针对液化气灌装厂的生产特点、安全要求和现有的 PLC 控制系统，介绍了基于CC-Link 总线的分布式控制系统的构成及其实现方法。应用表明该系统功能齐全，实时性好，通讯速度快，组态容易，现场布线简单，系统的可靠性和安全性较高，满足了液化气灌装生产和安全要求。关键词：液化气；CC-Link 总线；PLC；监控系统Abstract: According to the manufacturing characteristic , safety request , PLC control system of city gas bottling plant. In this paper, the constitute and the function implement of distribute control system based on CC-Link bus is introduced. The application of this system indicates which has full-scale functions, good realtime , fast communication speed, higher reliability and safety , and can meet the request of city gas bottling and safety.Keywords: city gas; CC-Link bus; PLC; monitoring and control system