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针对真空退火炉容积大、温控精度高和多温区差异性小的特点,提出了一种基于S7-300 PLC、PROFINET工业以太网总线、双冗余监控计算机的退火炉控制系统。采用PLC编程软件的闭环连续PID控制器FB41功能块实现了9段炉体恒温控制。通过组态王6.55软件编写的上位监控系统,实现了现场工况监控、趋势曲线显示和数据存储等功能。利用Win CC flexible软件开发了现场触摸屏控制程序,通过工业以太网与上位工控机通讯。生产应用效果表明,控制系统在控温精度和多温区恒温性方面效果显著。
Aiming at the characteristics of large volume of vacuum annealing furnace, high temperature control precision and little difference in multi-temperature zone, an annealing furnace control system based on S7-300 PLC, PROFINET industrial Ethernet bus and dual redundant monitoring computer was proposed. Closed-loop continuous PID controller with PLC programming software FB41 function block to achieve a 9-segment furnace temperature control. Kingview 6.55 software through the preparation of the host monitoring system to achieve on-site condition monitoring, trend curve display and data storage and other functions. The use of Win CC flexible software developed on-site touch-screen control program, through industrial Ethernet and IPC communications. Production application results show that the control system in the temperature control accuracy and multi-temperature zone temperature effect is obvious.