PLC上電后執(zhí)行STIM指令,確定間隔定時(shí)器為重復(fù)中斷模式,間隔定時(shí)器的定時(shí)值為50ms,子程序號(hào)為005。
當(dāng)間隔定時(shí)器達(dá)到設(shè)定時(shí)間50ms時(shí),產(chǎn)生中斷并轉(zhuǎn)去執(zhí)行005號(hào)子程序,同時(shí)定時(shí)器的當(dāng)前值又恢復(fù)為設(shè)定值并重新開始定時(shí)。
再過50 ms時(shí)又產(chǎn)生一次中斷。
次中斷執(zhí)行子程序使20001 ON、20000 OFF,返回去執(zhí)行主程序使01001 ON 50ms、01000 OFF 50ms 。
第二次中斷執(zhí)行子程序時(shí)20000 ON、20001 OFF,所以01000 ON 50ms、01001 OFF 50ms 。
可見該段程序的功能是:
01000和01001均能產(chǎn)生0.1S的脈沖, 直到間隔定時(shí)器停止計(jì)數(shù)為止。
間隔定時(shí)器的定時(shí)時(shí)間*小可達(dá)0.5ms,所以用間隔定時(shí)器可實(shí)現(xiàn)高精度的定時(shí)控制
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