IC693BEM331K

IC693BEM331K

  目前，小型PLC为单CPU系统，而中、大型PLC则大多为双CPU系统，甚至有些PLC中多达8 个CPU。对于双CPU系统，一般一个为字处理器，一般采用8位或16位处理器；另一个为位处理器，采用由各厂家设计制造的芯片。字处理器为主处理器，用于执行编程器接口功能，监视内部定时器，监视扫描时间，处理字节指令以及对系统总线和位处理器进行控制等。位处理器为从处理器，主要用于处理位操作指令和实现PLC编程语言向机器语言的转换。位处理器的采用,提高了PLC的速度，使PLC更好地满足实时控制要求。

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