摘  要：ControlLogix PLC是美国罗克韦尔公司推出的大型可编程控制器，本文介绍了该PLC及其分布式I/O在水电厂监控系统中的应用。在满足对辅助设备的监控要求下，通过使用分布式I/O，简化了监控系统网络结构，减少了监控系统和辅助控制系统之间的转接设备，节约了建设成本，减轻了维护工作量。

关键词：监控系统   PLC   分布式I/O

Abstract: ControlLogix PLC is a large programmable controller which is produced by American Rockwell Automation, this paper introduces the application of the PLC and its Distributed I/O in the SCADA of hydropower plant. By using of the Distributed I/O, the network str