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辅助继电器（M）
在PLC内部的继电器叫做辅助继电器。与输入输出继电器不同，它是一种内部继电器，因此不能读取外部输入，不能直接驱动外部负载。辅助继电器中有一部分具有掉电保持功能，即使PLC的电源断电，也还能储存其ON/OFF状态。
状态元件（S）
是一种步进梯形图或SFC表达工序号用的继电器。
不作工序号使用时,也当作与辅助继电器相同的接点/线圈来使用。也可作信号器，用作外部故障诊断。
定时器
定时器是将PLC内的1ms,10ms,100ms等时钟脉冲进行加法计数，当它达到设定值时，输出接点就动作。定时器的定时范围为0.001~3276.7秒。
T192~T199也可以用于子程序和中断子程序内。
T250~T255是100ms累积定时器，其当前值为累积数，所以，定时线圈的驱动输入为OFF时，当前值被保持，作为累积操作使用。
计数器
计数器根据目的和用途可分为如下几种，
[内部计数用] 通用/停电保持用16位计数器：向上计数用，计数范围为1~32，76732：向上/向下计数用，计数范围为-2，147，483，648~+2，147，483，647。
这些计数器是PLC的内部信号用的，其响应速度通常为数10Hz以下。
[高速计数器用] 停电保持用
32位计数器：向上/向下，计数范围为-2，147，483，648~+2，147，483，647（1相1计数，1相2计数，2相2计数），分配在输入继电器X000~X007。
高数计数器与PLC的运算速度无关，***高计数为60kHz。
数据寄存器(D) (V) (Z)
数据寄存器是存储数值数据的元件。FX PLC的数据寄存器全是16位的（***高位是正负符号位），用二个寄存器组合就可以处理32位（***高位为正负位）数值。（数值范围同上述的“计数器”一项）。与其它元件一样，数据寄存器有一般用和掉电保持用两种。
数据寄存器之中还有被称为寻址用的V、Z寄存器（V0~V7，Z0~Z7，共16点）。V、Z还可按下述，附加其它元件使用。
[V0，Z0=5时] D100V0=D105 C20Z0=C25←元件编号+V0或Z0值。
数据寄存器和寻址寄存器被用于定时器、计数器的设定值的间接指定、应用指令之中。
常数（K）（M）
PLC使用的各种数值中，K为十进制整数，H为十六进制数。这些可用作定时器、计数器的设定值、当前值和应用指令的操作数。
指针（P）（I）
有分支用、中断用两种。分支用指针用于指定FNC00（CJ）条件跳转、或FNC01（CALL）子程序调入的地址。中断指针用于指定输入中断、定时中断、计数中断的中断子程序。
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