Learn and use these, you are also a PLC technical engineer

In addition to the necessary programming skills, some basic skills are required to engage in PLC-related work.

Some of the following knowledge can be obtained through reading, but most of it should be obtained through the accumulation of experience.

When programming a PLC, you must first understand the electrical schematic diagram, and then combine the electrical design to write a suitable program so that the program execution can be optimized.

The circuit knowledge mentioned here is that the low-voltage electrical circuit and PLC input and output circuits are also called secondary circuits. (The primary circuit can be simply understood as the power distribution circuit, and the secondary circuit is the control circuit), not the integrated circuit on the PLC internal board.

Typical circuits are: motor control loop, start-stop circuit, PLC input and output circuit ...

You can understand the principles of these circuits through textbooks, and then analyze the role of each component in the circuit in combination with the actual situation.

There are two jobs that are very useful for mastering the knowledge of circuits, one is distribution, and the other is factory electrical maintenance. The distribution board is mainly used to connect electrical components with wires according to the drawings. In the process of completing this work, you can convert the abstract schematic diagram into an actual circuit and deepen your understanding of circuit knowledge.

If you can see the schematic diagram, the general layout of the electric control cabinet and the general direction of the circuit will appear in your mind. Or in the absence of drawings, it can be judged that the circuit control of the electric control cabinet encountered is inseparable. Then the circuit knowledge is basically mastered.

Distributing is the work that connects the principle with the real thing. Circuit maintenance is familiar with the circuit from another angle.

Circuit faults in the factory can be said to be varied. When a fault occurs, how to determine the fault point through the schematic diagram and give a reasonable solution. It is basically difficult to complete the circuit processing experience without points.

If your basic circuit knowledge is relatively weak, and you feel that you can't apply it to actual work when reading a book, you can pay attention to two jobs, and you can request an internship if you have the opportunity.

The circuit knowledge is relatively easy to master. There are so many commonly used classic circuits. Most of the ones we encounter in our work are still some typical circuits, or special changes in typical circuits.

According to the needs of the work, master the control circuit encountered in one time, no matter whether it is maintenance or programming in the future.

In the process of program debugging, it is indispensable to check whether the various components are good or bad and whether the loop is normal, so the basic electrical skills must still be mastered.

For example, how to use the multimeter, how to use the oscilloscope, how to use the electroscope to confirm personal safety, and the use of tools such as wire strippers and screwdrivers.

There are many video tutorials on the electrician skill knowledge online, you can practice by watching and doing.

Among these skills, the use of multimeters is particularly important. In addition to mastering basic voltage, current, and resistance measurements, you also need to learn how to use multimeters to query fault points and determine whether components are good or bad.

Electrician skills are more dependent on hands-on skills, and are also particularly important in practical work. You must practice more hands-on.

CAD and EPLAN are the current mainstream circuit drawing software. CAD is widely used and is a skill that engineering must master. It is more convenient to exchange drawings drawn with CAD. The disadvantage is that CAD is not flexible enough when drawing circuit diagrams, and simple circuits can cope with it. When the drawing exceeds 100 pages, using CAD will be more tiring and more troublesome to modify.

EPLAN is a professional electrical design software, it was born to draw electrical drawings, covering electrical cabinet design, electrical schematic drawing, hydraulic and pneumatic circuit drawing. Powerful function is its advantage and its disadvantage. It takes a period of intensive practice to master Eplan.

It is recommended that you must master CAD. If you do n’t use Epal at this stage, you can only master the basic functions and understand the drawing principles. Get someone's Eplan drawings, which can be opened and easily modified. In order to further study the basic skills of reserve, people always have to look forward. Perhaps in the near future, you will need to independently complete large projects that must use Eplan.

Everyone who is engaged in electrical related work should learn EPLAN, not just for drawing, but to learn EPLAN in the process of learning EPLAN (the basis of EPLAN is electrical specifications).

Computers are already basic tools for people in the workplace. Engaged in programming work, if you don't know anything about the computer, the future work will only be difficult for you.

At the very least, it is necessary to install the Windows system, install the various programming software needed in the work without error, and the computer is faulty to determine which original is caused.

What kind of effects do the originals such as memory, CPU and hard disk have on the performance of the computer? Can you choose a laptop computer reasonably according to your work needs and as economic capacity allows.

In the future, if you encounter any knowledge of the computer, try to avoid asking other people directly, and try to find the relevant knowledge first to see if you can solve it with your existing capabilities.

In a complete control system, PLC belongs to the original control, and the inverter and servo belong to the execution equipment. Most of the three-phase asynchronous motor drive and speed regulation will be equipped with frequency converters, and servo motors will be selected in the occasions with high control accuracy requirements.

The frequency converter and the servo do not allow you to program, only need to adjust the parameters according to the working situation and cooperate with the PLC.

The parameters of the domestic inverter are relatively clear, and there is not much difference between various manufacturers. The parameters of foreign brands are much more complicated. It is recommended to learn Siemens inverters. Its parameters are really more than one, followed by ABB.

To master the inverter and servo, be sure to start with the application and study the user manual. If there is a teacher by your side, be sure to ask for advice, maybe his one or two sentences can save you half a day.

If you want to master the inverter and the servo, you still need to master their working principles, understand the principle thoroughly, and understand the role of the various parameters in the manual.

In order to improve human-computer interaction, it will be equipped with a touch screen or a host computer according to the size of the project. The touch screen is directly installed on the electrical cabinet and connected to the PLC through a dedicated cable.

The cost-effectiveness of the domestically produced touch screen is relatively high. You can buy a good one for about a thousand yuan. There are brands such as Kunlun Tongtai, Weiluntong, Xinjie and Xiankong. For example, Siemens, Mitsubishi and AB also produce touch screens, but the price is not so close to the people.

The configuration software of the host computer includes Kingview, Zijin Bridge, Force Control, etc., and foreign ones such as WinCC, Intouch, and ifix are also used.

No matter it is a touch screen or a host computer, configuration software is needed. The touch configuration software only needs to be installed on its own computer. The configuration is compiled without errors, and downloaded directly to the touch screen to run.

The configuration software of the host computer is generally divided into two parts: the editing part and the running part.

The functions of the editing part are similar to those of the touch screen configuration software. They are used to configure the process screen and operation interface. The difference is the host computer configuration software, which is much more powerful than the touch screen configuration software.

Although the configuration software is divided into two parts here, it is not to say that there are two softwares. The two parts are only logically distinguished, and may be a software package during actual installation.

The touch screen and configuration software are relatively simple to learn, and do not need to have physical objects. The touch screen configuration software has a simulation function. If it is just for learning the host computer configuration software, you can go directly to the Internet to download the cracked version.

Learning suggestion: Choose a commonly used touch screen to study thoroughly, other brands are used, and it is not too late to learn, touch screen configuration software is similar, and the learning threshold is not high.

The host computer software is recommended to learn WinCC. In addition to the powerful functions of WinCC, the scope of use is also relatively wide. If you master it, you can immediately apply it in your work.