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一个叫做“憨憨”的PLC:大话梯形图编程原则

  • 2026-02-04 08:13:27
一个叫做“憨憨”的PLC:大话梯形图编程原则

       假给一个脑子很直非常听话憨憨”画接线图这个憨憨”就是PLC,它只会严格按照你画的图,从左到右、从上到下,一遍遍地检查开关通不通,然后决定要不要通电。

      梯形图编程的原则用最通俗的大白话来讲,就像搭积木或者接电线。而这个憨憨不懂得变通,只认几条最重要的行为原则

举个栗子

1从左到右,左边是“电源”,右边是“灯泡”(你要控制的设备)一条道走到黑你的任务就是画一些“开关”(触点),把这些开关串或并在电源和灯泡之间开关没画完,绝不能先接灯泡!(线圈必须在最右边)

2一个灯泡,一个开关组

最好一个“灯泡”只由一套开关逻辑来控制。别在东边按一下开关能开灯,在西边按另一个开关也能开这盏灯(指程序里多个地方控制同一个输出),这样会让“憨憨手忙脚乱

如果真要多个地方控制,你得先用逻辑把信号汇总,再用一个总开关去控制灯泡。

3、开关怎么排列“重”的靠边放“重”是开关数量多、逻辑复杂。

     串联的“重块”往上放如果你有好几条并联的支路,就把串联开关最多的那条支路放在最上面。这样憨憨”检查起来最快。

     并联的“重块”往左放如果你有好几个串联的块要并联,就把并联分支最多的那块挪到最左边这样线路最清晰。

4、给每个位置都贴“便

    必须做到把“I0.0”改写成“启动按钮”,把“Q0.5”改写成“输送带电机”。这是重要的不要以为自己三个月后还能记住“I0.0”是启动按钮还是停止按钮

     给每一组开关逻辑(每个网络)写个小标题,比如:“主电机启动自锁”、“报警灯闪烁”这就像给你画的电路图加上章节标题。

5、复杂的玩意,打成包裹

      如果一个功能反复出现(比如控制一台电机),就别每次都把所有的开关、定时器重新画一遍。把它做成一个“功能包”(函数或功能块或子程序),主程序里只需要调用这个“包”,输入“启动”、“停止”信号,它就能输出“电机运行”信号。现成的“电机控制器模块”,会让主电路图立刻清爽了。

6、安全第一,把“急停”直接串在线上

     像急停、过载这种要命的安全信号,直接把它当成一个物理开关,串联在控制“灯泡”的主回路里不要经过复杂的逻辑判断这样不管程序其他逻辑多乱,这个开关一断,电立马就没了。这叫“硬线安全逻辑”。

想象一下别人给你写了一张机操作说明

差劲的说明(不遵守原则毫无逻辑):

   “先按左边那个键,看灯是不是亮的,如果不是,再按右边下面那个键,然后……”

好的说明(遵守原则逻辑清晰):

1开机:插上电源(总开关)。

2选择模式:按“标准洗”按钮。

3开始:按“启动”键。

4安全提示:如果门没关好,机器不会启动(安全互锁)。

     梯形图编程就是在画一份连“傻子”都能看懂的、极其详细的设备操作指南。

    你的图越像第二份指南,程序就越可靠,以后你或别人修改程序修故障时就越容易。

     画得让别人(和三个月后的你自己)一眼就能看懂,不用猜,不用问,就知道这堆“开关”是想让哪个“灯泡”亮,以及在什么条件下亮。

     这就是最好的梯形图。

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  1. CONNECT:[ UseTime:0.000928s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001316s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000271s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000297s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000541s ]
  6. SELECT * FROM `set` [ RunTime:0.000194s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000705s ]
  8. SELECT * FROM `article` WHERE `id` = 462886 LIMIT 1 [ RunTime:0.001267s ]
  9. UPDATE `article` SET `lasttime` = 1770545096 WHERE `id` = 462886 [ RunTime:0.009936s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000297s ]
  11. SELECT * FROM `article` WHERE `id` < 462886 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000497s ]
  12. SELECT * FROM `article` WHERE `id` > 462886 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000393s ]
  13. SELECT * FROM `article` WHERE `id` < 462886 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003510s ]
  14. SELECT * FROM `article` WHERE `id` < 462886 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000893s ]
  15. SELECT * FROM `article` WHERE `id` < 462886 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007309s ]
0.140796s