现代的PLC都具有数学运算、数据传送、转换、排序和查表等功能，可进行数据的采集、分析和处理，同时可通过通信接口将这些数据传送给其它智能装置，如计算机数值控制（CNC）设备，进行处理PLC的通信包括PLC与PLC、PLC与上位计算机、PLC与其它智能设备之间的通信，PLC系统与通用计算机可直接或通过通信处理单元、通信转换单元相连构成网络，以实现信息的交换，并可构成“集中管理、分散控制”的多级分布式控制系统，满足工厂自动化（FA）系统发展的需要。
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