IC693PIF350 下面分別介紹PLC的各組成部分及其作用，以便用戶進(jìn)一步了解PLC的控制原理和工作過程。

（1）CPU

CPU是PLC的控制中樞，PLC在CPU的控制下有條不紊地協(xié)調(diào)工作，從而實(shí)現(xiàn)對(duì)現(xiàn)場(chǎng)的各個(gè)設(shè)備進(jìn)行控制。CPU由微處理器和控制器組成，它可以實(shí)現(xiàn)邏輯運(yùn)算和數(shù)學(xué)運(yùn)算，協(xié)調(diào)控制系統(tǒng)內(nèi)部各部分的工作。

控制器的作用是控制整個(gè)微處理器的各個(gè)部件有條不紊的進(jìn)行工作，它的基本功能就是從內(nèi)存中讀取指令和執(zhí)行指令。

（2）存儲(chǔ)器

PLC配有兩種存儲(chǔ)器，即系統(tǒng)存儲(chǔ)器和用戶存儲(chǔ)器。系統(tǒng)存儲(chǔ)器用來存放系統(tǒng)管理程序，用戶不能訪問和修改這部分存儲(chǔ)器的內(nèi)容。用戶存儲(chǔ)器用來存放編制的應(yīng)用程序和工作數(shù)據(jù)狀態(tài)。存放工作數(shù)據(jù)狀態(tài)的用戶存儲(chǔ)器部分也稱為數(shù)據(jù)存儲(chǔ)區(qū)，它包括輸入/輸出數(shù)據(jù)映像區(qū)、定時(shí)器/計(jì)數(shù)器預(yù)置數(shù)和當(dāng)前值的數(shù)據(jù)區(qū)及存放中間結(jié)果的緩沖區(qū)。

IC693PIF350  

Reliance Electric Circuit Board 0-54349 054349 0 54349 

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61241160R Reliance Electric Cable

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IC693PIF350