The small size is the traffic light, which is intuitive and inoperable. Medium-sized presses, lathes and touch screens require high precision. Large power plant fly ash desulfurization system, configuration coordination, or sewage treatment, plus communication, there are many projects, depending on what you want to do. Generally, there are many small and medium-sized Omron and Mitsubishi, and there are many large ones, because they involve the communication between plc and Siemens (also some domestic state-owned enterprises have customers).