點(diǎn)擊圖片查看大圖1746-OX8產(chǎn)品描述：
1746-OX8
公司聯(lián)絡(luò)人：嚴(yán)小姐
Tel：0592-5709823
Phone：18030229052
商務(wù)QQ：1093230189
1762-L24BWA有一個(gè)高速計(jì)數(shù)器，因此，有一個(gè)功能文件，設(shè)置如下[2]： AS=1 Auto start 自動(dòng)啟動(dòng) CE=1 Counting Enabled 允許計(jì)數(shù) M0=0 Mode Done 模式選擇 CU=1 Counp Up 增計(jì)數(shù) HIP=32700 High preset 上限 OVF=32700 Overflow 溢出 （變頻器輸出0-50Hz時(shí)，Y2輸出0-10000Hz,小于32767，HIP=32760，所以不會(huì)溢出） 特別需要注意，正確設(shè)置PLC高速計(jì)數(shù)端口的濾波時(shí)間，否則計(jì)數(shù)將會(huì)失敗。 PLC I/O配置 Input Filter Input 0+1 25微秒 Input 2+3 25微秒 圖2是計(jì)數(shù)程序，圖3是計(jì)數(shù)波形。 頻率計(jì)算的方法是：計(jì)數(shù)器HSC：0在1秒時(shí)間內(nèi)累計(jì)進(jìn)入IN0的脈沖數(shù)目，除200后所得結(jié)果F8：0即為變頻器輸出頻率。在正常計(jì)數(shù)時(shí)，PLC 端口IN0的 LED燈會(huì)快速閃動(dòng)。測(cè)量誤差取決于EV1000參數(shù)F7.32和計(jì)時(shí)器T4：1的時(shí)基。本例，大誤差為±0.5Hz. [align=center]
圖2 梯形圖程序 
圖3 波形圖[/align] 小結(jié)：不同品牌的PLC應(yīng)用程序大同小異，但基本思路是一樣的，本方法在小型PLC應(yīng)用中具有實(shí)際意義，當(dāng)模擬量端口緊缺的時(shí)候，尤為實(shí)用。注意EV2000變頻器的Y2只能選擇0-19，可用D0代之。
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