1756-CNB/D
1756-CNB/D
有的內部繼電器還可丟電保持,即它的狀態(ON或OFF)、PLC丟電后,靠內部電池仍予以保持。再上電后可繼續丟電前的狀態。保持繼電器可增強PLC控制能力,特別對記錄故障,故障排除后恢復運行,更顯得有用。
定時器,可進行定時控制。定時值可任意設定。定時器有多少,設定范圍有多大,設定值的分辨率又是多少,這些都代表定時器件的性能。
計數器,可進行計數,到達某設定計數值可發送相應信號。可進行什么樣的計數,計數范圍多大,怎么設定,有多少計數器,則是PLC計數器性能的代表指標。
現貨,現貨,降降降,火火火,火火火……
現貨,現貨,降降降,火火火,火火火……
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