在FB1、FB2內(nèi)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(yīng)位,由此才能與通訊處理器中的變量取得一致。在FB231中調(diào)用兩個STEP5本身提供的標(biāo)準(zhǔn)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(shí)現(xiàn)數(shù)據(jù)通訊功能。在FB232內(nèi)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(nèi)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(shí)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(diǎn),分別編制了幾個有代表性的功能塊FB20、FB30、FB40,例如在FB4內(nèi)多次調(diào)用了FB20以便解決PLC內(nèi)某程序步時間和工控機(jī)畫面顯示時間保持一致的問題,而且FB20內(nèi)又調(diào)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(shè)備。FB10負(fù)責(zé)所有模擬量的處理,在此調(diào)用了開方功能塊FB5.FB11根據(jù)FB10轉(zhuǎn)換出來的數(shù)據(jù),對模擬量進(jìn)行報警處理,在此一定要注意模擬量和PLC內(nèi)部數(shù)字量的對應(yīng)關(guān)系,以保證模擬量顯示和報警的準(zhǔn)確性。
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