S7-300C 集成高速计数器功能, 以314C 为例, 集成4 路60kHz的高速计数器。计数可分为：
1、连续计数--计到上跳到下限从新开始。
2、计数--计到上跳到下限等待新的触发。
3、周期计数--从装载值开始计数, 到可设置上跳到装载值从新计数。
操作
4.2 控制参数的设置
1、主计数方向可分上/下计数
2、门功能--只有在门打开时计数值才有效
1) 取消计数--门再次打开时计数值清零
2) 停止计数--门再次打开时计数从上次计数值开始计数
3、开始/停止值--周期计数时上限值
4、比较值--用于产生中断
5、滞后值— 可防止临界时产生的扰动
操作参数
4.3 输入/输出的设置
1、输入--1) 脉冲, 2) 硬件门, 3) 计数方向, 硬件门可使计数值更加
2、输出--1) 设置比较器用于触发快速输出 2) 可设置输出点脉冲时间
输入输出设置
4.4 中断设置
产生中断调用OB40(在basic parameters 选择中断或诊断+中断)。
基本参数选择中断
中断可选择：
1、硬件门开中断 2、硬件门关中断 3、接近比较值中断4、超上限中断 5、超下限中断
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