描述

PR6423/003-030+CON021

PLC梯形图程序中的计数器的最高工作频率受扫描周期的限制，一般仅有几十Hz。在工业控制中，有时要求PLC有快速计数功能，计数脉冲可能来自旋转编码器、机械开关或电子开关。高速计数模块可以对几十kHz甚至上百Hz的脉冲计数，它们大多有一个或几个开关量输出点，计数器的当前值等于或大于预置值时，可通过中断程序及时地改变开关量输出的状态。这一过程与PLC的扫描过程无关，可以保证负载被及时驱动。

FX2N的高速计数模块FX2N–1HC有1个高速计数器，可作单相/双相50kHz的高速计数，用外部输入或通过PLC的程序，可使计数器复位或起动计数过程，它可与编码器相连。单相1输入和单相2输入时小于50kHz，双相输入时可设置为1倍频、2倍频和4倍频模式，计数频率分别为50kHz，25kHz和12.5kHz。计数值为32位有符号二进制数，或二进制16位无符号数(O～65535)。计数方式为自动加/减计数(1相2输入或2相输入时)或可选择加/减计数(1相1输入时)。可用硬件比较器实现设定值与计数值，一致时产生输出，或用软件比较器实现一致输出(最大延迟200µs)。它有两点NPN集电极开路输出，额定值为DC5～12V，0.5A。瞬时值、比较结果和出错状态均可监视，在程序中占8个I/O点。

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PR6423/003-030+CON021

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