描述
针对这些必需的输入点数,选用了fx1s-30mr的plc,因为选用了人机界面,其它一些手动动作,如前进、后退、换刀等都通过人机界面实现,不需占用plc输入点,从而为选用低价位的fx1s系列plc成为可能,因为fx1s系列plc输入点最多只有16点。另外此系列plc的高速计数器具有处理频率高达60千赫的脉冲的能力,足可以满足切纸机对精度的要求。
3.2编码器的选取
编码器的选取要符合两个方面,一是plc接收的最高脉冲频率,二是进给的精度。我们选用的是编码器分辨率是500p/r(每转每相输出500个脉冲)的。通过验正可以知道此分辨率可以满足上面两个条件。验证所需的参数:电机最高转速是1500转/分(25转/秒)、进给丝杆的导程是10mm/转。验证如下:
本系统脉冲最高频率=25转/秒×500个/转×2(a/b两相)=25khz
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