基于PLC锅炉水位控制.doc

基于PLC的汽包水位自动控制系统设计 摘 要 以某厂的35T／h蒸汽锅炉为对象，结合蒸汽锅炉的结构，设计了一套基于PLC的汽包水位自动控制系统设计。 系统设计采用罗克韦尔自动化公司的ControlLogix系列PLC，配置Logix 5550型号的1756-L1 M2处理器模块，模拟量输入采用1756-OB16D模块，数字量输出采用1756-IF6I模块，以太网通讯接口采用1756-ENBT模块，设备网通讯接口采用1756-DNB模块，控制系统使用编程软件RSLogix5000来设计锅炉控制的梯形图。为了维持汽包水位的稳定，采用了三冲量串级控制，有效克服了“虚假水位’’对汽包水位控制的影响。 系统采用工控机作为上位机，并使用罗克韦尔自动化公司的RSView32进行监控界面的设计，这样能够使得在上位机上实时监控系统的运行状况并可以设置系统的工作参数。使用罗克韦尔RSLINX软件完成系统通讯网络的组建，来完成以太网，设备网之间的通讯。控制系统遵循的PID参数整定的工程整定方法，并模拟研究，最总完成系统设计，PLC在锅炉汽包水位控制系统的最终完成。 关键词：汽包水位控制 三冲量 PID控制 PLC 工业以太网 The Design of the Boiler Drum Water LevelControl System with PLC ABSTRACT In a factory 35T / h steam boiler for the object, binding steam boiler drum level design of a PLC automatic control system design is based. System design using Rockwell Automations ControlLogix series PLC, configure the Logix 5550 model 1756-L1 M2 processor module, analog input using the 1756-OB16D modules, digital output modules using the 1756-IF6I, Ethernet communication interface uses 1756-ENBT module, network communication equipment interface with 1756-DNB module, control systems use programming software to design the boiler control RSLogix5000 ladder. In order to maintain the stability of drum level, using a three-impulse cascade control, effectively overcome the impact of the false water level of drum level control. System uses IPC as a host computer, and using Rockwell Automations RSView32 monitoring interface design, so the PC can be made in real-time monitoring system on the operating conditions and operating parameters of the system can be set. Rockwell RSLINX software to complete the formation of the communication network system to complete the communication Ethernet network between devices. PID parameter tuning control system engineering followed tuning methods and simulation studies, most of the total completion of the system design, PLC in the boiler drum level control system finalized. KEY WORDS: Steam drum water level Three impulses control PID control PLC