廈門卡庫電氣有限公司(廈門辦）

1746-OX8產(chǎn)品描述：

1746-OX8

公司聯(lián)絡(luò)人：嚴小姐

Tel：0592-5709823

Phone：18030229052

商務QQ：1093230189
1762-L24BWA有一個高速計數(shù)器，因此，有一個功能文件，設(shè)置如下[2]： AS=1 Auto start 自動啟動 CE=1 Counting Enabled 允許計數(shù) M0=0 Mode Done 模式選擇 CU=1 Counp Up 增計數(shù) HIP=32700 High preset 上限 OVF=32700 Overflow 溢出 （變頻器輸出0-50Hz時，Y2輸出0-10000Hz,小于32767，HIP=32760，所以不會溢出） 特別需要注意，正確設(shè)置PLC高速計數(shù)端口的濾波時間，否則計數(shù)將會失敗。 PLC I/O配置 Input Filter Input 0+1 25微秒 Input 2+3 25微秒 圖2是計數(shù)程序，圖3是計數(shù)波形。 頻率計算的方法是：計數(shù)器HSC：0在1秒時間內(nèi)累計進入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。在正常計數(shù)時，PLC 端口IN0的 LED燈會快速閃動。測量誤差取決于EV1000參數(shù)F7.32和計時器T4：1的時基。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應用程序大同小異，但基本思路是一樣的，本方法在小型PLC應用中具有實際意義，當模擬量端口緊缺的時候，尤為實用。注意EV2000變頻器的Y2只能選擇0-19，可用D0代之。

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