基于PAC的测控系统设计与实现

Design and Realization of Measurement and Control System Based on PAC

摘要:

为实现某化学分析测量仪器自动化测控需求,设计并组建了一套基于工业计算机与可编程自动化控制器(programmable automation controller,PAC)的测控系统；系统上位机通过以太网监控下位机的运行状态,实时显示该仪器中电磁阀开关状态、温度、压力和流量等参数信息；下位机按仪器流程需要设定控制程序,实现对各单元设备的控制和数据采集；并通过设计基于工作流程的数据结构、模块化开发和多线程等技术,编制了系统测控软件；系统具备工作流程定制、数据自动记录、自动报警和自动运行等功能,成功与用于该仪器中；经过多次实验验证和现场工作,测控系统稳定可靠。 

Abstract:

In order to realize automatic measurement and control of a chemical instrument,a system of control and mesurement base on an industrial computer and PAC(Programmable Automation Controller) is designed and set up. The state of lower computer is monitored by the upper computer through Ethernet,the upper computer shows the state fo each value switch and the imformation of temperature,pressure and flow in the instrument. The measurement and control software base on modular development,data structure of workflow and multithreading technology is written. The system was designed to have functions of workflow custommization,automatically alarming,automatically data recording,automatically running,and has been successfully used in chemical instrument. After many experiments and field work,the stability and reliability of the measurement and control system is stable and reliable.