描述
为减轻CPU通信任务，根据网络组成的实际需要，应选择具有不同通信功能的（如点对点、现场总线、工业以太网）通信处理器。PLC和编程器公用一个CPU，编程器在编程模式时，CPU只为编程器提供服务，不对现场设备进行控制。完成编程后，编程器切换到运行模式，CPU对现场设备进行控制，不能进行编程。
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