GE HE693PBS106
采用模塊化結(jié)構(gòu)
為了適應(yīng)各種工業(yè)控制需要，除了單元式的小型PLC以外，絕大多數(shù)PLC均采用模塊化結(jié)構(gòu)。PLC 的各個(gè)部件，包括CPU，電源，I/O 等均采用模塊化設(shè)計(jì)，由機(jī)架及電纜將各模塊連接起來，系統(tǒng)的規(guī)模和功能可根據(jù)用戶的需要自行組合。
編程簡(jiǎn)單易學(xué)
PLC的編程大多采用類似于繼電器控制線路的梯形圖形式，對(duì)使用者來說，不需要具備計(jì)算機(jī)的專門知識(shí)，因此很容易被一般工程技術(shù)人員所理解和掌握。
安裝簡(jiǎn)單，維修方便
PLC不需要專門的機(jī)房，可以在各種工業(yè)環(huán)境下直接運(yùn)行。使用時(shí)只需將現(xiàn)場(chǎng)的各種設(shè)備與PLC相應(yīng)的I/O端相連接，即可投入運(yùn)行。各種模塊上均有運(yùn)行和故障指示裝置，便于用戶了解運(yùn)行情況和查找故障。
由于采用模塊化結(jié)構(gòu)，因此一旦某模塊發(fā)生故障，用戶可以通過更換模塊的方法，使系統(tǒng)迅速恢復(fù)運(yùn)行。
小型PLC
小型PLC的I/O點(diǎn)數(shù)-般在128點(diǎn)以下，其特點(diǎn)是體積小、結(jié)構(gòu)緊湊，整個(gè)硬件融為一體，除了開關(guān)量I/O以外，還可以連接模擬量I/O以及其他各種特殊功能模塊。它能執(zhí)行包括邏輯運(yùn)算、計(jì)時(shí)、計(jì)數(shù)、算術(shù)運(yùn)算、數(shù)據(jù)處理和傳送、通訊聯(lián)網(wǎng)以及各種應(yīng)用指令。
中型PLC
中型PLC采用模塊化結(jié)構(gòu)，其I/0點(diǎn)數(shù)一-般在256~1024點(diǎn)之間。I/O 的處理方式除了采用一.般PLC通用的掃描處理方式外，還能采用直接處理方式，即在掃描用戶程序的過程中，直接讀輸入，刷新輸出。它能聯(lián)接各種特殊功能模塊,通訊聯(lián)網(wǎng)功能更強(qiáng)，指令系統(tǒng)更豐富，內(nèi)存容量更大，掃描速度更快。
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