LabVIEW_OPC_SIEMENS_PLC

对LabVIEW进行二次开发，对振动信号进行HHT时频分析(LabVIEW second development, vibration signals HHT time-frequency analysis)

this is a vi for labview programming

labview中用程序去产生一个触发事件是个难点，相关的介绍和例子并不多，本程序使用值属性信号结点改变的方法去产生一个事件，实现程序控制产生触发事件的功能，labview开发版本8.2。(labview using the program to generate a trigger event is difficult, relevant examples of the introduction are not many,here we use the value change of the node attribute of the signal to generate an event, the realized the program control functions to generate trigger events, the version of labview development is 8.2 .)

解决plc 与 labview 写的上位机通讯的 示范例子。

通过设定扫频范围及采样信息，产生一个chrip 信号。(generate a chirp signal, this vi could be used as a signal generation for free.)

labview的USRP实验指导书，包含理论，简单的程序框图，不含答案(DWC-USRP- Student Lab Manual)

labview利用mydaq输出正弦波，三角波，方波(LabVIEW uses mydaq to output sine wave, triangle wave, Fang Bo.)

几个练习使用Labview编程的产物，主要包括：1.正弦扫频信号发生器，可选择频率变化规律（不变、线性、指数变化）以及幅度变化规律（不变、线性、指数变化），还可以通过MathScript节点自定义频率、幅度变化规律； 2.声卡数据采集及频谱分析；3.会说话的小圆点；4.十六进制数布尔数组显示；5.在字符串中显示多种字体；6.钢琴键盘模拟(Several products by practicing Labview programming, including: 1 Sine sweep signal generator, selectable frequency variation (constant, linear, exponential change) and amplitude variation (constant, linear, exponential changes), you can also customize the frequency and amplitude variation through MathScript Node 2 sound card data acquisition and spectrum analysis 3 talking dots 4 hexadecimal to boolean array display 5 display a variety of fonts in the string 6. Piano keyboard simulation )

说明：  将直角坐标系数据转换成极坐标数据，以便绘制主轴轴心轨迹(Converting Cartesian coordinates into polar coordinates to plot axis center trajectory)

说明：  labview modbus协议下的串口通信(Serial communication under LabVIEW Modbus Protocol)