在一個(gè)每次掃描都不調(diào)用的程序塊中使用OFDT,除非定時(shí)器復(fù)位，不然在程序塊內(nèi)的定時(shí)器計(jì)時(shí)。這意味著OFDT功能塊象–個(gè)比主程序塊中定時(shí)器掃描更慢的定時(shí)器一樣運(yùn)行。對(duì)那些長(zhǎng)時(shí)間的非活動(dòng)的程序塊，對(duì)OFDT編程時(shí)應(yīng)該考慮到這種追趕特性。

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Omron Temperature Controller E5C4-R40J, 50/60 Hz, 3 Amp

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Hubbell Watertight Receptacle 460R7W #36030

Legacy Grease Filler Pump and Guide L3065 #20470

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Sharp JW-10PG Hand Held Programmer #23258

Warner Swasey 8100-0059 A Circuit Board #23242

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Allen Bradley 16 Slot I/O Chassis 1771-A4B #29095

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Numatics Valve 3SAD4O #13432

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