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1.存儲(chǔ)容量
存儲(chǔ)容量是指用戶程序存儲(chǔ)器的容量。用戶程序存儲(chǔ)器的容量大，可以編制出復(fù)雜的程序。一般來(lái)說(shuō)，小型PLC的用戶存儲(chǔ)器容量為幾千字，而大型機(jī)的用戶存儲(chǔ)器容量為幾萬(wàn)字。
2.I/O點(diǎn)數(shù)
輸入/輸出(I/O)點(diǎn)數(shù)是PLC可以接受的輸入信號(hào)和輸出信號(hào)的總和，是衡量PLC性能的重要指標(biāo)。I/O點(diǎn)數(shù)越多，外部可接的輸入設(shè)備和輸出設(shè)備就越多，控制規(guī)模就越大。
3.掃描速度
掃描速度是指PLC執(zhí)行用戶程序的速度，是衡量PLC性能的重要指標(biāo)。一般以掃描1K字用戶程序所需的時(shí)間來(lái)衡量掃描速度，通常以ms/K字為單位。PLC用戶手冊(cè)一般給出執(zhí)行各條指令所用的時(shí)間，可以通過(guò)比較各種PLC執(zhí)行相同的操作所用的時(shí)間，來(lái)衡量掃描速度的快慢。
4.指令的功能與數(shù)量
指令功能的強(qiáng)弱、數(shù)量的多少也是衡量PLC性能的重要指標(biāo)。編程指令的功能越強(qiáng)、數(shù)量越多，PLC的處理能力和控制能力也越強(qiáng)，用戶編程也越簡(jiǎn)單和方便，越容易完成復(fù)雜的控制任務(wù)。
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