I am often asked, I want to learn to operate industrial robots, what if I don’t know plc? As a beginner, it is quite common to have such problems. After reading this easy-to-understand article, you will probably understand the absolute relationship between industrial robots and plc. Let us first understand the basic structure and principle of industrial robots. The hardware structure of industrial robots is simply that 3-6 servo drive systems cooperate to perform various actions, and controlling industrial robots is essentially to control that. Several motors are turning, reversing, turning faster or slower. I believe everyone can understand. So those who have learned electrical control understand that in order to control these motors to act according to your meaning, naturally a PLC-like device is needed as a control platform to write programs for you, a human-machine interface similar to a touch screen. Come and give orders. The "PLC" here is the integrated controller of the robot, and the "touch screen" is the teach pendant. In fact, in the entire industrial robot industry, the value of the robot body accounts for about 1/3, so where does the other 2/3 go? This 2/3 is mainly occupied by integrated equipment and industrial software around the robot. As we all know, industrial robots are more and more like a standard part. In order to use industrial robots flexibly according to the actual situation on site, it is necessary to cooperate with peripheral equipment and industrial software. Industrial robots do not work in isolation, and a robot workstation often Need to cooperate with peripheral equipment, such as fixtures, conveyor belts, welding positioners, moving rails, etc., how these roles should cooperate with each other, PLC coordination is required. A production line requires the cooperation of multiple industrial robot workstations, and the production line also includes other relatively independent automation equipment, such as AGV trolleys, automated warehouses, painting equipment, assembly equipment and so on. At this time, the workstation and the workstation need a higher level of PLC to coordinate. The simplest example: A conveyor production line, there are three industrial robot workstations in the three positions A, B, C, representing three stations need to carry out three kinds of process operations, PLC first controls the conveyor belt movement, the workpiece arrives at station A, and the position sensor of station A detects When the workpiece is in place, send a signal to the PLC, the PLC receives the input signal, and at the same time integrates other external signals to judge that the robot of station A can start working at this time, then send a signal to the robot A through the PLC output: 丫 you can I started to work, hurry. After the robot A has finished working, feedback a completion signal to the PLC: Brother, my work is done, you continue. After the PLC accepts this signal, it continues to drive the motor control conveyor to transport the workpiece to station B, repeating the above logic process. Dear readers, after reading the above paragraph, I think your question is at least half resolved. Now when it comes to the conclusion, the application of industrial robots is inseparable from the participation of PLC, and the field that will really make a difference in the industrial robot industry in the future is a personalized industrial robot solution, so learning industrial robot technology will only operate. Use, then you are just an operational mechanic rather than an application engineer! For industrial robot learners who enter new or cross-row, it is best to have a basic theory of electrical automation. If there is no electrical basis, then you must start with basic electrical circuits and PLC programming. The real application of industrial robots is used in production lines (such as automobile assembly production lines, semiconductor wafer handling, etc.), and various robot handling movement trajectories are debugged, and also cooperate with the action requirements of the production line, that is, The PLC is connected for communication, the two sides exchange signals, when the PLC allows the robot to carry, and the robot moves to notify the PLC. Through such interactive communication, the robot can be used as a "one member" of the entire production line, and other institutions on the production line. Complete the entire production task. >>>Communication connection between industrial robot and PLC If we master both the programming of industrial robots and the control technology of PLC, it is very simple to control the robot through PLC. It is only necessary to effectively connect the industrial robot and the PLC and transmit signals to each other. The communication between the industrial robot and the PLC has two kinds of "I/O" connection and communication line connection. The control method is introduced below by using the "I/O" connection between the most commonly used robot and PLC. ▲ Figure 1: PLC and robot system The PLC above uses the Siemens brand, the S7-300 is used as the host computer, the S7-200 is connected to the machine tool via I/O signals; the S7-300 is connected to the S7-200 using the Profibus bus; the S7-300 is connected to the industrial robot using I/O signals. The industrial robot body and the controller are connected by a self-contained communication cable (direct plug). ▲ Figure 2: S7-300 (CPU-313) input and output signals ▲ Figure 3: S7-200 input and output signals (control lathe) ▲ Figure 4: S7-200 input and output signals (control washing machine) We provide quick-turn injection molding by many types of materials, like ABS, PA66, PBT, TPU, TPE, PVC, PE, NYLON 6, PC, silicone, TPE, EPDM, PUR, etc. Special for some plastic parts. Our advantages in internal prototyping, bridge tooling and short-run manufacturing, which can eliminate the costly and time-consuming for customers a lot.
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