需求概述

本章主要實現(xiàn)一個流程：EG8200采集西門子S7-200smart的數(shù)據(jù)，并將數(shù)據(jù)存儲在Modbus寄存器中，等待外部主機通過Modbus TCP協(xié)議來讀取。

要采集的PLC的IP及端口：

需求分析

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

1.通過西門子S7協(xié)議讀取PLC的數(shù)據(jù)，得到的數(shù)據(jù)存儲在內(nèi)存中(西門子節(jié)點)

2.將數(shù)據(jù)進行格式化(函數(shù)節(jié)點)

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

4.外部主機連接主動讀取

需求實現(xiàn)

1.采集PLC數(shù)據(jù)

從節(jié)點庫拖入一個S7讀數(shù)據(jù)節(jié)點，以及一個調(diào)試節(jié)點，調(diào)試節(jié)點用于查看讀取到的PLC的數(shù)據(jù)，方便定位問題：

雙擊西門子節(jié)點，根據(jù)需求概述的內(nèi)容填寫對應(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讀取長度即可

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

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

本例程用到的傳參代碼如下：

2.數(shù)據(jù)進行格式化

使用函數(shù)節(jié)點將PLC數(shù)據(jù)處理成對應(yīng)格式：

數(shù)據(jù)格式化參考代碼如下：

3.存儲到Modbus寄存器

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

使用TCP IN節(jié)點和TCP OUT節(jié)點搭配實現(xiàn)TCP 服務(wù)端：

使用上位機(Modbus Poll軟件)通過Modbus TCP來讀取映射的數(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)計算 31","func":"msg.payload = [\n{ func: \"ReadBoolArray\", body: { name: \"\", address: \"I0\", length: 8 } },\n{ func: \"ReadFloatArray\", body: { name: \"\", address: \"VD20\", length: 4 } },\n{ func: \"ReadUInt16Array\", body: { name: \"\", address: \"VW36\", length: 4 } }\n]\nreturn 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)計算 33","func":"var discretes = []\nvar holdings = []\nvar data = msg.payload\ndiscretes = data.I0\nholdings[0] = data.VD20[0]\nholdings[2] = data.VD20[1]\nholdings[4] = data.VD20[2]\nholdings[6] = data.VD20[3]\nholdings[8] = data.VW36[0]\nholdings[9] = data.VW36[1]\nholdings[10] = data.VW36[2]\nholdings[11] = data.VW36[3]\nmsg.discretes = discretes\nmsg.holdings = holdings\nreturn 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":[]}]

 西門子S7協(xié)議與Modbus協(xié)議之間的轉(zhuǎn)換，是工業(yè)自動化領(lǐng)域常見的需求之一。通過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。在實施過程中，合理配置地址映射和通信參數(shù)，能有效提升系統(tǒng)的可靠性和實時性，為工業(yè)自動化系統(tǒng)的優(yōu)化和擴展提供堅實的基礎(chǔ)。