A06B-0314-B041#7075
A06B-0314-B041#7075
A06B-0314-B041#7075
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繼電器電路圖是一個純粹的硬件電路圖,將它改為plc控制時,需要用plc的外部接線圖和梯形圖來等效繼電器電路圖,其具體方法和步驟如下:
(1)了解和熟悉被控設備的工作原理、工藝過程和機械的動作情況,根據繼電器電路圖分析和掌握控制系統的工作原理。
(2)確定plc的輸人信號和輸出負載。繼電器電路圖中的交流接觸器和電磁閥等執行機構如果用plc的輸出位來控制,它們的線圈在plc的輸出端。按鈕、操作開關和行程開關、接近開關等提供plc的數字量輸人信號繼電器。電路圖中的中間繼電器和時間繼電器的功能用plc內部的存儲器位和定時器來完成,它們與plc的輸人位、輸出位無關。
(3)確定與繼電器電路圖中的中間、時間繼電器對應的梯形圖中的存儲器和定時器、計數器的地址,輸入輸出元件與梯形圖元件的對應關系。
(4)根據上述的對應關系畫出梯形圖。
2.2 梯形圖設計注意事項
根據繼電器電路圖設計plc的外部接線圖和梯形圖時應注意以下問題:(1)應遵守梯形圖語言中的語法規定。由于工作原理不同,梯形圖不能照搬繼電器電路中的某些處理方法。
(2)適當的分離繼電器電路圖中的某些電路。設計繼電器電路圖時的一個基本原則是盡量減少圖中使用的觸點這意味著成本的節約,但是這往往會使某些線圈的控制電路交織在一起。在設計梯形圖時首要的問題是設計的思路要清楚,設計出的梯形圖容易閱讀和理解,并不是特別在意是否多用幾個觸點,因為這不會增加硬件的成本,只是在輸人程序時需要多花一點時間。
(3)盡量減少plc的輸人和輸出點。plc的價格與點數有關,因此輸人、輸出信號的點數是降低硬件費用的主要措施。
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