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FPGA-PLC-based multi-channel position measurement system
ISA Transactions ( IF 7.3 ) Pub Date : 2021-01-09 , DOI: 10.1016/j.isatra.2021.01.012
Dhruv M Patel 1 , Ankit K Shah 2
Affiliation  

The existing Programmable Logic Controller (PLC) based on microprocessors (μp) or micro-controllers (μc) are commonly used in the industry for various instrumentation and control applications. PLC exhibits limitations such as less flexibility, poor scanning time, slower speed, and degraded response for high-speed industrial applications due to its fixed hardware and serial execution mechanism. A new Field Programmable Gate Array (FPGA) based PLC multi-channel High Speed Counter (HSC) module has been proposed, enhancing performance and flexibility compared to the existing PLC-HSC module. The proposed FPGA-PLC-HSC module has a 2-phase 2-Input counter with resolutions of 1X, 2X, and 4X which improve performance in terms of accuracy for position speed, and direction measurement applications. The FPGA-PLC-HSC module is implemented with the feedback node method and the shift register method inside LabVIEW FPGA along with device utilization. The simulation results show that the FPGA-PLC-HSC module has faster scanning time, good linearity, better resolution, maximum supporting input frequency, and counting frequency. For experimental purposes, an optical encoder M110960 (E8P-512-118-S-D-M-B) with a signal conditioning circuit is connected to the NI-myRIO-1900 FPGA platform. The experimental results point out that the proposed FPGA-PLC-HSC module offers faster scanning time, better accuracy and linearity in 1X, 2X, and 4X resolution.



中文翻译:

基于FPGA-PLC的多通道位置测量系统

现有的基于微处理器的可编程逻辑控制器(PLC)(μp) 或微控制器 (μc) 在工业中通常用于各种仪表和控制应用。由于其固定的硬件和串行执行机制,PLC 表现出诸如灵活性较低、扫描时间短、速度较慢以及对高速工业应用的响应下降等局限性。提出了一种新的基于现场可编程门阵列 (FPGA) 的 PLC 多通道高速计数器 (HSC) 模块,与现有的 PLC-HSC 模块相比,提高了性能和灵活性。建议的 FPGA-PLC-HSC 模块具有 2 相 2 输入计数器,分辨率为 1X、2X 和 4X,可提高位置速度和方向测量应用精度方面的性能。FPGA-PLC-HSC模块通过LabVIEW FPGA内部的反馈节点方法和移位寄存器方法以及设备利用率来实现。仿真结果表明,FPGA-PLC-HSC模块具有更快的扫描时间、良好的线性度、更好的分辨率、最大支持输入频率和计数频率。出于实验目的,带有信号调理电路的光学编码器 M110960 (E8P-512-118-SDMB) 连接到 NI-myRIO-1900 FPGA 平台。实验结果表明,所提出的 FPGA-PLC-HSC 模块在 1X、2X 和 4X 分辨率下提供更快的扫描时间、更好的精度和线性度。

更新日期:2021-01-09
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