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更新时间:2018-05-18 23:10:52浏览次数:559次

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经营模式:经销商

商铺产品:113条

所在地区:福建厦门市

联系人:陈工 (销售)

产品简介

3500/61本特利3500/61编程需要敢于实践的信心
我曾经教过一个学生学AutoCAD,我对她的*要求就是实践。我告诉她:你随便怎么操作,大不了一张图重画;Z坏的结果是系统崩溃,没关系,系统重做,再来;只要电脑没被砸了,怎么都行。两年后,我再看到她做的CAD图纸,也自叹不如。
同样道理,只有不断地在PLC上运行这些指令,观察运行的结果,才能弄清PLC指令的作用。很多初学者对PLC一脸的迷茫

详细介绍

3500/61本特利3500/613500/61本特利3500/61

编程需要敢于实践的信心

我曾经教过一个学生学AutoCAD,我对她的*要求就是实践。我告诉她:你随便怎么操作,大不了一张图重画;zui坏的结果是系统崩溃,没关系,系统重做,再来;只要电脑没被砸了,怎么都行。两年后,我再看到她做的CAD图纸,也自叹不如。

同样道理,只有不断地在PLC上运行这些指令,观察运行的结果,才能弄清PLC指令的作用。很多初学者对PLC一脸的迷茫,往往是出于一种畏惧,担心损坏设备。而这些畏惧是没有任何道理的。仔细的阅读手册是非常重要的,但是仅靠读书是成不了一个工程师的。更何况手册上的内容并非面面俱到。我在接触到那些不熟悉的指令时,喜欢单独编一个小程序,让PLC运行。然后逐个修改条件,观察运行的结果(MicroWin为用户提供了非常好的监控手段),反过来再重新理解手册的描述,这样就可以非常直观的理解这些指令的作用和使用方法。不必担心自己写的程序会有什么问题,会影响PLC的正常工作。程序有没有问题,只有让PLC运行了才能发现。而发现问题并解决问题就是对自己能力的提高。撇开硬件操作不谈,单就软件来说,我还真没有遇到过由于软件问题而损坏PLC的事。在这里不必担心继电器电路接错线可能造成的后果。所以,大胆的实践是PLC编程的必由之路。

当然,大胆实践并不是野蛮操作,而是必须遵循必要的规范。还有一个要注意的,在程序未经可靠性证实之前,千万不要挂接负载,以免造成不必要的损失。数字量的输出有LED显示;而模拟量处理可以采用一些硬件或软件模拟手段来解决。


郑娟萍

厦门仲鑫航自动化设备有限公司  

编程需要有缜密的逻辑思维

编程本身就是一种逻辑思维过程。在高级语言中,使用zui多的是if then else、select这些条件判别语句,这就是逻辑中的因果关系。PLC程序就是由这些因果关系组成的:判别条件是否成立,进而决定执行相应的指令。zui初的PLC是用来替代继电器逻辑电路的,所以继承了继电器电路以触点作为触发条件的描述方式。在PLC中,以虚拟触点代替了继电器的金属触点,而继电器电路所表达的逻辑关系还是被完整的保留下来。即使引入了继电器电路难以胜任的数值处理过程,PLC从根本上还是在执行一个个因果关系。所以,理顺对象的各个事件之间的逻辑关系,是编程之前必须精心做好的准备工作。我在接到一项任务后,*件事就是整理出一份逻辑关系图,与用户反复商讨,取得用户的认可,然后才真正进入程序的编写过程。

Steren 200-033 RG6 Quad Shield Coaxial Cable Crimp F Connector (Pack of 100)


GEM Electronics 301-4 2-Piece BNC Crimp Connector (Pack of 37)


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Weltron 44-285-6 RG-6 BNC Male Cable Connector (Pack of 18)


Weltron 44-135 75 Ohm F Plug Terminator (Pack of 15)


Ideal Industries, Inc. IA-3634 RG-6 BNC Plug


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O-Z/Gedney Liquid-Tight 3/8" Fitting 45 Degree


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RACO Liquid-Tight 3/8"  Fitting 45 Degree


T&B Liquid-Tight Fitting 3/4" Straight


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Hubbell Liquid-Tight 3/4" Fitting Straight


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Appleton 3/4" Fitting 90 Degree


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O-Z/Gedney 4Q-938 Liquidtight Connector (Box of 13)


Bryant Electric, Inc. BDS85L Cable Grip 0.85"-1.0"


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Hubbell SR-040 Kellems Grip 0.40"-0.54"


T&B Cable Grip 1/2"


T&B Cable Grip 3/4"


Hubbell 073-03-1201 Kellems Grip 0.32"-0.43"


Hubbell 073-03-1204 Kellems Grip 0.73"-0.97"


Hubbell 1/2F1 Cord Connector


RACO 1 1/2" Liquid-Tight Fitting Straight


MW 3/4" Fitting 45 Degree


Appleton 1/2" Fitting 90 Degree


3/8" Liquid-Tight Fitting 45 Degree


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Appleton 1 1/2" Fitting 90 Degree


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Appleton 1" Fitting Straight


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Appleton 3/4" Liquid-Tight Fitting Straight


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1" Fitting Straight


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T&B 1" Fitting 90 Degree


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Appleton 1 1/4" Fitting Straight


O-Z/Gedney 3/4" Liquid-Tight Fitting Straight


T&B 1 1/4" Liquid-Tight Fitting Straight


Madison IL 110 Armored Cable Connector 3/8"


T&B 1/2" Liquid-Tight Fitting 45 Degree


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Appleton ST-9038 Mall Iron Connector 3/8" (Box of 25)


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Appleton ST-90100 Mall Iron Connector 1" (Box of 7)


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Amphenol 31-71000-RFX Crimp Plug


Bridgeport 412-DC2 Squeeze Connector 1 1/4" (Box of 10)


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Neer EGS LMM-11 Liquidtight Conduit Connector 20-Pack


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ILSCO D1112 Lug AU-0 1/0-14 AL9CU


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1/8 NPT 90 Degree Elbow Male/Female Fitting


Hubbell BSP25 "D" Subminature Connector


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