就效率而言,操作系统将采用比RUN模式中所用分时值(通常每窗口约50ms)更长些的分时值。351/352 CPU的钥匙开关:改变方式和闪烁保护351 CPU有-钥匙开关,此开关在模块的前方,可用于保护闪烁存储器免遭改写。当你将钥匙转动至ON/RUN位置时,如钥匙不转至OFF位,则无人能够改变内烁存储器。从351 CPU和352 CPU的版本7开始,钥匙开关还有另一项功能:即可将PLC切换至STOP方式和RUN方式以及清除非致命故障,这在下一节进行讨论。
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