Description
增加了模拟量和PID调节等功能模块；运算速度提高，CPU的能力赶上了工业控制计算机；通信能力的提高发展了多种局部总线和网络(LAN)，因而也可构成为一个集散系统。特别是个人计算机也被吸收到PLC系统中。PLC在过程控制的发展将是一智能变送器和现场总线，暨向下拓展功能，开放总线。
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