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工作速度是指PLC的CPU執(zhí)行指令的速度及對急需處理的輸入信號的響應(yīng)速度。工作速度是PLC工作的基礎(chǔ)。速度高了，才可能通過運行程序?qū)崿F(xiàn)控制，才可能不斷擴大控制規(guī)模，才可能發(fā)揮PLC的多種多樣的作用。
PLC的指令是很多的。不同的PLC。指令的條數(shù)也不同。少的幾十條，多的幾百條。指令不同，執(zhí)行的時間也不同。但各種PLC總有一些基本指令，而且各種的PLC都有這些基本指令，故常以執(zhí)行一條基本指令的時間來衡量這個速度。這個時間當(dāng)然越短越好，已從微秒級縮短到零點微秒級。并隨著微處理器技術(shù)的進(jìn)步，這個時間還在縮短。
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