140DDI35310 Schneider140DDI35310 Schneider
PLC控制系統(tǒng)設計步驟可用流程圖來表示。這種設計方法與傳統(tǒng)的繼電器——接觸器控制系統(tǒng)的設計相比較，組件的選擇代替了原來的器件選擇，程序設計代替了原來的邏輯電路設計。
（1）根據工藝流程分析控制要求，明確控制任務，擬定控制系統(tǒng)設計的技術條件。技術條件一般以設計任務書的形式來確定，它是整個設計的依據。工藝流程的特點和要求是開發(fā)PLC控制系統(tǒng)的主要依據，所以必須詳細分析、認真研究，從而明確控制任務和范圍。如需要完成的動作（動作時順、動作條件，相關的保護和聯鎖等）和應具備的操作方式（手動、自動、連續(xù)、單周期，單步等）。
（2）確定所需的用戶輸入設備（按鈕、操作開關、限位開關、傳感器等）、輸出設備（繼電器、接觸器、信號燈等執(zhí)行元件）以及由輸出設備驅動的控制對象（電動機、電磁閥等），估算PLC的I/O點數；分析控制對象與PLC之間的信號關系，信號性質，根據控制要求的復雜程度，控制精度估算PLC的用戶存儲器容量。
（3）選擇PLC。PLC是控制系統(tǒng)的核心部件，正確選擇PLC對于保證整個控制系統(tǒng)的各項技術、經濟指標起著重要的作用，PLC的選擇包括機型的選擇、容量的選擇、I/O模塊的選擇、電源模塊的選擇等。選擇PLC的依據是輸入輸出形式與點數，控制方式與速度、控制精度與分辨率，用戶程序容量。
鄭娟萍
廈門仲鑫航自動化設備有限公司
（4）分配、定義PLC的I/O點，繪制I/O連接圖。根據選用的PLC所給定的元件地址范圍（如輸入、輸出、輔助繼電器、定時器、計數器。數據區(qū)等），對控制系統(tǒng)使用的每一個輸入、輸出信號及內部元件定義的信號名和地址，在程序設計中使用哪些內部元件，執(zhí)行什么功能格都要做到清晰，無誤。
（5）PLC控制程序設計。包括設計梯形圖、編寫語句表、繪制控制系統(tǒng)流程圖。控制程序是控制整個系統(tǒng)工作的軟件，是保證系統(tǒng)工作正常，安全。可靠的關鍵，因此，控制程序的設計必須經過反復測試。修改，直到滿足要求為止。
（6）控制柜（臺）設計和現場施工。在進行控制程序設計的同時，可進行硬件配備工作，主要包括強電設備的安裝、控制柜（臺）的設計與制作、可編程序控制器的安裝、輸入輸出的連接等。在設計繼電器控制系統(tǒng)時，必須在控制線路設計完成后，才能進行控制柜（臺）設計和現場施工。可見，采用PLC控制系統(tǒng)，可以使軟件設計與硬件配備工作平行進行，縮短工程周期。如果需要的話，尚需設計操作臺、電氣柜、模擬顯示盤和非標準電器元部件。
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