在FB1、FB2內主要將需要通訊的數(shù)據(jù)分別寫入某數(shù)據(jù)塊如DB10的相應位,由此才能與通訊處理器中的變量取得一致。在FB231中調用兩個STEP5本身提供的標準功能塊FB244(發(fā)送數(shù)據(jù))、FB245(接收數(shù)據(jù)),再根據(jù)通訊處理器填寫一些必要的參數(shù)如接口、作業(yè)號等,從而實現(xiàn)數(shù)據(jù)通訊功能。在FB232內按照通訊處理器分配的數(shù)據(jù)位,定義3臺PLC之間需要傳送的數(shù)據(jù)。在FB4內根據(jù)生產(chǎn)工藝流程要求及操作規(guī)范,充分利用其它功能塊及I/O模塊傳送的數(shù)據(jù),實現(xiàn)系統(tǒng)的自動控制及無擾切換功能;針對多個被控對象相似的特點,分別編制了幾個有代表性的功能塊FB20、FB30、FB40,例如在FB4內多次調用了FB20以便解決PLC內某程序步時間和工控機畫面顯示時間保持一致的問題,而且FB20內又調用了乘法功能塊FB244.FB3根據(jù)FB4發(fā)出的自動程序步指令去控制氣動門、電動門及泵等現(xiàn)場設備。FB10負責所有模擬量的處理,在此調用了開方功能塊FB5.FB11根據(jù)FB10轉換出來的數(shù)據(jù),對模擬量進行報警處理,在此一定要注意模擬量和PLC內部數(shù)字量的對應關系,以保證模擬量顯示和報警的準確性。
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