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西门子PLC小白逆袭:从入门到独立编程

  • 2026-02-05 00:40:00
西门子PLC小白逆袭:从入门到独立编程

西门子PLC.小白.逆袭:从入门到独立编程

大家好,我是你..的工控..友。.今天咱们.直接.上手,用一顿饭的功.夫搞懂西门子PLC怎么“动.起来”。.别怕,.这玩意儿说白了就是个“智能开关箱”,.比单.片机皮.实,专治工业现场的.各种“不服”。

1

一、PLC到底是个啥?先认亲兄弟

你可.以把P.LC(可.编程逻辑控制..)想象成一个特别.抗造.的工业版单片机。单片机像精密手表.,PLC则是工.地手表——功能直接、不怕灰、不.怕震。它们.的核心思维.是相通的:.输入→处理.→输出

  • 输入点(I)
    .就是PLC.的“眼睛”和“耳.朵”,接.按钮.、传感器.(如光电开..)。.
  • .输出点(Q)
    :就是PLC的“手”和“.脚”,.接继电.器、指示灯.、电机。.
  • C.PU
    :大脑.,负责执行你.写的程序。.
  • 梯形图
    :PLC最..用的.编程语言,画起.来像梯.子,其实就是.在模拟继电....,非常直观!

关键认..:PL.C编程不直接玩电子电路,.你是在.用软件..画”.出一个虚.拟电路,.然后下..到实体PLC里运.行。这大大降低了硬件门槛.

2

二、你的第一个项目:电机启停控制

咱们用最经典的“启保停”.电路开刀.,目标是:.按启动按钮,.电机转;按停止.按钮,电机.停;松开启动按.钮,电机还能保持.转动.(自锁)。.

1. 硬件接线(以S7-1200为例)

启动按钮(常开) → 接 PLC的 I0.0

停止按钮(常闭) → 接 PLC的 I0.1

电机继电器线圈 → 接 PLC的 Q0.0

!安全警.:实.操前务..断电!.24V.直流.电源正负极别接反,输出点Q要看.清是继电..型还是晶体管型,驱动负载别超额定电流。.

2. 梯形图编程(使用TIA Portal软件)

.开软件,新..项目,选.择你的.PLC型号(如CPU 1214C)。在主程序块(Main.)中画出.下图:

     I0.0        I0.1        Q0.0

    //---[ ]---+---[/]---+---( )---   //网络1:启动+自锁

              |         |

              +---[ ]---+

                 Q0.0

代码注释. - [ ] 表示常开触点,通电就通。 - [/] 表.示常闭..点,.通电就断.. - ( ) 表示线圈,得电就..作。 - 网络1:当I0.0(启动.)接通,且I.0.1(停.止)没动.作,Q0.0就通电。同时,Q0.0自.己的触点并联.在启动按钮上,形成“自.锁”,松开启动按钮后.电流仍能通过它自.己保持。.

3. 下载与调试

  1. 用网线.连接电.脑和PLC,在软件中..置好PLC的IP地址.(如192.168.0.1)。
  2. 点击“下.载”,将程序灌.入PLC。
  3. 切换.到“在线监控”模式,.你能看到触点和线圈的实时通.断状态(.变绿色.表示接.通)。这是最强大的..试工具.
  4. 按下按钮,.观察Q0.0.是否.动作。.

常见踩坑:第.一次下载.经常提...不到设备,.八成是.I.P地址.没在同一.网段..或者电脑防火墙/杀毒软件在捣乱,暂时关闭试试。

3

三、趁热打铁:加个闪亮指示灯

让电.机运行.时,指示灯每隔1秒闪烁,增加状态指示。

使用定时器(TON)

西门子提..了现成.的定时器.块。.在软件右侧指令列表找到“定时器.操作”->“TON.”(.接通延时定时.器),拖.到程序中。.

     Q0.0              TON_1

    //---[ ]-----------(TON)---   //网络2:电机运行时启动1秒定时器

                  IN  Q   | PT: T#1S

                          | ET

     TON_1.Q     TON_1.Q  指示灯

    //---[ ]-------+---[/]---( )---   //网络3:用定时器触点做闪烁

                   |

                   +---[ ]---+

                      TON_1.Q

注释:定时器IN..使能后开始计时,到.达预设.时间PT(1秒).后,.输出Q接通。用它的Q...做成一个“自振荡”电路,就能实现闪烁.

工程师经验:定时.器、.计数器.是PLC的左右护法,几乎.每个项目..用。一定要弄清“使能”和“复.位”的条件,不然经常碰到定时器“卡住”不动。

4

四、走向独立:下一步学什么?

  1. 掌握数..操作
    :比如用“移动”指.令把按钮.次数存到.存储器里。
  2. 玩转函数块
    :把重复.的功能(如电机控制)打.包成自己的“积木块”,方便复用,这是项目结构清.晰的关键。
  3. .尝试通讯
    :P.LC和触摸屏(HMI.)对话..必须.技能,.从西门子自家的精简屏开始,.拖拽配置,不难。
  4. 啃一个真实案..
    :比如一个完.整的.车自动往.返控制系统,涉及启停、限位保护、定时..时,能把..面知识全串.起来。

最后忠告:别只看书...开软件,..上PLC.(或使.用官方.免费的PLC仿真器),哪怕只是让一个.输出点亮灭,那种“掌控”的感觉是.学习最好的动力。出错.是常.态,.利用.好在线监控,逐段排查,你踩的.每一个.坑都是未来简历上的亮.点。

去写你的第.一行梯形图..

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  1. CONNECT:[ UseTime:0.000721s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000787s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.011210s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.007987s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000759s ]
  6. SELECT * FROM `set` [ RunTime:0.001161s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000867s ]
  8. SELECT * FROM `article` WHERE `id` = 472503 LIMIT 1 [ RunTime:0.001771s ]
  9. UPDATE `article` SET `lasttime` = 1770471967 WHERE `id` = 472503 [ RunTime:0.987549s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.012288s ]
  11. SELECT * FROM `article` WHERE `id` < 472503 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.007296s ]
  12. SELECT * FROM `article` WHERE `id` > 472503 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.103161s ]
  13. SELECT * FROM `article` WHERE `id` < 472503 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.395894s ]
  14. SELECT * FROM `article` WHERE `id` < 472503 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.062737s ]
  15. SELECT * FROM `article` WHERE `id` < 472503 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.016664s ]
1.683460s