S240-1A8在PLC選型是時(shí)主要是根據(jù)所需功能和容量進(jìn)行選擇,并考慮維護(hù)的方便性,備件的通用性,是否易于擴(kuò)展,有無特殊功能要求等。
PLC輸入/輸出點(diǎn)確定:I/O點(diǎn)數(shù)選擇時(shí)要留出適當(dāng)余量
PLC存儲容量:系統(tǒng)有模擬量信號存在或進(jìn)行大量數(shù)據(jù)處理時(shí)容量應(yīng)選擇大一些;???存儲維持時(shí)間:一般存儲約保持1~3年(與使用次數(shù)有關(guān))。若要長期或掉電保持???應(yīng)選用EEPROM存儲(不需備用電源),也可選外用存儲卡盒;
PLC的擴(kuò)展:可通過增加擴(kuò)展模塊、擴(kuò)展單元與主單元連接的方式。擴(kuò)展模塊有輸入單元、輸出單元、輸入/輸出一體單元。擴(kuò)展部分超出主單元驅(qū)動(dòng)能力時(shí)應(yīng)選用帶電源的擴(kuò)展模塊或另外加電源模塊給以支持;
PLC的聯(lián)網(wǎng):PLC的聯(lián)網(wǎng)方式分為PLC與計(jì)算機(jī)聯(lián)網(wǎng)和PLC之間相互聯(lián)網(wǎng)兩種。與計(jì)算機(jī)聯(lián)網(wǎng)可通過RS232C接口直接連接、RS422+RS232C/422轉(zhuǎn)換適配器連接、調(diào)制解調(diào)通訊連接等方式;一臺計(jì)算機(jī)與多臺PLC聯(lián)網(wǎng),可通過采用通訊處理器、網(wǎng)絡(luò)適配器等方式進(jìn)行連接,連接介質(zhì)為雙絞線或光纜;PLC之間互聯(lián)時(shí)可通過專用通訊電纜直接連接、通訊板卡或模塊+數(shù)據(jù)線連接等方式。
2、充分合理利用軟、硬件資源?
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(gè)任務(wù)時(shí),可先在PLC外部將它們并聯(lián)后再接入一個(gè)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(shí)也減少硬件投入,降低了成本;?
條件允許的情況下最好獨(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(gè)輸出點(diǎn)出現(xiàn)故障時(shí)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(dòng)作;
PLC緊急停止應(yīng)使用外部開關(guān)切斷,以確保安全。???3、使用注意事項(xiàng)???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),接地線裁面不小于2mm2;???輔助電源功率較小,只能帶動(dòng)小功率的設(shè)備(光電傳感器等);
一般PLC均有一定數(shù)量的占有點(diǎn)數(shù)(即空地址接線端子),不要將線接上;
輸出有繼電器型,晶體管型(高速輸出時(shí)宜選用),輸出可直接帶輕負(fù)載(LED指示燈等);
PLC輸出電路中沒有保護(hù),因此應(yīng)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PLC;?輸入、輸出信號線盡量分開走線,不要與動(dòng)力線在同一管路內(nèi)或捆扎在一起,以免出現(xiàn)干擾信號,產(chǎn)生誤動(dòng)作;信號傳輸線采用屏蔽線,并且將屏蔽線接地;為保證信號可靠,輸入、輸出線一般控制在20米以內(nèi);擴(kuò)展電纜易受噪聲電干擾,應(yīng)遠(yuǎn)離動(dòng)力線、高壓設(shè)備等。?
輸入/斷開的時(shí)間要大于PLC掃描時(shí)間;
PLC存在I/O響應(yīng)延遲問題,尤其在快速響應(yīng)設(shè)備中應(yīng)加以注意。
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