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控制規(guī)模還與內(nèi)存區(qū)的大小有關(guān)。規(guī)模大，用戶程序長(zhǎng)，要求有更大的用戶存儲(chǔ)區(qū)。同時(shí)點(diǎn)數(shù)多，系統(tǒng)的存儲(chǔ)器輸入、輸出的信號(hào)區(qū)（輸入輸出繼電器區(qū)或稱輸入、輸出映射區(qū)）也大。這個(gè)區(qū)大，相應(yīng)地內(nèi)部器件（解釋見后）也要增多，這些都要求有更大的系統(tǒng)存儲(chǔ)區(qū)。

控制規(guī)模還與輸入、輸出電路數(shù)有關(guān)。如控制規(guī)模為1024點(diǎn)，那就得有1024條I/O電路。這些電路集成于I/O模塊中，而每個(gè)模塊有多少路的I/O點(diǎn)總是有數(shù)的。所以，規(guī)模大，所使用的模塊也多。

控制規(guī)模還與PLC指令系統(tǒng)有關(guān)。規(guī)模大的PLC指令條數(shù)多，指令的功能也強(qiáng)，才能應(yīng)付對(duì)點(diǎn)數(shù)多的系統(tǒng)進(jìn)行控制的需要。

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廈門莫格電氣自動(dòng)化有限公司
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