1、 - 1 - 摘要 本文以两种液体的混合罐装控制为例，将两种液体按一定比例混合，在电动机搅拌后要达到一定的温度才能将混合的液体输出容器。并形成循环状态。液体混合系统的控制设计考虑到其动作的连续性以及各个被控设别动作之间的相互关联性，针对不同的工作状态，进行相应的动作控制输出，从而实现液体混合系统从第一种液体加入到混合完成输出的这样一个周期控制工作的程序实现。设计以液体混合控制系统为中心，从控制系统的硬件组成、软件选用到系统的设计过程 (包括设计方案、设计要求、梯形图设计、外部链接通讯等 )， PLC 的产生和定义、过程控制的发展 ， FX2N系列可编程控制器的硬件掌握， PID 参数的整定及各
2、个参数的控制性能的比较，整个系统各个部分介绍和讲解 PLC 的过程控制指令 PID 指令来精确控制各项参数，旨在对其中的设计和制作过程做简单的介绍和说明。 关键词 ： 液体混合系统 周期控制 梯形图 FX2N系列 PLC PID 参数 PID指令 - 2 - Abstract The request is to a certain proportion by the three liquid mixture,stirring after the motor to reach a certain temperature can be mixed containers of liquids out
3、put,and form a cycle.Liquid hybrid systems of control designed taking into account the continuity of its action and charged with various equipment moves between the interrelated,and for different working conditions,and make the appropriate motor control output,thus realizing the liquid hybrid system
4、s from the first liquid added to the mixture to complete the output of such a cycle control of the program.Designed to liquid mixed as the central control system,control system from the hardware components,software system to choose the design process (including design,design process,design requireme
5、nts,the ladder design,external communications link,etc.),PLC creation and definition, process control development, FX2N series PLC hardware control, PID tuning parameters and various parameters of the control performance comparison,the entire system, introduce and explain the various parts of the PLC process control commands PID instruction to control the parameters precisely.Which seeks to the design and production process of doing brief introduction and description. Keywords： .Liquid hybrid systems cycle control ladder design FX2N series PLC PID parameters PID instruction
