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西门子PLC编程小白攻略:从顺序控制到逻辑运算

  • 2026-02-05 13:12:38
西门子PLC编程小白攻略:从顺序控制到逻辑运算

西门子PL.C编程小.白攻.略:从顺..控制到逻辑运算

大家.好!..是老张,在自动化行业摸.爬滚打了十几.年。今天.咱们....些让人头.疼的理论,直接上.手西门子PLC编程的核心技.能——顺序控.制和逻辑运算。就..做饭先学会开.火一样,这两个技能是你玩转PLC的基础。

1

一、先搞懂这两个核心概念

顺序控...像自动洗.衣机的工作流程..进水.→洗涤→排水..脱水,..步接一步,不能乱。.在P.LC.里,我们常用“启保停电.路”来实.现。

逻辑运.就是“与”、..或”、“.非”这些判断。.比如你家.客厅灯,进门(.条件1)并且.黑(条件2).才亮,.这就是“与”运算。

2

二、经典案例:电机正反转控制

这个案例在.工厂..到处都是,.咱们边看.边学..

梯形图实现(.使用S7.-200 SMART软.件):

// 网络1:正转启动

// I0.0=正转按钮,I0.2=停止按钮,Q0.0=正转输出

LD   I0.0        // 按下正转按钮

O   Q0.0         // 或正转已经运行

AN  I0.2         // 且没有按停止

AN  Q0.1         // **重要!且反转没有运行(互锁)**

=   Q0.0         // 输出正转

// 网络2:反转启动(结构同上,互锁正转)

LD   I0.1

O   Q0.1

AN  I0.2

AN  Q0.0         // 互锁正转

=   Q0.1

接线图重点提醒.

主电路:       控制电路:

KM1(正转)---Q0.0   按钮---I0.0/I0.1

KM2(反转)---Q0.1   停止---I0.2

!致命细节:务必在KM1.和KM2的线.圈回.路中加入.件互锁(常闭触点.互换),仅靠程序互锁万一P.LC.输出.故障,两个接..器同时吸合.就直接短路放炮了!.我徒弟就因为省这几.根线,.烧过一套设备。

3

三、逻辑运算的实战妙用

场景:一个包.装线,要...有产品.到位(I0.3) . 防护门.关闭(I0.4)  急停未按.下(I0.5.)”时才能启动。

// 网络3:安全启动条件

LD   I0.3        // 有产品

A    I0.4        // 且门关闭

AN   I0.5        // 且没急停

=    M0.0        // 安全条件满足标志位

调试技巧:在线监控时,.右键变..→“修.改为1/0”,可以手动强制条件,快速排查是哪个.传感器出问题。这是老..程师压箱底的.效率秘籍。

4

四、新手必踩的坑和解决方案

  1. 双线圈冲突..一个.Q点在不同.网络被多次输出..PLC以..后一个为..解决..:用中间位(M点)过.渡。

  2. 扫描周期陷阱.PLC从上到下执.行,.如果你.在程序开头.读取了.I.0.0的状态,..间经过10ms处理,.这时按钮已经松开,但程序.开头读到的状态还是“1....决方案.:用“沿..发”.(P指令)捕捉瞬间动作。.

  3. 地址.写错:把Q0..0.写成Q0.1,输..接错线.建议.在图纸上用.标签纸标好每个点..功能,比如“Q0.0-推料.气缸”.

5

五、下一步练习建议

找个仿真软.件(如S7-PLCSIM),先.实现一个“小车自..往返”程序..按启动→.右行到限位→停2秒→左行到限位→循环。要求加.入启.动前“.原位检测”逻辑。

记住,PLC编.程就像搭...,先把基础逻辑块练熟。.下次咱们聊聊怎么用定.时器和计数器..设备“活”起来。遇到问题.别怕,每个故障都.是最好的老师.——我柜.子里那些烧坏.的模.块可以作证。

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  1. CONNECT:[ UseTime:0.001124s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001860s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000734s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000693s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001573s ]
  6. SELECT * FROM `set` [ RunTime:0.000616s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.002026s ]
  8. SELECT * FROM `article` WHERE `id` = 473525 LIMIT 1 [ RunTime:0.001380s ]
  9. UPDATE `article` SET `lasttime` = 1770438164 WHERE `id` = 473525 [ RunTime:0.021452s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000684s ]
  11. SELECT * FROM `article` WHERE `id` < 473525 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001276s ]
  12. SELECT * FROM `article` WHERE `id` > 473525 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001135s ]
  13. SELECT * FROM `article` WHERE `id` < 473525 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001942s ]
  14. SELECT * FROM `article` WHERE `id` < 473525 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002212s ]
  15. SELECT * FROM `article` WHERE `id` < 473525 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007202s ]
0.207482s