监视定时器指令WDT（P）编号为FNC07，没有操作数，占有1个程序步。WDT指令的功能是对PLC的监视定时器进行刷新。

      FX系列PLC的监视定时器缺省值为200ms（可用D8000来设定），正常情况下PLC扫描周期小于此定时时间。如果由于有外界干扰或程序本身的原因使扫描周期大于监视定时器的设定值，使PLC的CPU出错灯亮并停止工作，可通过在适当位置加WDT指令复位监视定时器，以使程序能继续执行到END。

如图1所示，利用一个WDT指令将一个240ms的程序一分为二，使它们都小于200ms，则不再会出现报警停机。

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51401551-300 Honeywell TDC 3000 68020 w/3 mg (51401551-300)
51401551-400 Honeywell TDC 3000 68020 w/4 mg (51401551-400)
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51401551-800 Honeywell TDC 3000 68020 w/8 mg (51401551-800)
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