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醫(yī)生憤怒地訓(xùn)斥自己的助手：“我明明讓你給病人喝的是止咳藥，可你竟然給他喝了一瓶瀉藥！”
助手辯解：“他不是不咳嗽了嗎？”
醫(yī)生無(wú)奈地說(shuō)：“他實(shí)在是不敢咳嗽了！”
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PLC脈沖頻率功能是讀取高速計(jì)數(shù)器輸入的脈沖頻率，將其轉(zhuǎn)換為旋轉(zhuǎn)速度，或者將計(jì)數(shù)器當(dāng)前值轉(zhuǎn)換為累計(jì)轉(zhuǎn)數(shù)，它將轉(zhuǎn)換值十六進(jìn)制8位輸出，并且僅可在高速計(jì)數(shù)器0中使用。進(jìn)行頻率-旋轉(zhuǎn)速度的轉(zhuǎn)換時(shí)．利用高速計(jì)數(shù)器輸入的脈沖頻率及每1圈的脈沖數(shù)計(jì)算出旋轉(zhuǎn)速度。進(jìn)行計(jì)數(shù)器當(dāng)前值-累計(jì)轉(zhuǎn)數(shù)的轉(zhuǎn)換時(shí)，利用計(jì)數(shù)器當(dāng)前值及每1圈的脈沖數(shù)計(jì)算出累計(jì)轉(zhuǎn)數(shù)。其具體的使用步驟如下所述。
(1)高速計(jì)數(shù)器的使用/不使用的設(shè)定：將PLC系統(tǒng)設(shè)定的【高速計(jì)數(shù)器0使用/不使用】設(shè)定為“使用”。
(2)計(jì)數(shù)器模式的選擇：選擇PLC系統(tǒng)設(shè)定中的【高速計(jì)數(shù)器O】/【計(jì)數(shù)模式】。
(3)數(shù)值范圍模式的選擇：選擇PLC系統(tǒng)設(shè)定【高速計(jì)數(shù)器O】/【數(shù)值范圍模式】。在數(shù)值范圍模式設(shè)為環(huán)形模式的情況下，設(shè)定PLC系統(tǒng)設(shè)定【高速計(jì)數(shù)器0】/【環(huán)形計(jì)數(shù)器最大值】。
(4)高速計(jì)數(shù)器當(dāng)前值的復(fù)位方式選擇：選擇PLC系統(tǒng)設(shè)定【高速計(jì)數(shù)器O】/【復(fù)位方式】。
(5)PRV2指令的執(zhí)行：在頻率數(shù)轉(zhuǎn)換為轉(zhuǎn)數(shù)的情況下，操作數(shù)C1是控制數(shù)據(jù)【頻率-旋轉(zhuǎn)速度的轉(zhuǎn)換：#0000】；操作數(shù)C2是系統(tǒng)設(shè)定【每1圈的脈沖數(shù)(Hα)】；操作數(shù)D是轉(zhuǎn)換結(jié)果保存目的地低位CH編號(hào)。在將計(jì)數(shù)器當(dāng)前值轉(zhuǎn)換為轉(zhuǎn)數(shù)的情況下，操作數(shù)C1是控制數(shù)據(jù)【計(jì)數(shù)器當(dāng)前值-累計(jì)轉(zhuǎn)數(shù)的轉(zhuǎn)換：#0001】；操作數(shù)C2是系數(shù)設(shè)定【每1圈的脈沖數(shù)(Hα)】；操作數(shù)D是轉(zhuǎn)換結(jié)果保存目的地低位CH編號(hào)。