基于西门子S7-400系列PLC的现地控制单元冗余设计

Redundancy Design for LCU Based on Siemens S7-400 Series PLC

讨论了基于西门子S7-400系列可编程逻辑控制器(PLC)的水电厂计算机监控系统现地控制单元的冗余设计,对硬件冗余结构和特点、软件冗余原理及其实现进行了详细描述,并强调了电源及重要输入输出的冗余设计。这种冗余设计可大大提高计算机监控系统的可靠性,满足水电厂实现“无人值班”(少人值守)的要求。

This paper discusses the redundancy design for the LCU of computer monitoring and control system of hydropower plants based on Siemens S7-400 series PLC. The structure and characteristics of the hardware redundancy, the principle of the software redundancy and its realization are illustrated in detail. The redundancy design of power supply and important input/ output is discussed. The reliability of the computer monitoring and control system can be improved by the redundancy design. And the demand for an unmanned hydropower plant can be satisfied.