基于PLC的双容水箱液位控制.doc

摘 要 本次毕业设计的课题是基于PLC的液位控制系统的设计。PLC已广泛地使用微处理器作为中央处理器，输入输出模块和外围电路也都采用了中、大规模甚至超大规模的集成电路，PLC已不再是仅有逻辑(Logic)判断功能，还同时具有数据处理、PID调节和数据通信功能。它采用了可编程序的存储器，用来在其内部存储执行逻辑运算，顺序控制、定时、计数和算术运算等操作的指令，并通过数字式和模拟式的输入和输出，控制各种类型的机械或生产过程。可编程控制器及其有关外围设备，易于与工业控制系统联成一个整体，易于扩充其功能的设计。可编程控制器已成为工厂自动化的强有力工具，得到了广泛的普及推广应用。 FX系列开发环境，可对水箱的各个部分的运行程序进行设计。同时采用三菱公司FX2系列PLC对水箱也为控制系统进行了仿真，验证了该控制系统的可行性。实现了上水箱液位到达设定值以后能过流入到下水箱,I/O口的配置、硬件连接。本设计的重点和难点：水箱各部分程序的设计，对应程序的调试与修正。 关键词：FX2系列PLCPID控制算法双容水箱PID指令 The subject of graduation design is based on PLC, liquid level control system design. the Plc has been widely used as a central processing unit microprocessor, import export module and the external circuits are used, large-scale integrated circuits even when the Plc is no longer the only logical (IC) judgement functions also have data processing, PID conditioning and data communications functions. International It used programmable memory, used to implement logic in their internal storage operations, sequence control, timing, counting and arithmetic operations, such as operating instructions, and through digital and analog input and output, the control of various types of machinery or production processes. Programmable controller and related peripherals, and industrial control systems easily linked to form a whole, to expand its functional design. Programmable controller for the user, is a non-contact equipment, the procedures can be changed to change production processes. The programmable controller has become a powerful tool for factory automation, widely popular replication. The paper simply introduces main structure and characteristics of garage and also gives a short introduction to its control system. The finite element reliability checking of steel structure of garage is utilized according to the operation principle of water-tans garage, the mechanics was used to comprehensively analyze the water-tans and translation stereo garag Keywords：FX2 series PLCPIDcontrol algorithm；Double-dimension tank