SAI533-H33
SAI533-H33
PLC程序設(shè)計(jì)步驟。
PLC程序設(shè)計(jì)一般分為以下幾個(gè)步驟:
1. 程序設(shè)計(jì)前的準(zhǔn)備工作
程序設(shè)計(jì)前的準(zhǔn)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(hào)的種類(lèi)和數(shù)量、是否有特殊功能的接口、與其它設(shè)備的關(guān)系、通信的內(nèi)容與方式等,從而對(duì)整個(gè)控制系統(tǒng)建立一個(gè)整體的概念。接著進(jìn)一步熟悉被控對(duì)象,可把控制對(duì)象和控制功能按照響應(yīng)要求、信號(hào)用途或控制區(qū)域分類(lèi),確定檢測(cè)設(shè)備和控制設(shè)備的物理位置,了解每一個(gè)檢測(cè)信號(hào)和控制信號(hào)的形式、功能、規(guī)模及之間的關(guān)系。
2. 設(shè)計(jì)程序框圖
根據(jù)軟件設(shè)計(jì)規(guī)格書(shū)的總體要求和控制系統(tǒng)的具體情況,確定應(yīng)用程序的基本結(jié)構(gòu)、按程序設(shè)計(jì)標(biāo)準(zhǔn)繪制出程序結(jié)構(gòu)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(xiě)程序
根據(jù)設(shè)計(jì)出的框圖逐條地編寫(xiě)控制程序。編寫(xiě)過(guò)程中要及時(shí)給程序加注釋。
4. 程序調(diào)試www.plcs。。cn
調(diào)試時(shí)先從各功能單元入手,設(shè)定輸入信號(hào),觀察輸出信號(hào)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(shí)驗(yàn)室進(jìn)行,也可以在現(xiàn)場(chǎng)進(jìn)行。如果在現(xiàn)場(chǎng)進(jìn)行測(cè)試,需將可編程控制器系統(tǒng)與現(xiàn)場(chǎng)信號(hào)隔離,可以切斷輸入/輸出模板的外部電源,以免引起機(jī)械設(shè)備動(dòng)作。程序調(diào)試過(guò)程中先發(fā)現(xiàn)錯(cuò)誤,后進(jìn)行糾錯(cuò)。基本原則是“集中發(fā)現(xiàn)錯(cuò)誤,集中糾正錯(cuò)誤”。
5. 編寫(xiě)程序說(shuō)明書(shū)
在說(shuō)明書(shū)中通常對(duì)程序的控制要求、程序的結(jié)構(gòu)、流程圖等給以必要的說(shuō)明,并且給出程序的安裝操作使用步驟等。
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