1. Security runs through the entire process
The most important thing is the importance of security. Then, it must be supplemented by the guarantee of technical means. Here, although it is said to be "auxiliary", it cannot be underestimated. It is necessary to know the weight of the word "guarantee"; thus, it is to highlight the importance of "thinking on the mind."
On the basis of in-depth and comprehensive understanding of the control object and control technology, consider the operation safety, do our utmost to solve the accidental factors and unsafe factors in the operation or action process, and compile the process conforming to the process, safe and reliable, conducive to operation and convenient maintenance. control program.
Of course, security issues and institutional improvements are also one aspect.
2. Pre-preparation is a prerequisite
The importance of preparatory work is believed to be known by many friends, including the understanding of control requirements and overall design ideas, and even the relevant knowledge and basic knowledge. See the previous two summaries.
In the same way, many friends will know that the first step is to prepare the work first, followed by the operation of the PLC hardware wiring and software.
Broadly speaking, learning PLC is also a process that accumulates over time, and can also be attributed to “pre-preparation workâ€. This is called precaution, and the opportunity favors those who are prepared.
3. Program structure must be reasonably arranged
A good program, the structure should be clear and reasonable, can facilitate the reading and debugging of the program; when the program is large, or the control is more complicated, attention should be paid to the application of design methods and programming skills.
"Program architecture is very important", which means that the application of the subroutine not only reduces the program capacity, but also increases the readability, which facilitates the debugging and modification of the program.
Usually when practicing programming or programming small programs, if you have time, you can do this training, such as using different programs and different ideas to compare, to broaden your thinking and gain experience.
4. Program debugging is part
The programmed program must be debugged to detect errors and improve functionality. The debugging is divided into analog debugging (simulating the actual situation) and on-site debugging; only the program approved by the on-site debugging operation is the available program.
In addition, the considerations for debugging must be comprehensive, as far as possible to list enough situations, including misuse, poor components, and sudden power failure, and pay attention to the cooperation between PLC and peripheral circuits.
The PLC is an integral part of the control system and must be considered throughout the system.
5. Learning and accumulating in peacetime
Some knowledge and experience need to rely on the usual accumulation, which is the actual experience of many friends. And PLC programming itself, especially the basic application of small PLC, generally feels not difficult.
Like some people who have used Mitsubishi FX2N, Siemens 200 and Panasonic FP0, it is easy to get started with basic instructions. For functional instructions, you can handle most programming needs by checking manuals and conducting simple tests. But for medium-sized PLCs, more knowledge is needed.
There are also some people who have emphasized the necessity of hands-on. "In the middle school, doing it in school, it is so effective that it is repeated." "It feels that it is necessary to actually learn to learn quickly, and forget it if you don't do it." Also use the existing conditions to learn.
In fact, in the maintenance, you can also gain a lot of experience, such as good methods and deficiencies of others, including the function of the program and the design of the circuit, which can be used in future designs.
6. Conclusion
This article is a general direction, grasping this general direction, for beginners, you can begin to familiarize with the instructions and conduct programming experiments.
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