Question

我正在尝试为Node js中的PLC写一个简单的scada。在同一个应用程序中，它分别监听端口9007和9001的tcp和http服务器。从plc发送的值应在网络中更新。这是我的代码

'use strict';
var socket = require('socket.io');
var express = require('express');
var app = express();
app.use(express.static('public'));
var gid = require('uniqid');

var server = app.listen(9001, function () {
    console.log("server listening port 9001");
});

var io = socket(server);

io.on('connection', function (socket) {
    console.log("new web client connected", socket.id);

    socket.on('chat', function (dataobj) {
    var buffr = Buffer.from(GetSocketByPLCID(dataobj.station_id).plc.data);

    var prv_data ={
            station_id: "oooo",
            batt_stat: ((buffr[5]+(buffr[6] << 8))*0.0032).toFixed(2).toString(), 
            turb_vol: ((buffr[7]+(buffr[8] << 8))/10).toFixed(2).toString(),
            inlet_pr: ((buffr[9]+(buffr[10] << 8))*0.00175).toFixed(2).toString(),
            outlet_pr: ((buffr[11]+(buffr[12] << 8))*0.00175).toFixed(2).toString(),
            flowrate: ((buffr[11]+(buffr[12] << 8))*6.387).toFixed(2).toString(),
            opening: ((buffr[11]+(buffr[12] << 8))*0.08516).toFixed(2).toString(), // flowrate*0.62
            set_val: ((buffr[15]+(buffr[16] << 8))/100).toFixed(2).toString(),
            total_flow: (buffr[17]+(buffr[18] << 8)+(buffr[19] << 16)+(buffr[20] << 24)).toString()
            }

        var flashed = socket.emit('chat', prv_data);
        if(flashed){
            console.log(buffr)
        } else{socket.pause();}
    });

    socket.on('drain', function(){socket.resume();})

    socket.on('disconnect',function() 
    {
        console.log("webclient disconnected");
    });
});

/////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////
///// TCP server

var plc_socket_info ={};
var plc_socket_arr=[];
var net = require('net');
var TCPserver = new net.createServer();
TCPserver.listen(9007, function () {
console.log("TCP server running @ 9007");
});

function GetSocketByPLCID(PLCstationID)
{
    function searchs(plc_socket_arr) {
        try
        { 
        return plc_socket_arr.plc.stn_id === PLCstationID;
        } 
        catch (err){return}
    }
    return plc_socket_arr.find(searchs); 
}


TCPserver.on('connection', function (tcpsocket) {

    console.log("New client connected");
    TCPserver.getConnections(function(err,count_connections){ 
        console.log(count_connections.toString() + " PLC(s) are connected");
    })

    tcpsocket.plc={stn_id: 'xxxx', data: 'hxxxx0000000000000000y'}
    plc_socket_arr.push(tcpsocket);
    tcpsocket.setEncoding = 'utf8';

    let tcpdata;
    tcpsocket.on("data", function (data) 
    {
        var txt_data = data.toString('utf8');
        console.log(data);
        var buffr = new Buffer(data);

        if (txt_data.substr(0,1)==='h')
            {
                    var stn_id = txt_data.substr(1,4);
                    try{plc_socket_arr[plc_socket_arr.indexOf(tcpsocket)].plc = {stn_id: stn_id, data: txt_data}} catch (err){if(err){console.log(err.toString())}};

    });


function terminatePLC(){
    tcpsocket.end(function()
    {
      plc_socket_arr.splice(plc_socket_arr.indexOf(tcpsocket),1);  
      console.log("socket destroyed for time out");
      console.log(plc_socket_arr);
      }
  );
}

    tcpsocket.on("error", function (err) {
        console.log('error: ',err.message);
        terminatePLC();
    });

    tcpsocket.setTimeout(3000,function() {
        console.log("socket will end..")
        terminatePLC(); 
    });
});

在这里，我将传入的plc保存到具有适当ID的对象数组中，并保持更新。当我从网络上打电话时，index.html不断将请求发送到服务器，并使用该ID在该数组上进行搜索并发出。我的问题是，在网站上停止4-5分钟的值更新后。我观察到plc（tcp 9007）可以被ping通，但停止发送数据。重新启动plc客户端只能解决该问题...我不确定为什么会这样。请提出任何解决方案。

TCP客户端停止发送数据，Web客户端中的值更新停止

0 个答案: