6FX1122-2AB01---6FX1122-2AB01
6FX1122-2AB01---6FX1122-2AB016FX1122-2AB01---6FX1122-2AB01
在PLC程序設計完成后,為了保證程序的可靠性,通常需要對編制的程序進行一次語法、格式的全面檢查。檢查應包括如下基本內(nèi)容:
①程序中一般不應有重復線圈(特殊使用除外);
②程序中一般不應出現(xiàn)只有觸點、沒有輸出的信號:
③如果程序中使用了符號地址,一般不應有未定義符號的變量;
④程序中一般不應有未編程的輸出點:
⑤程序中一般不應有未使用的輸入點:
⑥程序中一般不應有未調(diào)用的邏輯塊。
同時,為了程序調(diào)試與檢查的需要,有時還應統(tǒng)計系統(tǒng)中I/O點的使用位置,特別是線圈的賦值程序段,以便程序的修改與檢查。
在西門子STEP7中,以上內(nèi)容均可以通過對所謂“參考數(shù)據(jù)(Reference Data)”的顯示,進行專門的統(tǒng)計、歸納與匯總。
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