1771-ASB價格杠杠的1771-ASB價格杠杠的

PLC可編程控制器的分類
    1）按I/O點數分類
    PLC所能接受的輸入信號個數和輸出信號個數分別稱為PLC的輸入點數和 輸出點數。其輸入、輸出點數的數目之和稱為PLC的輸入/輸出點數，簡稱I/O點數。I/O點數是選擇PLC的重要依據之一。
    一般而言，PLC控制系統處理的I/O點數較多時，則控制關系比較復雜，用戶要求的程序存儲器容量也較大，要求PLC指令及其他功能比較多。按PLC輸入、輸出點數的多少可將PLC分為以下三類。
    （1）小型機
    小型PLC輸入、輸出總點數一般在256點以下，用戶程序存儲器容量在4K字左右。小型PLC的功能一般以開關量控制為主，適合單機控制和小型控制系統。
    （2）中型機
    中型PLC的輸入、輸出總點數在256~2048點之間，用戶程序存儲器容量達到8K字左右。中型機適用于組成多機系統和大型控制系統。

鄭娟萍

廈門仲鑫航自動化設備有限公司

(3) 大型機
    大型PLC的輸入、輸出總點數載2084點以上，用戶程序存儲器容量達到16K字以上。大型機適用于組成分布式控制系統和整個工廠的集散控制網絡。
    上述劃分沒有一個十分嚴格的界限，隨著PLC技術的飛速發展，一些小型PLC也具備中型或大型PLC的功能，這也是PLC的發展趨勢。
    2）按結構形式分類
    按照PLC的結構特點可分為整體式、模塊式兩大類。
    （1）整體式結構
    把PLC的CPU、存儲器、輸入/輸出單元、電源等集成在一個基本單元中，其結構經湊，體積小，成本低，安裝方便。基本單元上設有擴展端口，通過電纜與擴展單元相連，可配接特殊功能模塊。微型和小型PLC一般為整體式結構，S7-200系列屬整體式結構。
    （2）模塊式結構
    模塊式結構的PLC由一些模塊單元構成，這些標準模塊包括CPU模塊、輸入模塊、輸出模塊、電源模塊和各種特殊功能模塊等，使用時將這些模塊插在標準機架內即可。各模塊功能是獨立的，外形尺寸是統一的。模塊式PLC的硬件組態方便靈活，裝配和維修方便，易于擴展。
    目前，中、大型PLC多采用模塊式結構形式，如西門子的S7-300和S7-400系列。

NEWPORT ELECTRONICS INFP-0-0-1-2-DC5-9SC4/INFP0012DC9SC4 PROCESS METER***XLNT***

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HONEYWELL NXPANA ALPHA-NUMERIC DISPLAY PANEL ***XLNT***

LUST LTI VF1204S,G10,FB,I6,M3/VF120 4S-G10-FB-I6-M3***XLNT***

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