&sp;1756-L64
&sp;1756-L64&sp;
1756-L64
PLC分配輸入/輸出點(diǎn)&sp;
一般輸入點(diǎn)和輸入信號(hào)、輸出點(diǎn)和輸出控制是一一對(duì)應(yīng)的。分配好后,按系統(tǒng)配置的通道與
接點(diǎn)號(hào),分配給每一個(gè)輸入信號(hào)和輸出信號(hào),即進(jìn)行編號(hào)。在個(gè)別情況下,也有兩個(gè)信號(hào)用一個(gè)
輸入點(diǎn)的,那樣就應(yīng)在接入輸入點(diǎn)前,按邏輯關(guān)系接好線(如兩個(gè)觸點(diǎn)先串聯(lián)或并聯(lián)),然后再
接到輸入點(diǎn)。&sp;
?。?)確定I/O通道范圍&sp;
不同型號(hào)的PLC,其輸入/輸出通道的范圍是不一樣的,應(yīng)根據(jù)所選PLC型號(hào),查閱相應(yīng)的編程
手冊(cè),決不可“張冠李戴”。須參閱有關(guān)操作手冊(cè)。&sp;
(2)內(nèi)部輔助繼電器&sp;
內(nèi)部輔助繼電器不對(duì)外輸出,不能直接連接外部器件,而是在控制其他繼電器、定時(shí)器/計(jì)數(shù)
器時(shí)作數(shù)據(jù)存儲(chǔ)或數(shù)據(jù)處理用。&sp;
從功能上講,內(nèi)部輔助繼電器相當(dāng)于傳統(tǒng)電控柜中的中間繼電器。未分配模塊的輸入/輸出繼
電器區(qū)以及未使用1:1鏈接時(shí)的鏈接繼電器區(qū)等均可作為內(nèi)部輔助繼電器使用。根據(jù)程序設(shè)計(jì)的
需要,應(yīng)合理安排PLC的內(nèi)部輔助繼電器。
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