西门子plc对于过程控制的前馈-反馈控制的梯形图怎么编写?

2025-03-15 11:26:35
推荐回答(3个)
回答1:

这种东西肯定没有现成的资料。

我刚做了两个液位控制,用的是变频泵,用阀门也行,都是PID。

不过,做过就知道了,这个说起来很麻烦,做起来到不是很麻烦。

你自己看下PID的那个公式,懂了原理了,设参数就很简单了。西门子的PLC有一个PID控制,是FB41吧(记不清了,也没学会怎么用,也没用它),我用的是自己编的PID子程序块FB39。

网上的设参数(参数整定)的成功经验,我看了很多,最后也没看懂。你这样,看下最原始的公式就明白了,明白了控制原理,就知道怎么设参数了。PLC编程,你不必刻意用T型图,其实指令不难学,逻辑控制用T型图,别的程序像判断,计算等还是指令简单。

回答2:

你可以先进行简单的前馈控制,根据实际情况来把误差减小,然后切换到闭环系统用PID调节好了。

回答3:

要看你工艺流程,一般用PID功能模块和加法模块

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