描述
系統(tǒng)內(nèi)部的傳感器和執(zhí)行機構(gòu)，都可能用通信的方式與PLC交換信息。隨著它們智能化程度的提高，這種方式也日益增多。
系統(tǒng)內(nèi)部的人機對話裝置與PLC交換信息，也就是本文重點介紹的PLC-GOT系統(tǒng)。而且在必要時，可能同時配備多個GOT同時工作。這些都完全依靠直接或間接地通信來完成。
PLC系統(tǒng)與它的上位機之間的通信。應(yīng)用實踐表明：分布式控制系統(tǒng)可以綜合計算機和PLC的長處，彌補它們各自功能上的不足，實現(xiàn)控制與管理一體化。這種分布式控制系統(tǒng)在工廠自動化(FA)、柔性制造系統(tǒng)(FMS)以及計算機集成制造系統(tǒng)(CIMS)中可以發(fā)揮重要的作用。
有的實時控制系統(tǒng)，由于其重要性而備有“冗余系統(tǒng)”。一旦系統(tǒng)發(fā)生故障，處于熱備用狀態(tài)的相同系統(tǒng)將會立即接管原來的控制任務(wù)，確保安全。這其中通信工作起了不可替代的作用。
在功能相近、距離不遠但又相對獨立的、數(shù)個同序列的PLC小系統(tǒng)之間，可能構(gòu)建N:N的簡易通信?？梢栽O(shè)定其中之一為主機，其他為從機。每一臺機器都有自己的編號，交換數(shù)量有限的數(shù)據(jù)。
兩臺并聯(lián)運行，構(gòu)成1:1的模式，可以共享被指定的部分信息，操作十分簡單。
簡單固定信息的無協(xié)議通信。例如系統(tǒng)與它的打印機、條碼掃描機或個人計算機之間的通信。
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