PLC programmable logic controller, which uses a type of programmable memory for its internal storage program, executes logic-oriented operations, sequence control, timing, counting and arithmetic operations and other user-oriented instructions, and through digital or analog input / The output controls various types of machinery or production processes.
Why study PLC?
The use of industrial robots is a complex system engineering. A robotic workstation requires the cooperation of peripheral equipment in addition to the body, such as tooling fixtures, conveyor belts, welding positioners, moving rails, etc. How do these roles cooperate with each other, need PLC For coordination, a device similar to PLC is required as a control platform to write programs for you, and a man-machine interface similar to a touch screen is used to issue orders.
â–² PLC controls the coordination of all stations of the entire production line
A conveyor production line, assuming that there are three industrial robot workstations in the three positions of A, B, and C, representing three stations that need to perform three process operations. The PLC first controls the conveyor belt movement, the workpiece reaches station A, and the position sensor of station A Detecting that the workpiece is in place, sending a signal to the PLC, the PLC receives this input signal, and at the same time integrates some other external signals to determine that the robot at the station A can start working at this time, then sends a signal to the robot A through the PLC output: Ya you You can start working, hurry up. After the robot A finishes his work, he feeds back a completion signal to the PLC: Brother, my work is finished, you continue. After receiving this signal, the PLC continues to start the motor control conveyor to transport the workpiece to station B, and repeats the above logic process.
Unlike robots, PLC automation has a wide range of applications. From high-speed rail, subway and other important transportation vehicles, to home appliance switches, as long as you write a program in advance, you can achieve the effect of allowing the machine to run on time automatically, and ensure benefits.
The biggest difference between industrial robots and PLCs is that robots often do standardized production. Large batches and repeated tedious work are the strengths of industrial robots, such as gluing, handling, welding and so on.
PLC automation is a non-standardized production, the scope of application is relatively extensive, and it is very practical in Chinese enterprises. Judging from the current situation of most Chinese enterprises, PLC technology engineering has settled in most Chinese enterprises. At the same time, due to the close connection between industrial robots and PLCs, the connection between industrial robots and PLCs will only increase The closer!
So, how to learn PLC well, here are five suggestions for beginners:
1. Develop a good interest
Since they are not interested in PLC programming, how can they learn well. So you can think of programming as a fun intellectual game, which will encourage you to have enough perseverance and patience to complete programming.
2. PLC learning focuses on practice, and the theory + practical operation effect is good
When programming, PLC and related hardware equipment are required as the practice object, so that the relationship between the program and the actual equipment operation situation can be intuitively reflected when the program is detected, so that the failure point can be easily found when the equipment operation is wrong. It is difficult to analyze the control object and the fault point, and it is difficult to judge the correctness of the written program.
3. Develop a good habit of programming
When writing a slightly more complex project, we need to analyze the process of the project-that is, draw a flowchart
When writing a program, the intermediate relays used must have a sequence and rules, otherwise it will be very disordered during programming, and it will be troublesome in future program modification. At the same time, in the process of writing the program, mark the function and intention of each step and each signal, so that you know the intention of each step of your programming, and you can see it at a glance when you look back at the program.
4. Frequently communicate with peers
PLC is widely used and its control functions are ever-changing. Communication with peers can promote the expansion of knowledge, and can reflect its own deficiencies in the communication process. At the same time, when you encounter a problem, communication is particularly important. The technology that you do n’t understand may be very simple and can be solved by someone with a little hint.
5. The best way to learn is to participate in training, followed by self-study through the Internet
You can understand related technologies through the network, so that you can understand all kinds of technologies, so that you can learn in a targeted manner when you use them in the future.
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