Development of Description Language of Control Programming for Distributed Control System

近年来，由于产品的多样化，人们越来越需要分布式过程控制。在分布式过程控制系统中，不同公司生产的各种设备混合在一起，相互影响。因此，分布式过程控制系统的控制程序开发难度较大，因此有必要规范分布式控制逻辑的描述方法，改进软件开发环境，将过去的程序转换为新的标准格式。我们关注了IEC（国际电工委员会）TC65中关于分布式控制系统的功能块（FB）描述，并利用FB开发了分布式过程控制的编程工具。为了实现该工具，对分层结构、仿真验证等功能规范进行了分析。另外还提出了支持方法；从现有工厂的输入/输出信号中提取梯形图中的控制程序的方法，将逻辑转换为控制流程的方法等。通过开发具有标准化描述和相关技术支持的编程工具，为实际使用该工具奠定了基础。

For diversification of products, recently, distributed process control has become desired more and more. In distributed process control systems, various devices made by different companies are mixed and affect each other. Therefore, it is difficult to develop control programs of distributed process control systems, so standardizing a description method of distributed control logic, improvement of software development environment, and transforming past programs to a new standard format are necessary.We pay attention to Function Block (FB) description for distributed control systems, which is establishing in IEC (International Electric Committee) TC65, and developed a programming tool for distributed process control by using FB. In order to realize this tool, specifications of functions about hierarchical structure, simulation for verification, etc. were analized.Another support methods has also proposed; a method to extract control programs in a radder diagram form input/output signals of existing plants, a method to transform the logic to control flows, etc.By the development of a programming tool which equips a standardizing description and relevant technologies to support it, basis to use the tool in practical has been established.