LabVIEW FPGA模块：开发工业自动化控制器的创新路径

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本篇论文深入探讨了利用LabVIEW FPGA模块开发可编程自动化控制器（Programmable Automation Controllers，简称PACs）的理论与实践。PACs在工业控制市场中正日益受到青睐，它们能够满足那些对高度集成的模拟和数字输入/输出（I/O）、浮点处理以及与多个处理节点无缝连接的应用需求。National Instruments公司提供了一系列PAC解决方案，这些方案的核心是基于统一的软件开发环境NI LabVIEW。通过LabVIEW，研究人员和工程师能够利用LabVIEW FPGA模块构建针对工业应用的定制I/O接口。LabVIEW FPGA模块结合了可重构输入/输出（Reconfigurable Input/Output，RIO）硬件，使得将现场可编程门阵列（Field-Programmable Gate Array，FPGA）技术的灵活性和定制化无缝融入工业PAC系统成为可能。相较于底层硬件描述语言（Hardware Description Languages，HDLs）和板级硬件设计细节，用户无需深入了解即可在一系列RIO硬件目标平台上定义嵌入式逻辑，从而实现快速而直观的设计过程。此外，论文详细解释了如何利用LabVIEW FPGA模块进行系统设计，包括硬件描述的简化、模块化设计方法，以及如何优化性能和功耗。作者可能会探讨相关的示例项目、编程技巧以及如何调试和验证在实际工业环境中运行的FPGA代码。这篇论文不仅提供了技术性的指导，还可能包含对FPGA技术在工业自动化控制领域未来发展趋势的分析。这篇论文对于想要在LabVIEW环境下使用FPGA技术进行自动化控制器开发的研究生、工程师或研究者来说，是一份宝贵的参考资料，它涵盖了从基础概念到实战应用的全面内容，对于提升工业控制系统的设计能力和创新能力具有重要意义。

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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LabVIEW FPGA模块：开发工业自动化控制器的创新路径

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