A06B-6114-H303

A06B-6114-H303

外部設(shè)備已開展變成PLC體系的不行分割的一個有些。它的狀況，當(dāng)然是選用PLC有必要了解的首要方面，所以也應(yīng)把它列為PLC功用的首要內(nèi)容。
5.4內(nèi)存容量
PLC內(nèi)存有用戶及體系兩大大都。用戶內(nèi)存首要用以存儲用戶程序，單個的還將其間的一有些劃為體系所用。體系內(nèi)存是與CPU裝備在一起的。CPU既要具有拜訪這些內(nèi)存的才干，還應(yīng)供給相應(yīng)的存儲介質(zhì)。
用戶內(nèi)存巨細與可存儲的用戶程序量有關(guān)。內(nèi)存大，可存儲的程序量大，也就可進行更為雜亂的操控。從開展趨勢看，內(nèi)存容量老是在不斷增大著。大型PLC的內(nèi)存容量可達幾十k，以致于一百多k。體系內(nèi)存關(guān)于用戶，首要體如今PLC能供給多少內(nèi)部器材。不一樣的內(nèi)部器材占有體系內(nèi)存的不一樣區(qū)域。在物理上并無這些器材，僅僅為RAM。但經(jīng)過運轉(zhuǎn)程序進行運用時，給運用者供給的卻實實在在有這些器材。
內(nèi)存器材品種越多，數(shù)量越多，越便于PLC進行各種邏輯量及模仿操控。它也是代表
PLC功用的首要方針。
PLC內(nèi)部器材有：
I/O繼電器，或稱映射區(qū)。它與PLC所能操控的I/O點數(shù)及模仿量的路數(shù)直接有關(guān)。
內(nèi)部繼電器數(shù)，有的稱為象征位數(shù)，代表著PLC的內(nèi)部繼電器數(shù)。它與I/O繼電器區(qū)相聯(lián)絡(luò)著，有時與后者相聯(lián)絡(luò)進行處理。內(nèi)部繼電器多，便于PLC樹立雜亂的時序聯(lián)絡(luò)，以完結(jié)多種多樣的操控請求。通常講，內(nèi)部繼電器數(shù)比I/O繼電器要多得多。
有的內(nèi)部繼電器還可丟電堅持，即它的狀況（ON或OFF）、PLC丟電后，靠內(nèi)部電池仍予以堅持。再上電后可持續(xù)丟電前的狀況。堅持繼電器可增強PLC操控才干，特別對記載毛病，毛病掃除后康復(fù)運轉(zhuǎn)，更顯得有用。

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