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fhy0410
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樓主  發(fā)表于: 2018-04-05 21:38
問(wèn)題是。例如在觸摸屏上輸入運行頻率33。2HZ, 加速時(shí)間30S,減速15S,變頻最高頻率是80HZ,最低頻率是0HZ,那么2DA對應的是0V(0)--0HZ,10V(4000)---80HZ,變頻頻率與2DA電壓這樣理解對嗎?要在PLC里計算每秒加速度的頻率,讓變頻直線(xiàn)線(xiàn)性加減速從0HZ一直直線(xiàn)加速度到33。2,在減到0。
如果要達到比較好的直線(xiàn)線(xiàn)性加減速,是不是要把33。2HZ轉換成浮點(diǎn)運算啊,還在如果用  DDIV  D0(33。2)  D2(30S/15)  D4,LDP M8013,DADD  D4  D6  D10,D10這樣的指令的話(huà),結果有時(shí)有小數,那這個(gè)結果與對應10V(4000關(guān)系怎樣對應,因為常有結果是小數,在之與4000這個(gè)對應的時(shí)間也常不是整數,在這個(gè)問(wèn)題上想好久都沒(méi)有明白透。第一次用2DA,如果要達到比較好的線(xiàn)性效果,因怎樣處理這個(gè)問(wèn)題,比較困惑,請各位有空的大神抽少少時(shí)間,指點(diǎn)迷津,或寫(xiě)個(gè)這幾步的程序給小弟學(xué)習一下。在些先謝過(guò)回答或看過(guò)些貼的朋友。
lin10663
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1樓  發(fā)表于: 2018-04-09 10:21
利用浮點(diǎn)demul dediv FLT  INT
FLT D100 D102
DEMUL D102 K3000 D110
DEDIV D110  K4000 D120
INT D120 D130
舉例給你了
努力~學(xué)習
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