate system. It also provides 24 acquisition sources for users to use. Multiple development functions For the same piece of PMAC, the user can develop multiple times to gradually improve the process, and the programs developed on the same card are compatible, which can shorten the next development cycle. 3 Development of a true open CNC system At present, PMAC control is being promoted and applied on a large scale in China. It is mainly used for CNC machine tools, various types of robots, coordinate measurement, on-line detection and processing, positioning and tracking of satellites, and bending machines. Electric injection molding machines and various machine tool transformations have achieved quite good results. These will be gradually introduced in the relevant columns in the future. In addition, PMAC controllers can easily establish coordinate systems and establish closed-loop and double-closed-loop and three-closed-loop control systems. We believe that our products will be your choice for success. I believe your choice will usher in your brilliant career.

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