PLC脈沖頻率功能是讀取高速計數(shù)器輸入的脈沖頻率，將其轉(zhuǎn)換為旋轉(zhuǎn)速度，或者將計數(shù)器當(dāng)前值轉(zhuǎn)換為累計轉(zhuǎn)數(shù)，它將轉(zhuǎn)換值十六進制8位輸出，并且僅可在高速計數(shù)器0中使用。進行頻率-旋轉(zhuǎn)速度的轉(zhuǎn)換時．利用高速計數(shù)器輸入的脈沖頻率及每1圈的脈沖數(shù)計算出旋轉(zhuǎn)速度。進行計數(shù)器當(dāng)前值-累計轉(zhuǎn)數(shù)的轉(zhuǎn)換時，利用計數(shù)器當(dāng)前值及每1圈的脈沖數(shù)計算出累計轉(zhuǎn)數(shù)。其具體的使用步驟如下所述。

      (1)高速計數(shù)器的使用/不使用的設(shè)定：將PLC系統(tǒng)設(shè)定的【高速計數(shù)器0使用/不使用】設(shè)定為“使用”。

      (2)計數(shù)器模式的選擇：選擇PLC系統(tǒng)設(shè)定中的【高速計數(shù)器O】/【計數(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【高速計數(shù)器0】/【環(huán)形計數(shù)器大值】。

      (4)高速計數(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。在將計數(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)【計數(shù)器當(dāng)前值-累計轉(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。 

1. 圖解法編程 

圖解法是靠畫圖進行PLC程序設(shè)計。常見的主要有梯形圖法、邏輯流程圖法、時序流程圖法和步進順控法。

(1) 梯形圖法：梯形圖法是用梯形圖語言去編制 PLC程序。這是一種模仿繼電器控制系統(tǒng)的編程方法。其圖形甚至元件名稱都與繼電器控制電路十分相近。這種方法很容易地就可以把原繼電器控制電路移植成 PLC的梯形圖語言。這對于熟悉繼電器控制的人來說，是方便的一種編程方法。

(2) 邏輯流程圖法：邏輯流程圖法是用邏輯框圖表示 PLC程序的執(zhí)行過程，反應(yīng)輸入與輸出的關(guān)系。邏輯流程圖法是把系統(tǒng)的工藝流程，用邏輯框圖表示出來形成系統(tǒng)的邏輯流程圖。這種方法編制的 PLC 控制程序邏輯思路清晰、輸入與輸出的因果關(guān)系及聯(lián)鎖條件明確。邏輯流程圖會使整個程序脈絡(luò)清楚，便于分析控制程序，便于查找故障點，便于調(diào)試程序和維修程序。有時對一個復(fù)雜的程序，直接用語句表和用梯形圖編程可能覺得難以下手，則可以先畫出邏輯流程圖，再為邏輯流程圖的各個部分用語句表和梯形圖編制PLC應(yīng)用程序。

(3) 時序流程圖法：時序流程圖法使首先畫出控制系統(tǒng)的時序圖（即到某一個時間應(yīng)該進行哪項控制的控制時序圖），再根據(jù)時序關(guān)系畫出對應(yīng)的控制任務(wù)的程序框圖，后把程序框圖寫成 PLC程序。時序流程圖法很適合于以時間為基準的控制系統(tǒng)的編程方法。

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