CX1010-N031
CX1010-N031
不參與控制循環(huán)或在循環(huán)前已經(jīng)投入的指令可不接入PLC;
多重指令控制一個任務(wù)時,宜先在PLC外部將它們并聯(lián)后再接入一個輸入點(diǎn);
盡量利用PLC內(nèi)部功能軟元件,充分調(diào)用中間狀態(tài),使程序具有完整連貫性,易于開發(fā)。同時也減少硬件投入,降低了成本;
條件允許的情況下宜獨(dú)立每一路輸出,便于控制和檢查,也保護(hù)其它輸出回路;當(dāng)一個輸出點(diǎn)出現(xiàn)故障時只會導(dǎo)致相應(yīng)輸出回路失控;
輸出若為正/反向控制的負(fù)載,不僅要從PLC內(nèi)部程序上聯(lián)鎖,并且要在PLC外部采取措施,防止負(fù)載在兩方向動作;
PLC緊急停止宜使用外部開關(guān)切斷,以確保。
9.其他注意事項
不要將交流電源線接到輸入端子上,以免燒壞PLC;
接地端子應(yīng)獨(dú)立接地,不與其它設(shè)備接地端串聯(lián),接地線截面積不小于2mm2;
輔助電源功率較小,只能帶動小功率的設(shè)備(光電傳感器等);
一些PLC有數(shù)量的占有點(diǎn)數(shù)(即空地址接線端子),不要將線接上;
當(dāng)PLC輸出電路中沒有保護(hù)時,宜在外部電路中串聯(lián)使用熔斷器等保護(hù)裝置,防止負(fù)載短路造成損壞。
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