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PLC控制系統(tǒng)與電器控制系統(tǒng)相比，有許多相似之處，也有許多不同。不同之處主要在以下幾個(gè)方面：
1)從控制方法上看，電器控制系統(tǒng)控制邏輯采用硬件接線，利用繼電器機(jī)械觸點(diǎn)的串聯(lián)或并聯(lián)等組合成控制邏輯，其連線多且復(fù)雜、體積大、功耗大，系統(tǒng)構(gòu)成后，想再改變或增加功能較為困難。另外，繼電器的觸點(diǎn)數(shù)量有限，所以電器控制系統(tǒng)的靈活性和可擴(kuò)展性受到很大限制。而PLC采用了計(jì)算機(jī)技術(shù)，其控制邏輯是以程序的方式存放在存儲器中，要改變控制邏輯只需改變程序，因而很容易改變或增加系統(tǒng)功能。系統(tǒng)連線少、體積小、功耗小，而且PLC所謂“軟繼電器”實(shí)質(zhì)上是存儲器單元的狀態(tài)，所以“軟繼電器”的觸點(diǎn)數(shù)量是的，PLC系統(tǒng)的靈活性和可擴(kuò)展性好。
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廈門莫格電氣自動(dòng)化有限公司
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2)從工作方式上看，在繼電器控制電路中，當(dāng)電源接通時(shí)，電路中所有繼電器都處于受制約狀態(tài)，即該吸合的繼電器都同時(shí)吸合，不該吸合的繼電器受某種條件限制而不能吸合，這種工作方式稱為并行工作方式。而PLC的用戶程序是按一定順序循環(huán)執(zhí)行，所以各軟繼電器都處于周期性循環(huán)掃描接通中，受同一條件制約的各個(gè)繼電器的動(dòng)作次序決定于程序掃描順序，這種工作方式稱為串行工作方式。
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INGERSOLL-RAND 105LBS LIFTING DEVICE ASSEMBLY *NEW*
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KNIGHT ONE BUTTON ELECTRICAL CONTROL HANDLE, EPA9201-4P
BUHLER .20MM BLOW-THROUGH AIRLOCK MPSH-22/22LP TK1, CRACKED
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WHX 4885 RIV CHAIN, 12" PITCH, ROLLER 1.75" DIA. 3.25"W, PLATE 2.5"H, LISTING #2
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MARTIN CONVENTIONAL QD SHEAVE 5 C 240 F
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BLACK & DECKER 120VAC/DC 18.0A 900/350RPM TWO SPEED SUPER POWER UNIT 748 TYPE B
REVVO HEAVYDUTY STEEL CASTERS TFH125 NNB
YALE * 6-TON CHAIN HOIST * NO LABEL
INGERSOLL-RAND IRAX 30-40KG 66-88LBS. CAPACITY SPRING BALANCER BSD 40
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