需求概述
本章要实现一个流程：EG8200采集西门子S7-200Smart的数据，并组装成JSON格式通过HTTP上报应用平台。
源-(S7转Modbus-https://www.iotrouter.com/news/2150.html)
要采集的PLC点位表如下：
| PLC | S7-200 Smart |
| IP | 192.168.0.34/102 |
| 点表(DB1) |
| 地址 | 数据类型 | 属性 | 名称 |
| V0.0 | Boolean | 只读 | 风机1接触器异常 |
| V0.6 | Boolean | 只读 | 风机2接触器异常 |
| V1.6 | Boolean | 只读 | 风机3接触器异常 |
| V2.5 | Boolean | 只读 | 变频器通讯故障 |
| I0.0 | Boolean | 只读 | 电机高温报警 |
| I0.1 | Boolean | 只读 | 温度状态异常 |
| VD4 | Float | 只读 | 油压工程值 |
| VD8 | Float | 只读 | 吸入压力工程值 |
| VD12 | Float | 只读 | 燃油油位工程值 |
| VD16 | Float | 只读 | 机柜温度值 |
| VD20 | Float | 只读 | 发动机电压值 |
| VD24 | Float | 只读 | 发动机电流值 |
| VD28 | Float | 只读 | 发动机工作时间 |
| VD32 | Float | 只读 | 泵压工程值 |
| VW120 | Unsigned16 | 只读 | 本机编号 |
| VW750 | Unsigned16 | 只读 | 本机组号 |
| VW2402 | Unsigned16 | 只读 | 电机1温度 |
| VW2404 | Unsigned16 | 只读 | 电机2温度 |
| VW2406 | Unsigned16 | 只读 | 电机3温度 |
| VW2408 | Unsigned16 | 只读 | 风机1温度 |
| VW2410 | Unsigned16 | 只读 | 风机2温度 |
| VW2412 | Unsigned16 | 只读 | 风机3温度 |
HTTP通信相关参数格式如下：
##数据推送url:192.168.0.32:1880/api/device/reportDatamethod:POSTJSON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
在制作流程时，基础的逻辑是根据数据走向来制作流程。其中主要工作分为三步：
步：通过S7协议读取PLC变量数据，得到的数据存储在内存中（西门子节点）
第二步：将数据按照JSON格式进行格式化（函数节点）
第三步：配置HTTP 请求参数
需求实现
1. 采集PLC数据
从节点库拖入一个西门子节点，以及一个调试节点，调试节点用于查看读取到的PLC数据集，方便定位问
双击西门子节点，根据需求概述的内容填写对应的设置参数，如下图所示：
IP:PLC的IP端口:102(S7协议通信默认端口102)采集周期:1000ms(默认2000ms,可自定义)超时周期:2000ms(默认2000ms,可自定义)数据点配置(根据帮助文档可以找到对应关系)V0.0V0.6V1.6V2.5I0.0I0.1VD4VD8VD12VD16VD20VD24VD28VD32VW120VW750VW2402VW2404VW2408VW2410VW2412如果是连续地址，可配置起始地址并填写读取长度即可
如果设置正确，调试窗口会有日志打印，显示的是读取到的数据内容：
有的时候PLC数据点比较多，手动依次录入比较繁琐。节点支持数据点的导入导出或者参数传递的方式来读取：
本例程用到的传参方案，函数节点内的代码如下：
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. 数据格式化
根据步骤引导，在调试窗口可以看到读到的PLC数据如下：
因为应用平台已经规定了数据必须按照JSON格式上报。使用函数节点Javascrip代码将数据进行格式化，代码如下：
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; } // 设置状态数据（1表示异常，0表示正常） setStatusData(statusData) { this.status = statusData; } // 设置传感器数据 setSensorData(sensorData) { this.data = sensorData; } // 设置时间戳 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(), // 时 "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 { // 设置状态数据 const statusData = { fan1ContactError: v0[0], fan2ContactError: v0[6], fan3ContactError: v1[6], inverterCommError: v2[5], motorHighTempAlarm: i0[0], temperatureStatusError: i0[1] } myDeviceReport.setStatusData(statusData) // 设置传感器数据 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) // 设置时间戳 myDeviceReport.setTimestamp(fmt) //生成JSON对象返回 return myDeviceReport.generateReport() } catch (err) { node.error(err.message); return null }}var plcData = msg.payloadif (setValue(plcData)){ msg.payload = JSON.stringify(setValue(plcData),null,2) return msg}
复制以上代码，粘贴到函数节点内，部署后即可看到效果：
可以看到，已经将读到的PLC数据，按照需求要求转换成了终的JSON格式，且对数据进行了一定程度的计算（两位小数）。此处只是函数节点的冰山一角，因为支持Javascrip语言编程，几乎你能想到的任何功能都可以在这里实现。
3. 通过http周期上报
拖入一个HTTP节点，根据提示进行配置地址和请求方式，即可实现数据上报：
服务端返回成功，至此，数据上报已经完成，很简单几步即可实现：采集PLC数据并按照自定义JSON格式上报。
源码
所有的流程支持以json格式导入导出，方便与其他人分享做好的流程。本章节的流程json文件如下，复制后在菜单栏右上角选择导入粘贴即可，导出同理
[{"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":"调试 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":"函数计算 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":"函数计算 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 // 设置状态数据（1表示异常，0表示正常）n setStatusData(statusData) {n this.status = statusData;n }nn // 设置传感器数据n setSensorData(sensorData) {n this.data = sensorData;n }nn // 设置时间戳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(), // 时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 // 设置状态数据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 // 设置传感器数据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 // 设置时间戳n myDeviceReport.setTimestamp(fmt)n //生成JSON对象返回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"]]}]
