需求概述

本章主要實(shí)現(xiàn)一個(gè)流程：EG8200采集西門(mén)子S7-200smart的數(shù)據(jù)，并將數(shù)據(jù)存儲(chǔ)在Modbus寄存器中，等待外部主機(jī)通過(guò)Modbus TCP協(xié)議來(lái)讀取。

要采集的PLC的IP及端口：

需求分析

在制作流程時(shí)，基礎(chǔ)的邏輯是根據(jù)功能實(shí)現(xiàn)來(lái)制作流程。該需求經(jīng)過(guò)分析可以得出，主要分為PLC數(shù)據(jù)讀取與存儲(chǔ)、Modbus TCP通信兩個(gè)部分。

1.通過(guò)西門(mén)子S7協(xié)議讀取PLC的數(shù)據(jù)，得到的數(shù)據(jù)存儲(chǔ)在內(nèi)存中(西門(mén)子節(jié)點(diǎn))

2.將數(shù)據(jù)進(jìn)行格式化(函數(shù)節(jié)點(diǎn))

3.將格式化后的數(shù)據(jù)存儲(chǔ)到寄存器中(Modbus Server節(jié)點(diǎn))

4.外部主機(jī)連接主動(dòng)讀取

需求實(shí)現(xiàn)

1.采集PLC數(shù)據(jù)

從節(jié)點(diǎn)庫(kù)拖入一個(gè)S7讀數(shù)據(jù)節(jié)點(diǎn)，以及一個(gè)調(diào)試節(jié)點(diǎn)，調(diào)試節(jié)點(diǎn)用于查看讀取到的PLC的數(shù)據(jù)，方便定位問(wèn)題：

雙擊西門(mén)子節(jié)點(diǎn)，根據(jù)需求概述的內(nèi)容填寫(xiě)對(duì)應(yīng)的設(shè)置參數(shù)，如下圖所示：

如果是連續(xù)地址，可配置起始地址并填寫(xiě)讀取長(zhǎng)度即可

如果設(shè)置正確，調(diào)試窗口會(huì)有日志打印，顯示的是讀取到的數(shù)據(jù)內(nèi)容：

有的時(shí)候PLC數(shù)據(jù)點(diǎn)比較多，手動(dòng)依次錄入比較繁瑣。節(jié)點(diǎn)支持?jǐn)?shù)據(jù)點(diǎn)的導(dǎo)入導(dǎo)出或者參數(shù)傳遞的方式來(lái)讀取：

本例程用到的傳參代碼如下：

2.數(shù)據(jù)進(jìn)行格式化

使用函數(shù)節(jié)點(diǎn)將PLC數(shù)據(jù)處理成對(duì)應(yīng)格式：

數(shù)據(jù)格式化參考代碼如下：

3.存儲(chǔ)到Modbus寄存器

使用Modbus服務(wù)節(jié)點(diǎn)，將格式化的數(shù)據(jù)傳入，并配置存儲(chǔ)方式：

使用TCP IN節(jié)點(diǎn)和TCP OUT節(jié)點(diǎn)搭配實(shí)現(xiàn)TCP 服務(wù)端：

使用上位機(jī)(Modbus Poll軟件)通過(guò)Modbus TCP來(lái)讀取映射的數(shù)據(jù)：

源碼

[{"id":"ac557854c44a5144","type":"Siemens","z":"a73a8f4565433249","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":"2000","vartable":[],"SiemensS7Model":"5","SiemensS7ConnectionType":"1","SiemensS7Rack":"0","SiemensS7Slot":"0","SiemensS7LocalTSAP":"0","SiemensS7DestTSAP":"0","SiemensPPIStation":"2","stringvar":[],"customName":"Siemens:S7-S200Smart","x":670,"y":1080,"wires":[["416b9e28dcbaffa9"]]},{"id":"06b785ae918b8f6a","type":"debug","z":"a73a8f4565433249","name":"調(diào)試 278","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":1260,"y":1140,"wires":[]},{"id":"db188f4ed1966c88","type":"function","z":"a73a8f4565433249","name":"函數(shù)計(jì)算 31","func":"msg.payload = [
{ func: "ReadBoolArray", body: { name: "", address: "I0", length: 8 } },
{ func: "ReadFloatArray", body: { name: "", address: "VD20", length: 4 } },
{ func: "ReadUInt16Array", body: { name: "", address: "VW36", length: 4 } }
]
return msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":430,"y":1080,"wires":[["ac557854c44a5144"]]},{"id":"425a932dfda4e617","type":"inject","z":"a73a8f4565433249","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":230,"y":1080,"wires":[["db188f4ed1966c88"]]},{"id":"416b9e28dcbaffa9","type":"function","z":"a73a8f4565433249","name":"函數(shù)計(jì)算 33","func":"var discretes = []
var holdings = []
var data = msg.payload
discretes = data.I0
holdings[0] = data.VD20[0]
holdings[2] = data.VD20[1]
holdings[4] = data.VD20[2]
holdings[6] = data.VD20[3]
holdings[8] = data.VW36[0]
holdings[9] = data.VW36[1]
holdings[10] = data.VW36[2]
holdings[11] = data.VW36[3]
msg.discretes = discretes
msg.holdings = holdings
return msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":870,"y":1080,"wires":[["539601edce2e5927"]]},{"id":"539601edce2e5927","type":"modbusServer","z":"a73a8f4565433249","name":"","uid":1,"model":"2","coils":100,"discretes":100,"holdings":100,"input":100,"columns":[{"Type":"3","Address":"0","Method":"7"},{"Type":"3","Address":"2","Method":"7"},{"Type":"3","Address":"4","Method":"7"},{"Type":"3","Address":"6","Method":"7"}],"x":1100,"y":1080,"wires":[["815f45a3a40a372a"],["06b785ae918b8f6a"]]},{"id":"fbadcb99655853f9","type":"tcp in","z":"a73a8f4565433249","name":"","server":"server","host":"","port":"502","datamode":"stream","datatype":"buffer","newline":"","topic":"","trim":false,"base64":false,"tls":"","x":870,"y":1040,"wires":[["539601edce2e5927"]]},{"id":"815f45a3a40a372a","type":"tcp out","z":"a73a8f4565433249","name":"","host":"","port":"","beserver":"reply","base64":false,"end":false,"tls":"","x":1270,"y":1060,"wires":[]}]

 西門(mén)子S7協(xié)議與Modbus協(xié)議之間的轉(zhuǎn)換，是工業(yè)自動(dòng)化領(lǐng)域常見(jiàn)的需求之一。通過(guò)硬件縱橫智控公司的產(chǎn)品EG8200可以確保設(shè)備之間的數(shù)據(jù)通信順暢。在實(shí)施過(guò)程中，合理配置地址映射和通信參數(shù)，能有效提升系統(tǒng)的可靠性和實(shí)時(shí)性，為工業(yè)自動(dòng)化系統(tǒng)的優(yōu)化和擴(kuò)展提供堅(jiān)實(shí)的基礎(chǔ)。