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PLC品種齊全的各種硬件裝置，可以組成能滿足各種要求的控制系統(tǒng)，用戶不必自己再設(shè)計(jì)和制作硬件裝置。用戶在硬件確定以后，在生產(chǎn)工藝流程改變或生產(chǎn)設(shè)備更新的情況下，不必改變PLC的硬設(shè)備，只需改編程序就可以滿足要求。因此，PLC除應(yīng)用于單機(jī)控制外，在工廠自動(dòng)化中也被大量采用。

高可靠性是電氣控制設(shè)備的關(guān)鍵性能。PLC由于采用現(xiàn)代大規(guī)模集成電路技術(shù)，采用嚴(yán)格的生產(chǎn)工藝制造，內(nèi)部電路采取了先進(jìn)的抗干擾技術(shù)，具有很高的可靠性。使用PLC構(gòu)成控制系統(tǒng)，和同等規(guī)模的繼電接觸器系統(tǒng)相比，電氣接線及開關(guān)接點(diǎn)已減少到數(shù)百甚至數(shù)千分之一，故障也就大大降低。此外，PLC帶有硬件故障自我檢測(cè)功能，出現(xiàn)故障時(shí)可及時(shí)發(fā)出警報(bào)信息。在應(yīng)用軟件中，應(yīng)用者還可以編入外圍器件的故障自診斷程序，使系統(tǒng)中除PLC以外的電路及設(shè)備也獲得故障自診斷保護(hù)。這樣，整個(gè)系統(tǒng)將極高的可靠性。

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Markem 9840 Ink Jet Control 115/230V-AC, 125/250V-AC, 350W

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Martin 20 60 B30 Sprocket Bore: 1.12" OD: 6.95" (Approximate) 30 Teeth

Martin 50BS20 1-1/8 Bore Sproket  In Box

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Martin Coupling Shaft Tail 19.5"L x 3 1/4" Dia

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Martin D60BTB20H 2517 Double Roller Sprocket

Martin High Torque Sprocket P32-8M-50 Max RPM 7930 32 Teeth

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