140CPU65260C
140CPU65260C140CPU65260C按I/O點數和功能分類
可編程控制器用于對外部設備的控制,外部信號的輸入、PLC的運算結果的輸出都要通過PLC輸入輸出端子來進行接線,輸入、輸出端子的數目之和被稱作PLC的輸入、輸出點數,簡稱I/O點數。
由I/O點數的多少可將PLC的I/O點數分成小型、中型和大型。
小型PLC的I/O點數小于256點,以開關量控制為主,具有體積小、價格低的優(yōu)點??捎糜陂_關量的控制、定時/計數的控制、順序控制及少量模擬量的控制場合,代替繼電器-接觸器控制在單機或小規(guī)模生產過程中使用。
中型PLC的I/O點數在256~1024之間,功能比較豐富,兼有開關量和模擬量的控制能力,適用于較復雜系統(tǒng)的邏輯控制和閉環(huán)過程的控制。張亮 24小時移動專線:18030028083 QQ:2314094943 傳真:0592-6890859
大型PLC的I/O點數在1024點以上。用于大規(guī)模過程控制,集散式控制和工廠自動化網絡。
2. 按結構形式分類
PLC可分為整體式結構和模塊式結構兩大類。
整體式PLC是將CPU、存儲器、I/O部件等組成部分集中于一體,安裝在印刷電路板上,并連同電源一起裝在一個機殼內,形成一個整體,通常稱為主機或基本單元。整體式結構的PLC具有結構緊湊、體積小、重量輕、價格低的優(yōu)點。一般小型或超小型PLC多采用這種結構。
模塊式PLC是把各個組成部分做成獨立的模塊,如CPU模塊、輸入模塊、輸出模塊、電源模塊等。各模塊作成插件式,并將組裝在一個具有標準尺寸并帶有若干插槽的機架內。模塊式結構的PLC配置靈活,裝配和維修方便,易于擴展。一般大中型的PLC都采用這種結構。
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