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通用计数器的通道号：C0～C99，共100点。
保持用计数器的通道号：C100～C199，共100点。
通用与掉电保持用的计数器点数分配，可由参数设置而随意更改。
由计数输入X011每次驱动C0线圈时，计数器的当前值加1。当*10次执行线圈指令时，计数器C0的输出触点即动作。之后即使计数器输入X011再动作，计数器的当前值保持不变。
l当复位输入X010接通（ON）时，执行RST指令，计数器的当前值为0，输出接点也复位。
l应注意的是，计数器C100～C199，即使发生停电，当前值与输出触点的动作状态或复位状态也能保持。
六、数据寄存器
数据寄存器是计算机必不可少的元件，用于存放各种数据。FX2N中每一个数据寄存器都是16bit（高位为正、负符号位），也可用两个数据寄存器合并起来存储32 bit数据（高位为正、负符号位）。
1）通用数据寄存器D通道分配D 0～D199，共200点。
只要不写入其他数据，已写入的数据不会变化。但是，由RUN→STOP时，全部数据均清零。（若特殊辅助继电器M8033已被驱动，则数据不被清零）。
2）停电保持用寄存器通道分配D200～D511，共312点，或D200～D999，共800点（由机器的具体型号定）。
基本上同通用数据寄存器。除非改写，否则原有数据不会丢失，不论电源接通与否，PLC运行与否，其内容也不变化。然而在二台PLC作点对的通信时，D490～D509被用作通信操作。
文件寄存器是在用户程序存储器（RAM、EEPROM、EPROM）内的一个存储区，以500点为一个单位，多可在参数设置时到2000点。用外部设备口进行写入操作。在PLC运行时，可用BMOV指令读到通用数据寄存器中，但是不能用指令将数据写入文件寄存器。用BMOV将数据写入RAM后，再从RAM中读出。将数据写入EEPROM盒时，需要花费一定的时间，务必请注意。
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