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23. 梯形图编程的基本规则

  • 2026-02-05 00:46:09
23. 梯形图编程的基本规则

23. 梯形图编程的基本规则

核心原则:

梯形图的设计需遵循电气控制电路的习惯,同时符合PLC软件的逻辑执行顺序(通常为“从左到右,从上到下”),以确保程序正确、高效、易读。


具体规则详解:

  1. 触点使用次数无限
    • PLC内部的输入、输出、辅助继电器等软元件的触点(常开/常闭)在编程时可以无限次重复使用,这与物理继电器触点数量有限有根本区别。
  1. “左重右轻,上重下轻”布局原则
    • 触点靠左,线圈靠右:每一逻辑行(或称“梯级”)必须从左侧的“母线”(起始竖线)开始,按逻辑顺序连接触点,最后以输出线圈、计时器、计数器或指令盒结束。触点不能出现在线圈的右侧(除特殊指令如AENO外)。
    • 串联多的电路块靠上:在并联电路中,应将串联触点较多的支路安排在梯形图的上方(如图a部分所示)。这样布局可以减少指令条数,使逻辑更清晰。
    • 并联多的电路块靠左:在串联电路中,应将并联触点较多的电路块安排在梯形图的最左侧(如图b部分所示)。同样是为了优化程序结构,便于阅读和分析。

(图片摘自《现代电气控制及PLC应用技术》(王永华))

  1. 避免“双线圈输出”
    • 在同一个程序中,同一编号的输出线圈(或对同一变量的写操作)只能使用一次。如果多次使用(双线圈),PLC在循环扫描时,只有最后一个线圈的状态会被有效输出,极易导致逻辑混乱和误动作。S7-200系列PLC明确禁止此操作。
  1. 线圈/指令盒不直接接左母线
    • 输出线圈或功能指令盒一般不能直接连接到左侧母线上。如果逻辑上需要始终执行的输出,可以通过一个“常ON”的特殊继电器(如S7-200中的SM0.0)的触点来连接,以符合“触点-线圈”的结构要求。
  1. 绘图规范(主要针对手工绘图)
    • 触点画在水平线上
      :避免将触点绘制在垂直分支线上,以保证梯形图的规范和易读性。现代编程软件通常已强制此规则。
    • 无触点分支线垂直画
      :对于不包含触点的直接连接线(即“桥接”或“跳转”线),应画成垂直方向,而非水平方向,使图面更规整。
    • 推荐画法
      :整体布局应遵循“左重右轻,上重下轻”的原则,并保持图面清晰、工整,这既是编程好习惯,也有助于程序优化。

总结要点:

  • 结构是基础
    :确保每行逻辑以左母线开始,以线圈/指令结束,触点居左。
  • 布局是关键
    :通过“串联靠上、并联靠左”的优化布局,可以使生成的程序代码更简洁,执行效率更高,同时大幅提升可读性。
  • 禁忌需牢记
    绝对避免双线圈输出,并注意线圈不能直连左母线。
  • 规范为效率
    :清晰的绘图规范(尤其是手工绘图时)是保证程序被准确理解和维护的重要保障。

这些规则共同构成了编写正确、高效、可维护的PLC梯形图程序的基础。

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  1. CONNECT:[ UseTime:0.000962s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001740s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000615s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000624s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001442s ]
  6. SELECT * FROM `set` [ RunTime:0.000485s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001641s ]
  8. SELECT * FROM `article` WHERE `id` = 471382 LIMIT 1 [ RunTime:0.034389s ]
  9. UPDATE `article` SET `lasttime` = 1770443022 WHERE `id` = 471382 [ RunTime:0.001459s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000681s ]
  11. SELECT * FROM `article` WHERE `id` < 471382 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.017492s ]
  12. SELECT * FROM `article` WHERE `id` > 471382 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.027386s ]
  13. SELECT * FROM `article` WHERE `id` < 471382 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.066008s ]
  14. SELECT * FROM `article` WHERE `id` < 471382 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.148941s ]
  15. SELECT * FROM `article` WHERE `id` < 471382 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008855s ]
0.473765s