251209FANJ

251209FANJ

CIMRE7U4011

A06B-6096-H102

1. 中央處理器

　　中央處理器(CPU)由控制器、運(yùn)算器和寄存器組成并集成在一個(gè)芯片內(nèi)。CPU通過(guò)數(shù)據(jù)總線總線、地址總線、控制總線和電源總線與存儲(chǔ)器、輸入輸出接口、編程器和電源相連接。

　　小型PLC的CPU采用8位或16位微處理器或單片機(jī)，如8031、M68000等，這類芯片價(jià)格很低；中型PLC的CPU采用16位或32位微處理器或單片機(jī)，如8086、96系列單片機(jī)等，這類芯片主要特點(diǎn)是集成度高、運(yùn)算速度快且可靠性高；而大型PLC則需采用高速位片式微處理器。

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公司全稱：
福州卓凱電子科技有限公司
公司地址：
福建省福州市閩侯西江濱大道77號(hào)正榮潤(rùn)園1號(hào)樓1205室

CPU按照PLC內(nèi)系統(tǒng)程序賦予的功能指揮PLC控制系統(tǒng)完成各項(xiàng)工作任務(wù)。

　　2. 存儲(chǔ)器

　　PLC內(nèi)的存儲(chǔ)器主要用于存放系統(tǒng)程序、用戶程序和數(shù)據(jù)等。

　　1)系統(tǒng)程序存儲(chǔ)器

　　PLC系統(tǒng)程序決定了PLC的基本功能，該部分程序由PLC制造廠家編寫并固化在系統(tǒng)程序存儲(chǔ)器中，主要有系統(tǒng)管理程序、用戶指令解釋程序和功能程序與系統(tǒng)程序調(diào)用等部分。

　　系統(tǒng)管理程序主要控制PLC的運(yùn)行，使PLC按正確的次序工作；用戶指令解釋程序?qū)?span>PLC的用戶指令轉(zhuǎn)換為機(jī)器語(yǔ)言指令，傳輸?shù)?span>CPU內(nèi)執(zhí)行；功能程序與系統(tǒng)程序調(diào)用則負(fù)責(zé)調(diào)用不同的功能子程序及其管理程序。

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