LabVIEW FPGA模块在可编程自动化控制器开发中的应用

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"这篇文档是关于使用LabVIEW FPGA模块开发可编程自动化控制器的外文文献及翻译，主要探讨了在工业控制市场中，PAC（可编程自动化控制器）的应用日益广泛，特别是在需要高度集成的模拟和数字I/O、浮点处理以及无缝连接多个处理节点的应用中。文献详细介绍了如何利用National Instruments的LabVIEW FPGA模块和可重配置I/O (RIO)硬件，来构建定制的工业应用I/O接口，并且无需深入学习低级硬件描述语言(HDL)或板级硬件设计细节，就能实现FPGA技术在工业PAC系统中的灵活和定制化应用。" 文章首先介绍了PAC（可编程自动化控制器）的基本概念，指出它们在工业控制领域的优势，特别是在需要复杂混合信号处理和高效联网的场合。PACs能够提供比传统PLC（可编程逻辑控制器）更高的性能和集成度。接着，文献详细阐述了National Instruments的LabVIEW FPGA模块，这是一个强大的软件开发环境，允许用户通过图形化编程方式创建自定义I/O接口。LabVIEW以其直观的编程界面和丰富的功能库，简化了FPGA应用的开发流程。配合RIO硬件，用户可以跨越一系列硬件平台定义嵌入在FPGA芯片中的逻辑，而无需深入掌握底层硬件设计。文档的翻译部分进一步解释了如何使用LabVIEW FPGA模块进行实际操作，包括定义FPGA逻辑、配置RIO硬件以及快速建立硬件功能。这对于工程师和开发者来说，极大地降低了开发门槛，提高了工作效率。此外，可能还涉及到LabVIEW的其他附加软件，如用于特定工业应用的库和工具，这些工具可以帮助用户更轻松地实现系统集成，包括模拟和数字信号处理、运动控制、通信协议支持等。这份文献提供了关于使用LabVIEW FPGA模块开发PAC系统的全面指导，不仅涵盖了技术理论，还包括实践应用和案例分析，对于想要在工业自动化领域利用FPGA技术的工程师和学生来说，是一份宝贵的参考资料。

for loop is showed below in figure

21.Next to port definitions comes port directions. Directions are specified as input, output or i

nout (bidirectional), and can be referred to in table 1. Next to the specification of port directio

ns comes declaration of internal signals. Internal signals in Verilog are declared as “wire”

or “reg” data types. Signals of the “wire”

type are used for continuos assignments, also called combinatorial statements. Signals of the

“reg” type are used for assignments within the Verilog “always”

block, often use for sequential logic assignments, but not necessarily. For further explanation

see aVerilog reference book. Data types of the internal signals of the module can be referred t

o in table 3.We have now passed by all necessary declarations, and are now ready to look at th

e actual implementation. Using hardware description language allows us to describe the funct

ion of the transmitter in a more behavioral manner, rather than focus on it’

s actual implementation at gate level In software programming language, functions and proce

dures breaks larger programs into more readable, manageable and certainly maintainable piec

es. The Verilog language provides functions and tasks as constructs, analogous to software fu

nctions and procedures. A Verilog function and task are used as the equivalent to multiple lin

es of Verilog code, where certain inputs or signals affects certain outputs or variables. The use

of functions and tasks usually takes place where multiple lines of code are repeatedly used in

a design, and hence makes the design easier to read and certainly maintain. A Verilog functio

n can have multiple inputs, but always have only one output, while the Verilog task can have

both multiple inputs, and multiple outputs and even in some cases, non of each. Below is sho

wn the Verilog task, that hold all necessary sequential statements, to describe the transmitter i

n the “shift” mode

With the LabVIEW FPGA Module and NI RIO hardware, you now can use LabVIEW, a

high-level graphical development environment designed specifically for measurement and

control applications, to create PACs that have the customization, flexibility, and

high-performance of FPGAs. Because the LabVIEW FPGA Module configures custom

circuitry in hardware, your system can process and generate synchronized analog and digital

signals rapidly and deterministically. Figure 1 illustrates many of the NI RIO devices that you

can configure using the LabVIEW FPGA Module.

Figure 1. LabVIEW FPGA VI Block Diagram and RIO Hardware Platforms

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