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根據(jù)PLC所具有的功能不同，可將PLC分為低檔、中檔、三類。
????（1）低檔PLC ?具有邏輯運算、定時、計數(shù)、移位以及自診斷、監(jiān)控等基本功能，還可有少量模擬量輸入／輸出、算術(shù)運算、數(shù)據(jù)傳送和比較、通信等功能。主要用于邏輯控制、順序控制或少量模擬量控制的單機控制系統(tǒng)。
????（2）中檔PLC???除具有低檔PLC的功能外，還具有較強的模擬量輸入／輸出、算術(shù)運算、數(shù)據(jù)傳送和比較、數(shù)制轉(zhuǎn)換、遠程I/O、子程序、通信聯(lián)網(wǎng)等功能。有些還可增設(shè)中斷控制、PID控制等功能，適用于復(fù)雜控制系統(tǒng)。
????（3）PLC???除具有中檔機的功能外，還增加了帶符號算術(shù)運算、矩陣運算、位邏輯運算、平方根運算及其它特殊功能函數(shù)的運算、制表及表格傳送功能等。PLC機具有更強的通信聯(lián)網(wǎng)功能，可用于大規(guī)模過程控制或構(gòu)成分布式網(wǎng)絡(luò)控制系統(tǒng)，實現(xiàn)工廠自動化。
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Keithley 7036-MTC-2 Mass Terminated Cable Assembly for 7036 Relay Cards 96-Pin
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?Lot of 2 New Sloan F5A CP Royal Spud Coupling Assembly 1 1/4" x 3" Chrome Finish
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?Lot of 3 New Sloan F5AW Flushometer Spud Coupling & Flange Kit for 3/4" Urinal
?New Telemecanique LT2-SA 00B Thermal Trip Protection Relay 24VAC
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?Idec AVLW49902D-R-24V E-Stop Pushbutton 110-600VAC 120-600VDC 10A 1NO 2NC
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?Telemecanique LC1 D2510 Contactor 3-Pole + N.O Aux Rated @ 40A 1000V, 120V Coil
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?New ACE MC75-3 Miniature Shock Absorber 75in-lbs/cycle 0.4" Stroke 1/2-20 Thread
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?Flex Cable FC-CFBM6DF-CBAF-M003 Feedback Cable, 28-Pin to Flying Leads, 3m Long
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