IC200ALG326
IC200ALG326
IC200ALG326
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PLC的控制方式屬於存儲程序控制,其控制功能是通過存放在存儲器內的程序來實現的,若要對控制功能作必要修改,只需改變控制程序即可,這就實現了控制的軟件化。可編程控制器的優點在於"可"字,從軟件來講,其控制程序可編輯、可修改;從硬件上講,其外部設備配置可變。構建一個PLC控制係統的重心就在於控制程序的編制,但外部設備的選用也將對程序的編制產生影響。因此在進行程序設計時應結合實際需要,硬、軟件綜合考慮。本文就硬、軟兩方面,選取梯形圖為編程語言,以松下電工FPO-C32型PLC為例,對PLC使用過程中易出現的幾個問題及解決方法進行了分析。
一、外部輸入設備的選用與PLC輸入繼電器的使用
1. 外部輸入信號的採集
PLC的外部設備主要是指控制係統中的輸入輸出設備,其中輸人設備是對係統發出各種控制信號的主令電器,在編寫控制程序時注意外部輸入設備使用的是常開還是常閉觸點,並以此為基礎進行程序編制。否則易出現控制錯誤。
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