IC693PIF350 下面分別介紹PLC的各組成部分及其作用，以便用戶進一步了解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調工作，從而實現對現場的各個設備進行控制。CPU由微處理器和控制器組成，它可以實現邏輯運算和數學運算，協調控制系統內部各部分的工作。

控制器的作用是控制整個微處理器的各個部件有條不紊的進行工作，它的基本功能就是從內存中讀取指令和執行指令。

（2）存儲器

PLC配有兩種存儲器，即系統存儲器和用戶存儲器。系統存儲器用來存放系統管理程序，用戶不能訪問和修改這部分存儲器的內容。用戶存儲器用來存放編制的應用程序和工作數據狀態。存放工作數據狀態的用戶存儲器部分也稱為數據存儲區，它包括輸入/輸出數據映像區、定時器/計數器預置數和當前值的數據區及存放中間結果的緩沖區。

IC693PIF350  

Reliance Electric Circuit Board 0-54349 054349 0 54349 

Reliance Electric Company 0-51874 Module 051874 USED

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61241160R Reliance Electric Cable

RELIANCE ELECTRIC 0-57407-4F 0574074F PROCESSOR 

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Reliance Electric GP-2000 AC Drive 1GN026535 25HP 460V 

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Reliance Electric DC Drive Flexpak Plus 14C108-1U 3Hp

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3 HP Reliance Electric AC VS Drive Model 2GU41003

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IC693PIF350