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s7300时间继电器怎么用 | 找知识-找PLC

s7300时间继电器怎么用

各位大侠:1.小弟初学300,感觉比200难理解一些。300里有几种时间继电器,每个时间继电器都有个功能框图和线圈,在程序中需要同时驱动框图和线圈吗,还是两个只要驱动一个就行了。还有就是这些定时器的时基(10MS 100MS 1S 10S)是怎么指定的?
2.小弟还想问一下,这个PID的初始参数值是怎么确定的,是像网上下载的有个经验值那样的吗?

最佳答案

1、有关定时器:建议系统看看:
《西门子PLC定时器使用教程》,连接:
http://wenku.baidu.com/view/9f5688fe04a1b0717fd5ddbe.html
《step7中有关时间和定时器的使用和例程(2007.09.03)》   下载: 
 http://www.ad.siemens.com.cn/download/searchResult.aspx?searchText=A0087
2、PID的初始参数值是怎么确定的?
转帖:
FB41的PID:
 一、在ob35里面插入FB41,方框顶上会有红字,输入一个类似“DB120”的,系统会问你要不要生成这个Db,yes就可以
  二、大部分参数不要填,默认就行,下面是常用参数,用变量连接:
  1、MAN_ON:用一个bool量,如m0.0,为true则手动,为false则自动;
  2、cycle:T#100MS,这个值与ob35默认的100ms一致;
  3、SP_INT:MD2,是hmi发下来的设定值,0-100.0的范围,real型;
  4、PV_IN:md6,实际测量值,比如压力,要从piw×××转换为0-100.0的量程;
  5、MAN:MD10,op值,也就是手动状态下的阀门输出,real型,0-100.0的范围;
  6、GAIN:md14,Pid的P啊,默认写1-2吧(系统默认是2),调试的时候再改
  7、TI:MW20,pid的i啊.默认写T#30S吧,调试的时候改;
  8、DEAD_W:md22,死区,就是sp和pv的偏差死区,0-100.0的范围,默认0,调试的时候改;
  输出:
  9、LMN:MD26,0-100。0,最终再用fc106转换为word型move到pqw×××,如果pid运算结果不再有工艺条件其他限制可以用LMN_PER更简单就不用fc106了。

提问者对于答案的评价:
谢谢各位,小弟受教了

原创文章,作者:more0621,如若转载,请注明出处:https://www.zhaoplc.com/plc297037.html

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