Question

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本设计是应用S7-200PLC可编程控制器的PID功能，同时采用MCGS监控软件来实现液位的整定和监控。利用S7-200PLC提供的PID回路指令进行参数整定的程序设计，并配合PLC自带的模拟量输入/输出扩展模块，通过PC/PPI通讯电缆来实现PLC跟MCGS组态软件的通讯,建立系统数据库、确定变量表及I/O通道的分配制作人机对话界面，监控液位PLC控制系统的运行情况。利用工程整定的方法并根据液位串级控制系统在P控制，PI 控制、PID控制时的不同曲线情况，整定出了液位串级控制系统最佳的满足实际要求的PID参数，使系统液位的衰减比达到了4:1的比例，实现了对系统液位串级控制的目的。
结果表明，系统采用的串级控制，具有克服被控过程较大的容量滞后，抑制变化剧烈幅度较大的扰动，克服被控过程中的非线性等优点；同时S7-200 PLC 抗干扰能力强、编程简单、组网方便、适用于工业控制场合；组态王软件易于快速构造和生成计算机监控系统，这些都使得本系统具有较好的实用价值。

Answer 1

This design is the application of S7-200PLC programmable PID controller function, also used monitoring software to achieve the level MCGS The setting and monitoring. Using S7-200PLC instructions provided by the PID loop tuning of the program design, and comes with the PLC analog input / output expansion module, through the PC / PPI cable to achieve communication with the PLC configuration software MCGS communication, the establishment of the system database to determine the variable table and I / O channels of distribution create man-machine conversation interface, PLC control system for liquid level control operation. Use of engineering methods and tuning cascade control system according to level in the P control, PI control, PID control of the situation of the different curves, the entire set of the level cascade control system best meet the practical requirement of PID parameters, the system solution bit attenuation ratio reached 4:1, the system level to achieve a cascade control.
The results show that the system used in cascade control, with greater capacity to overcome the lag controlled process, inhibit the rate of rapid change, a large disturbance to overcome the alleged advantages of the nonlinear process; the same time anti-jamming capability S7-200 PLC Strong, simple to program, Zuwang Fang would apply to industrial control situations; Configuration software is easy to quickly construct and generate computer monitoring system, which are made of this system has good practical value.

Answer 2

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