摘 要： 组合开关通常使用可编程控制器（PLC）作为其核心控制和保护元件，但通用PLC在组合开关应用时由于无法克服的交流信号直接采样问题，从而导致产品的保护性能和可靠性无法满足现场要求。针对以上问题，和利时开发出专用PLC，对组合开关进行了量身定制，在为用户产品带来更高性能的同时降低了用户的使用成本。本文详细地介绍了和利时组合开关专用PLC的方案和产品。Abstract：Combination switch usually use the PLC as the core of control and protection devices, but universal PLC can’t  overcome the problem of sampling AC signal, which leading the problem of  protection performance and reliability . Hollysys special PLC,which designed on the customized combined switch,  can Improve the performance of the product with the lower cost. This paper introduces in detail the application of combination switch for PLC solutions and products. 关键词：  组合开关 可编程控制器 交流采集Key Word： combination switch