描述
为满足各种自动化控制系统的要求，近年来不断开发出许多功能模块，如高速计数模块、温度控制模块、远程I/O模块、通信和人机接口模块等。这些带CPU和存储器的智能I/O模块，既扩展了PLC功能，又使用灵活方便，扩大了PLC应用范围。
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