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IC693CBL303+++IC693CBL303

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而且所有這些編程語(yǔ)言，PCC都采用“符號(hào)變量"來(lái)標(biāo)識(shí)外部I/O通道及內(nèi)部寄存器單元(例如用戶可用motor_run來(lái)代表某開(kāi)關(guān)量輸出通道，button_down代表某開(kāi)關(guān)量輸入通道)。這樣，軟件開(kāi)發(fā)人員毋需熟知PCC內(nèi)部的硬件資源分布，而只須集中精力于項(xiàng)目本身的工藝要求，即可迅速編制出結(jié)構(gòu)清晰功能明確的控制程序來(lái)。

：張亮（工程師）    專線：
24小時(shí)移動(dòng)專線：         【】

    PCC在硬件上的特點(diǎn)，還體現(xiàn)在它為工業(yè)現(xiàn)場(chǎng)的各種信號(hào)和應(yīng)用設(shè)計(jì)了許多的接口模塊和功能模塊，如溫度、張力、步進(jìn)電機(jī)驅(qū)動(dòng)、示波器、鼓序列發(fā)生、脈沖編碼，稱重、超聲波信號(hào)等等。它們將各種形式的現(xiàn)場(chǎng)信號(hào)十分方便的接入以PCC為核心的數(shù)字控制系統(tǒng)中，用戶可按需要對(duì)I/O通道進(jìn)行數(shù)十點(diǎn)、數(shù)百點(diǎn)至數(shù)千點(diǎn)的擴(kuò)展與聯(lián)網(wǎng)。在PCC模塊內(nèi)部，CPU的數(shù)據(jù)總線與IO總線分離，并配置有獨(dú)立的I/O處理器，*的時(shí)間處理單元（TPU）在不增加CPU負(fù)荷的前提下，高速處理無(wú)論簡(jiǎn)單或復(fù)雜的定時(shí)任務(wù)，其基準(zhǔn)計(jì)時(shí)頻率可高達(dá)6.29MHz，因此目前被廣泛應(yīng)用于測(cè)頻測(cè)相及PWM等*精度的時(shí)間處理場(chǎng)合中。而其所有數(shù)字量輸入端都經(jīng)過(guò)了光電耦合隔離，模擬量輸入端也都經(jīng)過(guò)了RC濾波處理，因此具有很好的抗*力，其整體硬件平均*時(shí)間MTBF高達(dá)50萬(wàn)小時(shí)。

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