描述
PLC中的定时器相当于继电器系统中的时间继电器。它有一个设定值寄存器(一个字长)、一个当前值寄存器(一个字长)和一个用来储存其输出触点状态的映像寄存器(占二进制的一位)，这三个存储单元使用同一个元件号。FX系列PLC的定时器分为通用定时器和积算定时器。
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