SAI533-H33

SAI533-H33

SAI533-H33

PLC程序設計步驟。
PLC程序設計一般分為以下幾個步驟：
1. 程序設計前的準備工作
程序設計前的準備工作就是要了解控制系統(tǒng)的全部功能、規(guī)模、控制方式、輸入/輸出信號的種類和數(shù)量、是否有特殊功能的接口、與其它設備的關系、通信的內(nèi)容與方式等，從而對整個控制系統(tǒng)建立一個整體的概念。接著進一步熟悉被控對象，可把控制對象和控制功能按照響應要求、信號用途或控制區(qū)域分類，確定檢測設備和控制設備的物理位置，了解每一個檢測信號和控制信號的形式、功能、規(guī)模及之間的關系。
2. 設計程序框圖
根據(jù)軟件設計規(guī)格書的總體要求和控制系統(tǒng)的具體情況，確定應用程序的基本結構、按程序設計標準繪制出程序結構框圖，然后再根據(jù)工藝要求，繪出各功能單元的功能流程圖。
3. 編寫程序
根據(jù)設計出的框圖逐條地編寫控制程序。編寫過程中要及時給程序加注釋。
4. 程序調(diào)試www.plcs。。ｃｎ
調(diào)試時先從各功能單元入手，設定輸入信號，觀察輸出信號的變化情況。各功能單元調(diào)試完成后，再調(diào)試全部程序，調(diào)試各部分的接口情況，直到滿意為止。程序調(diào)試可以在實驗室進行，也可以在現(xiàn)場進行。如果在現(xiàn)場進行測試，需將可編程控制器系統(tǒng)與現(xiàn)場信號隔離，可以切斷輸入/輸出模板的外部電源，以免引起機械設備動作。程序調(diào)試過程中先發(fā)現(xiàn)錯誤，后進行糾錯?；驹瓌t是“集中發(fā)現(xiàn)錯誤，集中糾正錯誤”。
5. 編寫程序說明書
在說明書中通常對程序的控制要求、程序的結構、流程圖等給以必要的說明，并且給出程序的安裝操作使用步驟等。

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