Node-Red & Modbus TCP/IP ADAM6017 Analog in /Data out

 Node-Red & Modbus TCP/IP ADAM6017 Analog in /Data out

計算直線方程

直線方程可以用多種形式表示，以下是幾種常見的直線方程公式：點斜式方程：y – y1 = m(x – x1)，其中 m 為斜率，(x1, y1) 為直線上的一點。 m= (y2 – y1)/(x2 – x1)

1) pc 與 adam6017 同網段

2) 利用 Advantech ADAM/APAX Utility (Win32) 設定Adam6017

3) ModBus FC function code 功能碼

4) 轉換 公式   4mA-20mA 轉成 0-65535 

var D0= msg.payload.data[0];

var maxRange = 20 ;

var minRange = 4;

var range = 65535 / (20 - minRange);

msg.payload = ((D0 / range)+minRange).toFixed(3);

return msg;

4) 轉換 公式   4mA-20mA 轉成 0-100% , 0-100°C 

var x=msg.payload;

var y2=100,y1=0;

var x2=20 ,x1=4 ;

var m= (y2-y1)/ (x2-x1) ;

var y= m* (x-x1)  + y1 ;

msg.payload=parseFloat(y).toFixed( 2 );

return msg;

5) 線路圖與實驗結果

6) Node-Red 程式

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