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NTST01模块全新现货库存
  • NTST01模块全新现货库存
  • NTST01模块全新现货库存
  • NTST01模块全新现货库存
  • NTST01模块全新现货库存
  • NTST01模块全新现货库存

NTST01模块全新现货库存

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全新 | 保修180天

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1.安全贯穿于整个过程

  安全问题,重要的是思想上的重视;然后,还要辅之以技术手段的保证。这里,虽言之以“辅”,却不可轻视,须知“保证”二字的份量;如此而说,是为了突出“思想上重视”的重要性。

  在对控制对象及控制工艺进行深入全面了解的基础上,考虑操作安全,尽大努力解决操作或动作过程中的偶然因素和不安全因素,编制出符合工艺,安全可靠,利于操作,方便维修的控制程序。

  当然,安全问题,制度上的完善也是一个方面。

2.先期准备工作是前提

  先期准备工作的重要性,相信有多位朋友都知道,包括对控制要求的了解和整体设计思路、甚至于相关知识和基础知识的掌握,可参见前面的两个小结。

  同样地,许多朋友都会晓得,首先要先期准备工作,其次是掌握PLC硬件接线和软件的操作使用。

  而广义地说,学习PLC也是一个日积月累的过程,也可以归结到“先期准备工作”中。这叫未雨绸缪,机遇偏爱有所准备的人。

 

3.程序结构须合理安排

  好的程序,结构应清晰合理,能够便于程序的阅读和调试;当程序量较大,或控制较为复杂时,须注意设计方法和编程技巧的应用。

  “程序架构很重要”,这就是说子程序的应用,不仅减少了程序容量,还增加了可读性,方便了程序的调试修改。

  平常在练习编程或编制小的程序时,如果有时间,就可以做这方面的训练,比如采用不同的方案、不同的思路进行比对,以开阔思路和取得经验。

4.程序调试是组成部分

  编制的程序,必须经过调试,以发现错误、完善功能。调试分为模拟调试(模仿实际情况)和现场调试;只有经过现场调试运行认可的程序,才是可用的程序。

  另外,调试时的考虑必须全面,尽可能列出足够多的情况,包括误操作、元器件不良、以及突然断电等,并注意PLC与外围电路的配合。

  PLC是控制系统的一个组成部分,所以必须置于整个系统中考虑。

5.在平时的学习和积累

  一些知识和经验,需依靠平时的积累,这是许多朋友的实际体验。而PLC编程本身,特别是小型PLC的基本应用,一般均感觉不难。

  像一些人用过三菱FX2N、西门子200和松下FP0,感觉基本指令上手很容易;对功能指令,通过查手册和进行简单的试验,也能够应对大多数的编程需要。但中型PLC,用到的知识要多一些。

  还有一些经验的人强调了动手的必要性,“在干中学,在学中干,如此反复收效颇丰”;“感觉还是要实际操作学习快,不干就忘了”。还要利用已有条件进行学习。

  其实在维修中,也可以取得许多经验,比如他人好的方法和不足之处,包括程序的功能和电路的设计,这些都可以用于今后的设计中。

 

6.结语

  本文所谈是一个大方向,把握了这个大方向,对于入门者来说,就可开始熟悉指令和进行编程试验了。
NTST01模块全新现货库存 NTST01模块全新现货库存 NTST01模块全新现货库存
1. Safety runs through the whole process
The most important thing about safety is to pay attention to it ideologically; Then, it should be supplemented by the guarantee of technical means. Here, although it is said to be "auxiliary", it can not be underestimated. It should be noted that the weight of the word "guarantee"; This is to highlight the importance of "ideological attention".
On the basis of in-depth and comprehensive understanding of the control object and control process, considering the operation safety, try our best to solve the accidental and unsafe factors in the operation or action process, and prepare the control program that is in line with the process, safe and reliable, conducive to operation and convenient maintenance.
Of course, the improvement of security system is also an aspect.
2. Advance preparation is the premise
I believe many friends know the importance of early preparation, including the understanding of control requirements and overall design ideas, and even the mastery of relevant knowledge and basic knowledge. Please refer to the previous two summaries.
Similarly, many friends will know that the first thing is to prepare in advance, and the second is to master the operation and use of PLC hardware wiring and software.
Broadly speaking, learning PLC is also a cumulative process, which can also be attributed to "early preparation". This is called planning ahead. Opportunities prefer those who are prepared.
3. The procedure structure must be arranged reasonably
The structure of a good program should be clear and reasonable, which can facilitate the reading and debugging of the program; When the amount of programs is large or the control is complex, attention must be paid to the application of design methods and programming skills.
"Program architecture is very important", that is to say, the application of subroutines not only reduces the program capacity, but also increases the readability and facilitates the debugging and modification of the program.
When practicing programming or compiling small programs, if you have time, you can do this training, such as comparing different schemes and ideas, so as to broaden your ideas and gain experience.
4. Program debugging is an integral part
The program must be debugged to find errors and improve functions. Debugging is divided into simulation debugging (imitating the actual situation) and on-site debugging; Only the procedures approved by on-site commissioning and operation are available.
In addition, the consideration during commissioning must be comprehensive, and enough conditions must be listed as far as possible, including misoperation, poor components, sudden power failure, etc., and pay attention to the cooperation between PLC and peripheral circuits.
PLC is an integral part of the control system, so it must be considered in the whole system.
5. Learning and accumulation in peacetime
Some knowledge and experience need to be accumulated at ordinary times, which is the actual experience of many friends. PLC programming itself, especially the basic application of Small PLC, is generally not difficult.
For example, some people have used Mitsubishi FX2N, Siemens 200 and Panasonic FP0, and feel that the basic instructions are easy to use; For functional instructions, most programming needs can also be met by checking the manual and conducting simple tests. But medium-sized PLC uses more knowledge.
Some experienced people emphasized the necessity of hands-on, "learning by doing and doing by learning, so repeated and fruitful"; "I feel that I still need to practice and learn quickly. If I don't do it, I'll forget it.". We should also use the existing conditions to learn.
In fact, many experiences can be gained in maintenance, such as good methods and shortcomings of others, including program function and circuit design, which can be used in future design.
6. Conclusion
This article talks about a general direction. If you grasp this general direction, you can start to be familiar with instructions and programming experiments for beginners.


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