描述
PLC系统的通信网络中，上级的网络通信速率应大于1Mbps，通信负荷不大于60%。PLC系统的通信网络主要形式有下列几种形式：1）PC为主站，多台同型号PLC为从站，组成简易PLC网络；2）1台PLC为主站，其他同型号PLC为从站，构成主从式PLC网络；3）PLC网络通过特定网络接口连接到大型DCS中作为DCS的子网；4）专用PLC网络（各厂商的专用PLC通信网络）。
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。
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