加计数器用于计数累加到设定值，范围 0 ～ +32,767。当计数器复位端为 ON, 当前值被复位至 0. 当使能从 OFF 变为 ON,计数器加 1。计数值可以超出预置 值 PV，只要当前值等于或大于预置值，计数器输出就为 ON.计数器输出状态 在断电时仍保持，但在电源上电时不会自动初始化。
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