需求概述

本章要實現(xiàn)一個流程：EG8200采集西門子S7-200Smart的數據，并組裝成JSON格式通過HTTP上報應用平臺。

源-(S7轉Modbus-https://www.iotrouter.com/news/2150.html)

要采集的PLC點位表如下：

HTTP通信相關參數格式如下：

##數據推送
url:192.168.0.32:1880/api/device/reportData
method:POST

JSON格式:
{
  "deviceInfo": {
    "machineNumber": 9301,
    "machineGroupNumber": 1
  },
  "status": {
    "fan1ContactError": true,
    "fan2ContactError": false,
    "fan3ContactError": false,
    "inverterCommError": false,
    "motorHighTempAlarm": false,
    "temperatureStatusError": false
  },
  "data": {
    "oilPressure": 17.83,
    "suctionPressure": 3.7,
    "fuelLevel": 0.23,
    "cabinetTemperature": 237.2,
    "engineVoltage": 415.64,
    "engineCurrent": 65.1,
    "engineRuntime": 72.6,
    "pumpPressure": 85.3,
    "motor1Temperature": 20,
    "motor2Temperature": 19,
    "motor3Temperature": 19,
    "fan1Temperature": 21,
    "fan2Temperature": 33,
    "fan3Temperature": 26
  },
  "timestamp": "2022-7-08 11:28:55"
}

需求分析

在制作流程時，基礎的邏輯是根據數據走向來制作流程。其中主要工作分為三步：

第一步：通過S7協(xié)議讀取PLC變量數據，得到的數據存儲在內存中（西門子節(jié)點）

第二步：將數據按照JSON格式進行格式化（函數節(jié)點）

第三步：配置HTTP 請求參數

需求實現(xiàn)

1. 采集PLC數據

從節(jié)點庫拖入一個西門子節(jié)點，以及一個調試節(jié)點，調試節(jié)點用于查看讀取到的PLC數據集，方便定位問

雙擊西門子節(jié)點，根據需求概述的內容填寫對應的設置參數，如下圖所示：

IP:PLC的IP
端口:102(S7協(xié)議通信默認端口102)
采集周期:1000ms(默認2000ms,可自定義)
超時周期:2000ms(默認2000ms,可自定義)

數據點配置(根據幫助文檔可以找到對應關系)
V0.0
V0.6
V1.6
V2.5
I0.0
I0.1
VD4
VD8
VD12
VD16
VD20
VD24
VD28
VD32
VW120
VW750
VW2402
VW2404
VW2408
VW2410
VW2412

如果是連續(xù)地址，可配置起始地址并填寫讀取長度即可

如果設置正確，調試窗口會有日志打印，顯示的是讀取到的數據內容：

有的時候PLC數據點比較多，手動依次錄入比較繁瑣。節(jié)點支持數據點的導入導出或者參數傳遞的方式來讀?。?/p>

本例程用到的傳參方案，函數節(jié)點內的代碼如下：

msg.payload = [
    { func: "ReadBoolArray", body: { name: "", address: "V0", length: 8 } },
    { func: "ReadBoolArray", body: { name: "", address: "V1", length: 8 } },
    { func: "ReadBoolArray", body: { name: "", address: "V2", length: 8 } },
    { func: "ReadFloatArray", body: { name: "", address: "VD4", length: 8 } },
    { func: "ReadUInt16", body: { name: "", address: "VW120" } },
    { func: "ReadUInt16", body: { name: "", address: "VW750" } },
    { func: "ReadUInt16Array", body: { name: "", address: "VW2402", length: 6 } },
    { func: "ReadBoolArray", body: { name: "", address: "I0", length: 8 } }
]
return msg;

2. 數據格式化

根據步驟引導，在調試窗口可以看到讀到的PLC數據如下：

因為應用平臺已經規(guī)定了數據必須按照JSON格式上報。接下來使用函數節(jié)點Javascrip代碼將數據進行格式化，代碼如下：

class DeviceReport {
    constructor(machineNumber, machineGroupNumber) {
        this.deviceInfo = {
            machineNumber: machineNumber,
            machineGroupNumber: machineGroupNumber
        };
        this.status = {
            fan1ContactError: 0,
            fan2ContactError: 0,
            fan3ContactError: 0,
            inverterCommError: 0,
            motorHighTempAlarm: 0,
            temperatureStatusError: 0
        };
        this.data = {
            oilPressure: 0,
            suctionPressure: 0,
            fuelLevel: 0,
            cabinetTemperature: 0,
            engineVoltage: 0,
            engineCurrent: 0,
            engineRuntime: 0,
            pumpPressure: 0,
            motor1Temperature: 0,
            motor2Temperature: 0,
            motor3Temperature: 0,
            fan1Temperature: 0,
            fan2Temperature: 0,
            fan3Temperature: 0
        };
        this.timestamp = null;
    }

    // 設置狀態(tài)數據（1表示異常，0表示正常）
    setStatusData(statusData) {
        this.status = statusData;
    }

    // 設置傳感器數據
    setSensorData(sensorData) {
        this.data = sensorData;
    }

    // 設置時間戳
    setTimestamp(timestamp) {
        this.timestamp = timestamp;
    }
    generateReport() {
        return {
            deviceInfo: this.deviceInfo,
            status: this.status,
            data: this.data,
            timestamp: this.timestamp
        };
    }
}

function dateFormat(fmt, timestamp) {
    let ret;
    const opt = {
        "Y+": timestamp.getFullYear().toString(), // 年
        "m+": (timestamp.getMonth() + 1).toString(),  // 月
        "d+": timestamp.getDate().toString(), // 日
        "H+": timestamp.getHours().toString(), // 時
        "M+": timestamp.getMinutes().toString(), // 分
        "S+": timestamp.getSeconds().toString() // 秒
    };
    for (let k in opt) {
        ret = new RegExp("(" + k + ")").exec(fmt);
        if (ret) {
            fmt = fmt.replace(ret[1], (ret[1].length == 1) ? (opt[k]) : (opt[k].padStart(ret[1].length, "0")))
        };
    };
    return fmt;
}
function setValue(data) {
    var myDeviceReport = new DeviceReport(data.VW120, data.VW750)
    var v0 = data.V0
    var v1 = data.V1
    var v2 = data.V2
    var i0 = data.I0
    var vd4 = data.VD4
    var vd2402 = data.VW2402
    const fmt = dateFormat("YYYY-mm-dd HH:MM:SS", new Date())
    try {
        // 設置狀態(tài)數據
        const statusData = {
            fan1ContactError: v0[0],
            fan2ContactError: v0[6],
            fan3ContactError: v1[6],
            inverterCommError: v2[5],
            motorHighTempAlarm: i0[0],
            temperatureStatusError: i0[1]
        }
        myDeviceReport.setStatusData(statusData)

        // 設置傳感器數據
        const sensorData = {
            oilPressure: vd4[0],
            suctionPressure: vd4[1],
            fuelLevel: vd4[2],
            cabinetTemperature: vd4[3],
            engineVoltage: vd4[4],
            engineCurrent: vd4[5],
            engineRuntime: vd4[6],
            pumpPressure: vd4[7],
            motor1Temperature: vd2402[0],
            motor2Temperature: vd2402[1],
            motor3Temperature: vd2402[2],
            fan1Temperature: vd2402[3],
            fan2Temperature: vd2402[4],
            fan3Temperature: vd2402[5]
        }
        myDeviceReport.setSensorData(sensorData)
        // 設置時間戳
        myDeviceReport.setTimestamp(fmt)
        //生成JSON對象返回
        return myDeviceReport.generateReport()
    } catch (err) {
        node.error(err.message);
        return null
    }

}
var plcData = msg.payload
if (setValue(plcData)){
    msg.payload = JSON.stringify(setValue(plcData),null,2)
    return msg
}

復制以上代碼，粘貼到函數節(jié)點內，部署后即可看到效果：

可以看到，已經將讀到的PLC數據，按照需求要求轉換成了最終的JSON格式，且對數據進行了一定程度的計算（兩位小數）。此處只是函數節(jié)點的冰山一角，因為支持Javascrip語言編程，幾乎你能想到的任何功能都可以在這里實現(xiàn)。

3. 通過http周期上報

拖入一個HTTP節(jié)點，根據提示進行配置地址和請求方式，即可實現(xiàn)數據上報：

服務端返回成功，至此，數據上報已經完成，很簡單幾步即可實現(xiàn)：采集PLC數據并按照自定義JSON格式上報。

源碼

所有的流程支持以json格式導入導出，方便與其他人分享做好的流程。本章節(jié)的流程json文件如下，復制后在菜單欄右上角選擇導入粘貼即可，導出同理

[{"id":"edf0c4c538469caa","type":"Siemens","z":"5bb1b94e3403e2f2","name":"","protocol":"iplink_SiemensS7","IPAddress":"192.168.0.34","DestPort":"102","IPLinkTimeout":"2000","IPCommTimeout":"2000","Spname":"COM10","Baudrate":"9600","Databits":"8","Stopbit":"1","Paritybit":"0","RTSEnable":false,"SpLinktimeout":"2000","SpIntertimeout":"-1","workMode":"read","readMode":"trigger","readCyc":"1000","vartable":[],"SiemensS7Model":"5","SiemensS7ConnectionType":"1","SiemensS7Rack":"0","SiemensS7Slot":"0","SiemensS7LocalTSAP":"102","SiemensS7DestTSAP":"4D57","SiemensPPIStation":"2","stringvar":[],"customName":"Siemens:S7-S200Smart","x":510,"y":1080,"wires":[["be890e0383a04306"]]},{"id":"90be80aa485c48ae","type":"debug","z":"5bb1b94e3403e2f2","name":"調試 22","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":1020,"y":1080,"wires":[]},{"id":"2485d94e74e61614","type":"function","z":"5bb1b94e3403e2f2","name":"函數計算 18","func":"msg.payload = [n    { func: "ReadBoolArray", body: { name: "", address: "V0", length: 8 } },n    { func: "ReadBoolArray", body: { name: "", address: "V1", length: 8 } },n    { func: "ReadBoolArray", body: { name: "", address: "V2", length: 8 } },n    { func: "ReadFloatArray", body: { name: "", address: "VD4", length: 8 } },n    { func: "ReadUInt16", body: { name: "", address: "VW120" } },n    { func: "ReadUInt16", body: { name: "", address: "VW750" } },n    { func: "ReadUInt16Array", body: { name: "", address: "VW2402", length: 6 } },n    { func: "ReadBoolArray", body: { name: "", address: "I0", length: 8 } }n]nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":310,"y":1080,"wires":[["edf0c4c538469caa"]]},{"id":"8db3c718ecac3ed7","type":"inject","z":"5bb1b94e3403e2f2","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":150,"y":1080,"wires":[["2485d94e74e61614"]]},{"id":"be890e0383a04306","type":"function","z":"5bb1b94e3403e2f2","name":"函數計算 19","func":"class DeviceReport {n    constructor(machineNumber, machineGroupNumber) {n        this.deviceInfo = {n            machineNumber: machineNumber,n            machineGroupNumber: machineGroupNumbern        };n        this.status = {n            fan1ContactError: 0,n            fan2ContactError: 0,n            fan3ContactError: 0,n            inverterCommError: 0,n            motorHighTempAlarm: 0,n            temperatureStatusError: 0n        };n        this.data = {n            oilPressure: 0,n            suctionPressure: 0,n            fuelLevel: 0,n            cabinetTemperature: 0,n            engineVoltage: 0,n            engineCurrent: 0,n            engineRuntime: 0,n            pumpPressure: 0,n            motor1Temperature: 0,n            motor2Temperature: 0,n            motor3Temperature: 0,n            fan1Temperature: 0,n            fan2Temperature: 0,n            fan3Temperature: 0n        };n        this.timestamp = null;n    }nn    // 設置狀態(tài)數據（1表示異常，0表示正常）n    setStatusData(statusData) {n        this.status = statusData;n    }nn    // 設置傳感器數據n    setSensorData(sensorData) {n        this.data = sensorData;n    }nn    // 設置時間戳n    setTimestamp(timestamp) {n        this.timestamp = timestamp;n    }n    generateReport() {n        return {n            deviceInfo: this.deviceInfo,n            status: this.status,n            data: this.data,n            timestamp: this.timestampn        };n    }n}nnfunction dateFormat(fmt, timestamp) {n    let ret;n    const opt = {n        "Y+": timestamp.getFullYear().toString(), // 年n        "m+": (timestamp.getMonth() + 1).toString(),  // 月n        "d+": timestamp.getDate().toString(), // 日n        "H+": timestamp.getHours().toString(), // 時n        "M+": timestamp.getMinutes().toString(), // 分n        "S+": timestamp.getSeconds().toString() // 秒n    };n    for (let k in opt) {n        ret = new RegExp("(" + k + ")").exec(fmt);n        if (ret) {n            fmt = fmt.replace(ret[1], (ret[1].length == 1) ? (opt[k]) : (opt[k].padStart(ret[1].length, "0")))n        };n    };n    return fmt;n}nfunction setValue(data) {n    var myDeviceReport = new DeviceReport(data.VW120, data.VW750)n    var v0 = data.V0n    var v1 = data.V1n    var v2 = data.V2n    var i0 = data.I0n    var vd4 = data.VD4n    var vd2402 = data.VW2402n    const fmt = dateFormat("YYYY-mm-dd HH:MM:SS", new Date())n    try {n        // 設置狀態(tài)數據n        const statusData = {n            fan1ContactError: v0[0],n            fan2ContactError: v0[6],n            fan3ContactError: v1[6],n            inverterCommError: v2[5],n            motorHighTempAlarm: i0[0],n            temperatureStatusError: i0[1]n        }n        myDeviceReport.setStatusData(statusData)nn        // 設置傳感器數據n        const sensorData = {n            oilPressure: vd4[0],n            suctionPressure: vd4[1],n            fuelLevel: vd4[2],n            cabinetTemperature: vd4[3],n            engineVoltage: vd4[4],n            engineCurrent: vd4[5],n            engineRuntime: vd4[6],n            pumpPressure: vd4[7],n            motor1Temperature: vd2402[0],n            motor2Temperature: vd2402[1],n            motor3Temperature: vd2402[2],n            fan1Temperature: vd2402[3],n            fan2Temperature: vd2402[4],n            fan3Temperature: vd2402[5]n        }n        myDeviceReport.setSensorData(sensorData)n        // 設置時間戳n        myDeviceReport.setTimestamp(fmt)n        //生成JSON對象返回n        return myDeviceReport.generateReport()n    } catch (err) {n        node.error(err.message);n        return nulln    }nn}nvar plcData = msg.payloadnif (setValue(plcData)) {n    msg.payload = JSON.stringify(setValue(plcData), null, 2)n    return msgn}n","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":710,"y":1080,"wires":[["d140dc012c0cd68f"]]},{"id":"d140dc012c0cd68f","type":"http request","z":"5bb1b94e3403e2f2","name":"","method":"POST","ret":"txt","paytoqs":"ignore","url":"192.168.0.32:1880/api/device/reportData","tls":"","persist":false,"proxy":"","insecureHTTPParser":false,"authType":"","senderr":false,"headers":[],"x":860,"y":1080,"wires":[["90be80aa485c48ae"]]}]

審核編輯 黃宇