6ES75050RA000AB0
6ES75050RA000AB0
6ES75050RA000AB0
6ES75050RA000AB0
6ES75050RA000AB0
PLC方案在具體設計時，包括以下幾個步驟：
a）獲取操作點數(shù)。了解配電網(wǎng)的基本情況及自動化的具體要求，確定系統(tǒng)需要進行遙控、遙信、遙測、甚至遙調(diào)的設備，統(tǒng)計各處配電房需要這4種信號的具體點數(shù)。
b）確定通信方案。根據(jù)配電網(wǎng)的規(guī)模及分布情況，確定總體設計方案，主要是通信方案的設計和選擇。
c）PLC選型。根據(jù)各處各種操作的點數(shù)以及所確定的通信方案，選擇恰當型號的PLC 來實現(xiàn)RTU功能。
由于RTU需接受監(jiān)控中心的指令，并上傳配電網(wǎng)、開關(guān)柜的信息，所以通信功能是選擇PLC的主要考慮因素。
由于各開關(guān)房、開關(guān)柜的操作類型、操作點數(shù)往往相差很大，因此，PLC是否具有模塊化結(jié)構(gòu)和組態(tài)能力，是否能夠靈活、經(jīng)濟地組成輸入點、輸出點、測量點（A／D）、調(diào)節(jié)點（D／A）的規(guī)?？勺兿到y(tǒng)，是選擇PLC型號的另一個主要考慮因素。
目前，很多廠家的產(chǎn)品，都可以滿足通信以及模塊化的要求。例如，SIEMENS的 S7－214以上系列，三菱的A1S系列，松下的較高級別的PLC系列等。根據(jù)具體情況，在一個配網(wǎng)自動化工程中，整個配電網(wǎng)系統(tǒng)可以選用同一個廠家的PLC，也可以根據(jù)配電房的具體情況，選用不同廠家的PLC，以利用各廠家PLC的優(yōu)勢和特色。
3 RTU功能的PLC實現(xiàn)
RTU功能的PLC實現(xiàn)包括硬件實現(xiàn)和軟件實現(xiàn)兩個方面。
3．1 硬件實現(xiàn)方面
在硬件方面，主要存在PLC的電源如何提供，PLC如何實現(xiàn)長距離的通信，遙控、遙信、遙測、遙調(diào)如何具體實現(xiàn)等問題。
由于PLC都有配套的專用電源模塊，因此在設計RTU時，主要應考慮電網(wǎng)斷電后PLC 的供電問題，通常以配置充電電池的方式解決。
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