P0911NJ

描述

1．高速计数器概述

21点高速计数器C235～C255共用PLC的8个高速计数器输入端X0～X7，某一输入端同时只能供一个高速计数器使用。这21个计数器均为32位加/减计数器(见表3–7)。不同类型的高速计数器可以同时使用，但是它们的高速计数器输入不能冲突。

高速计数器的运行建立在中断的基础上，这意味着事件的触发与扫描时间无关。在对外部高速脉冲计数时，梯形图中高速计数器的线圈应一直通电，以表示与它有关的输入点已被使用，其他高速计数器的处理不能与它冲突。可用运行时一直为ON的M8000的常开触点来驱动高速计数器的线圈。

当X14为ON时，选择了高速计数器C235，从表3–7可知，C235的计数输入端是X0，但是它并不在程序中出现，计数信号不是X14提供的。

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