外文翻譯---使用labviewfpga模塊開發(fā)可編程自動(dòng)化控制器-資料下載頁(yè)
2024-10-04 19:14本頁(yè)面
【正文】 se FPGA VI Reference function stops the FPGA VI and closes the reference to the device. Now you can download other piled FPGA VIs to the device to change or modify its functionality.The LabVIEW host VI can also be used to perform floatingpoint calculations, data logging, networking, and any calculations that do not fit within the FPGA fabric. For added determinism and reliability, you can run your host application on an RTOS with the LabVIEW RealTime Module. LabVIEW RealTime systems provide deterministic processing engines for functions performed synchronously or asynchronously to the FPGA. For example, floatingpoint arithmetic, including FFTs, PID calculations, and custom control algorithms, are often performed in the LabVIEW RealTime environment. Relevant data can be stored on a LabVIEW RealTime system or transferred to a Windows host puter for offline analysis, data logging, or user interface displays. Each NI PAC platform that offers RIO hardware can run LabVIEW RealTime VIs.Within each R Series and CompactRIO device, there is flash memory available to store a piled LabVIEW FPGA VI and run the application immediately upon power up of the device. In this configuration, as long as the FPGA has power, it runs the FPGA VI, even if the host puter crashes or is powered down. This is ideal for programming safety power down and power up sequences when unexpected events occur.5 Using NI SoftMotion to Create Custom Motion Controllers The NI SoftMotion Development Module for LabVIEW provides VIs and functions to help you build custom motion controllers as part of NI PAC hardware platforms that can include NI RIO devices, DAQ devices, and Compact FieldPoint. NI SoftMotion provides all of the functions that typically reside on a motion controller DSP. With it, you can handle path planning, trajectory generation, and position and velocity loop control in the NI LabVIEW environment and then deploy the code on LabVIEW RealTime or LabVIEW FPGAbased target hardware.NI SoftMotion includes functions for trajectory generator and spline engine and examples with plete source code for supervisory control, position, and velocity control loop using the PID algorithm. Supervisory control and the trajectory generator run on a LabVIEW RealTime target and run at millisecond loop rates. The spline engine and the control loop can run either on a LabVIEW RealTime target at millisecond loop rates or on a LabVIEW FPGA target at microsecond loop rates.6 Applications Because the LabVIEW FPGA Module can configure lowlevel hardware design of FPGAs and use the FPGAs within in a modular system, it is ideal for industrial control applications requiring custom hardware. These custom applications can include a custom mix of analog, digital, and counter/timer I/O, analog control up to 125 kHz, digital control up to 20 MHz, and interfacing to custom digital protocols for the following: control control control data acquisition condition monitoring control prototyping (RCP) control and acquisition data acquisition and control, vibration, and harshness (NVH) analysis7 Conclusion The LabVIEW FPGA Module brings the flexibility, performance, and customization of FPGAs to PAC platforms. Using NIRIO devices and LabVIEW graphical programming, you can build flexible and custom hardware using the COTS hardware often required in industrial control applications. Because you are using LabVIEW, a programming language already used in many industrial control applications, to define your NI RIO hardware, there is no need to learn VHDL or other lowlevel hardware design tools to create custom hardware. Using the LabVIEW FPGA Module and NI RIO hardware as part of your NI PAC adds significant flexibility and functionality for applications requiring ultrahighspeed control, interfaces to custom digital protocols, or a custom I/O mix of analog, digital, and counters.
試題試卷相關(guān)推薦
鄂ICP備17016276號(hào)-1