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由PLC的工作原理可知,當(dāng)輸入端接動合觸點,在PLC工作時,若輸入端的動合觸點閉合,則對應(yīng)于該輸入端子的輸入繼電器線圈得電,它的動合觸點閉合、動斷觸點斷開;當(dāng)輸入端接動斷觸點且在PLC工作時,若輸入端的動斷觸點未動作,則對應(yīng)于該輸入端的輸入繼電器線圈得電,它的動合觸點閉合、動斷觸點斷開。如果該動斷觸點與輸出繼電器線圈串聯(lián),則輸出繼電器線圈不能得電。因而,用PLC控制電動機的啟停,如果停止按鈕用動斷觸點,則與控制電動機的接觸器相接的PLC輸出繼電器線圈應(yīng)與停止按鈕相接的輸入端子相對應(yīng)的動合觸點串聯(lián)。在繼電接觸控制中,停止按鈕和熱繼電器均用動斷觸點,為了與繼電接觸控制的控制電路相一致,在PLC梯形圖中,同樣也用動斷觸點,這樣一來,與輸入端相接的停止按鈕和熱繼電器觸點就必須用動合觸點。在識讀程序時必須注意這一點。
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卍卍卍 聯(lián)系人:蘇烈格
卍卍卍 企業(yè)QQ:3004859263
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仲鑫達(dá)自動化有大量的工業(yè)電子零部件可供選擇。 新的和停產(chǎn)的。 這些范圍從三十年到技術(shù)。 投資新技術(shù)并不總是必要的。
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Bailey IMRIO02 infi-90
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Yaskawa JAMSC-MB22 11-Slot
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Perceptron 495-0117-03 96K DSP
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Metso Automation NCU2 Circuit Board Module A413016
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MODICON AEG ADU 206 6728-042.274905 Rev. 18 4
New Eaton Dynamatic 15-493-600 Rev. B
Carrier Starter (SMM) CES0121319-01
United Technologies CEAS410754-01-01
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Honeywell 14501876-006
RFL Industries 67B Receiver D-101113 DRB-1 HC95738 D.R
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Delta Tau U MAC 603465-550
Delta Tau UMAC 603465-550
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Baldor Sweodrive 0083752 REV F
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GE Fanuc IC600PA Rack 6 Wide w/PS
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Cognex 560-112098.05
Omron CV500-BI042
Sharp ZW-14PC2
Yokogawa XD16 DC Input XD166N H71007002
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Reliance Electric 0-58707-1
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Bently Nevada 82927-01 79748-01 XDCR I/O
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Moore 15737-116 BDC PCB
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Mettler-Toledo 14849200A
Scragg 46177364 II / 46177363 II w
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Scragg 46177303 / 46177302 w Gated 40668
Cognex 560-112191.05 ICN
Cognex 560-112191.09 ICN
標(biāo)簽:
T814 T814 ICST
T8141可信示范單位 T8141ICS ICST8141
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