6SN1124-1AB00-0BA2

6SN1124-1AB00-0BA2

西門子作為最早進入中國市場的工控廠家，其市場占有率一直非常高。西門子PLC的品質非常好，其網絡穩定性、開放性深受工控人員的喜愛，而且編程軟件分類多，使用方便。在國內工控界具有顯著地位。雖然大家對西門子PLC都有一定的了解，但要你說出西門子PLC各種通信方式的特點，相信很多人都不能完整答出。下面就是幾種常見的西門子通信方式？

一、PPI通訊

PPI協議是S7-200CPU最基本的通信方式，通過原來自身的端口（PORT0或PORT1）就可以實現通信，是S7-200 CPU默認的通信方式。

二、RS485串口通訊

第三方設備大部分支持，西門子S7 PLC可以通過選擇自由口通信模式控制串口通信。最簡單的情況是只用發送指令（XMT）向打印機或者變頻器等第三方設備發送信息。不管任何情況，都必須通過S7 PLC編寫程序實現。

當選擇了自由口模式，用戶可以通過發送指令（XMT）、接收指令（RCV）、發送中斷、接收中斷來控制通信口的操作。

三、MPI通訊

MPI通信是一種比較簡單的通信方式，MPI網絡通信的速率是19.2Kbit/s~12Mbit/s，MPI網絡最多支持連接32個節點，最大通信距離為50M。通信距離遠，還可以通過中繼器擴展通信距離，但中繼器也占用節點。

MPI網絡節點通常可以掛S7-200、人機介面、編程設備、智能型ET200S及RS485中繼器等網絡元器件。

西門子PLC與PLC之間的MPI通信一般有3種通信方式：

1、全局數據包通信方式

2、無組態連接通信方式

3、組態連接通信方式

四、以太網通訊

以太網的核心思想是使用共享的公共傳輸通道，這個思想早在1968年來源于廈威爾大學。 1972年，Metcalfe和David Boggs（兩個都是著名網絡專家）設置了一套網絡，這套網絡把不同的ALTO計算機連接在一起，同時還連接了EARS激光打印機。這就是世界上第一個個人計算機局域網，這個網絡在1973年5月22日首次運行。Metcalfe在首次運行這天寫了一段備忘錄，備忘錄的意思是把該網絡改名為以太網（Ethernet），其靈感來自于“電磁輻射是可以通過發光的以太來傳播”這一想法。 1979年，DEC、Intel和Xerox共同將網絡標準化。

1984年，出現了細電纜以太網產品，后來陸續出現了粗電纜、雙絞線、CATV同軸電纜、光纜及多種媒體的混合以太網產品。 以太網是目前世界上最流行的拓樸標準之一，具有傳傳播速率高、網絡資源豐富、系統功能強、安裝簡單和使用維護方便等很多優點。

五、PROFIBUS-DP通訊

PROFIBUS-DP現場總線是一種開放式現場總線系統，符合歐洲標準和國際標準。PROFIBUS-DP通信的結構非常精簡，傳輸速度很高且穩定，非常適合PLC與現場分散的I/O設備之間的通信

福建點碩自動化設備有限公司重點推出以下品牌產品，價優，歡迎新老客戶咨詢！

【主營產品】主營：世界知名品牌的PLC 、DCS 系統備件 模塊

〖⒈〗Allen-Bradley(美國AB)系列產品》

〖⒉〗Schneider(施耐德電氣)系列產品》

〖⒊〗General electric(通用電氣)系列產品》

〖⒋〗Westinghouse（美國西屋）系列產品》

〖⒌〗SIEMENS(西門子系列產品)》

〖⒍〗銷售ABB Robots. FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、Panasonic Robots、MOTOMAN Robots。

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   福建點碩自動化設備有限公司重點推出以下品牌產品，價優，歡迎新老客戶咨詢！

【主營產品】主營：世界知名品牌的PLC 、DCS 系統備件 模塊

〖⒈〗Allen-Bradley(美國AB)系列產品》

〖⒉〗Schneider(施耐德電氣)系列產品》

〖⒊〗General electric(通用電氣)系列產品》

〖⒋〗Westinghouse（美國西屋）系列產品》

〖⒌〗SIEMENS(西門子系列產品)》

〖⒍〗銷售ABB Robots. FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、Panasonic Robots、MOTOMAN Robots。

〖⒎〗Westinghouse（西屋）： OVATION系統、WDPF系統、MAX1000系統備件。

〖⒏〗Invensys Foxboro（?？怂共_）：I/A Series系統，FBM（現場輸入/輸出模塊）順序控制、梯形邏輯控制、事故追憶處理、數模轉換、輸入/輸出信號處理、數據通信及處理等。Invensys Triconex:

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PCU20/50 PC處理器:
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