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
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
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msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":390,"y":240,"wires":[["9f12791d682f8767","d82fa7435f095570"]]},{"id":"9f12791d682f8767","type":"debug","z":"19ce39ded2268bc9","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":590,"y":200,"wires":[]},{"id":"4fbd61cb577961a6","type":"function","z":"19ce39ded2268bc9","name":"","func":"var D2= msg.payload.data[2];\n\nvar maxRange = 20 ;\nvar minRange = 4;\nvar range = 65535 / (20 - minRange);\n\nmsg.payload = ((D2 / range)+minRange).toFixed(3);\nreturn msg;\n\n//var y=((20-4)/(65536-0))*D2+4\n//msg.payload=y;\n//return msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":390,"y":340,"wires":[["13b2406aa0c47c71","fb397dd725d1c697"]]},{"id":"13b2406aa0c47c71","type":"debug","z":"19ce39ded2268bc9","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":590,"y":340,"wires":[]},{"id":"a4339977c08663e7","type":"function","z":"19ce39ded2268bc9","name":"","func":"var x=msg.payload;\n//var y= (x-4)/0.16\nvar y2=100,y1=0;\nvar x2=20 ,x1=4 ;\nvar m= (y2-y1)/ (x2-x1) ;\nvar y= m* (x-x1) + y1 ;\nmsg.payload=parseFloat(y).toFixed( 2 );\nreturn msg;\n\n\n// 4mA----0\n//20mA----100\n// (20-4)/(100-0) = 0.16\n//y= (x-4) / 0.16\n//\n//1)\t m=(y2-y1)/(x2-x1)= (100-0)/(20-4) \n//2)\t y= mx+k \n//3)\t y= (100-0)/(20-4) * (x-4) + 0\n//4)\t If x= 4 then y=0 , x=20 then y=100\n\n//m= (y2-y1)/(x2-x1)\t\n//y= m (x-x1) + y1\t\n\n","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":570,"y":120,"wires":[["de1dfb0910dc87df","6521cfa3203d42b1"]]},{"id":"de1dfb0910dc87df","type":"debug","z":"19ce39ded2268bc9","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":850,"y":160,"wires":[]},{"id":"d82fa7435f095570","type":"function","z":"19ce39ded2268bc9","name":"","func":"var x=msg.payload;\n\nvar y2=100,y1=0;\nvar x2=20 ,x1=4 ;\nvar m= (y2-y1)/ (x2-x1) ;\nvar y= m* (x-x1) + y1 ;\nmsg.payload=parseFloat(y).toFixed( 2 );\nreturn msg;\n\n\n// 4mA----0\n//20mA----100\n// (20-4)/(100-0) = 0.16\n//y= (x-4) / 0.16\n//","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":570,"y":240,"wires":[["952d2bf2546734a8","56afb0bb859ba303"]]},{"id":"952d2bf2546734a8","type":"debug","z":"19ce39ded2268bc9","name":"","active":false,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":850,"y":280,"wires":[]},{"id":"fb397dd725d1c697","type":"function","z":"19ce39ded2268bc9","name":"","func":"var x=msg.payload;\n\nvar y2=100,y1=0;\nvar x2=20 ,x1=4 ;\nvar m= (y2-y1)/ (x2-x1) ;\nvar y= m* (x-x1) + y1 ;\nmsg.payload=parseFloat(y).toFixed( 2 );\nreturn msg;\n\n\n// 4mA----0\n//20mA----100\n// (20-4)/(100-0) = 0.16\n//y= (x-4) / 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