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霍尼韋爾FF-SRS59252
霍尼韋爾FF-SRS59252
霍尼韋爾FF-SRS59252
在繼電器控制線路中，當(dāng)電源接通時，線路中各繼電器都處于受制約狀態(tài)，該合的合，該斷的斷。而在PLC的梯形圖中，各“軟繼電器”都處于周期性循環(huán)掃描接通中，從客觀上看，每個“軟繼電器”受條件制約，接通時間是短暫的。也就是說繼電器在控制的工作方式是并行的，而PLC的工作方式是串行的。
（圖片只做參考，不代表實物圖，價格和具體內(nèi)容請電詢，感謝您的配合）
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