1. What is the difference between the human-machine interface and the "touch screen" that people often say?
Strictly speaking, there is a fundamental difference between the two. Because the "touch screen" is only a hardware part that may be used in human-machine interface products, it is an input device installed at the front end of the display screen to replace the function of the mouse and keyboard; A human-machine interface product is a human-computer interaction device that includes hardware and software. In the industry, people often refer to human-machine interface products with touch input function as "touch screens", but this is unscientific.
2. What is the difference between human-machine interface and configuration software?
Human-machine interface products, often referred to as "touch screen", include HMI hardware and the corresponding special screen configuration software, in general, HMI hardware of different manufacturers use different screen configuration software, and the primary equipment variety is PLC. The configuration software is a general software product that runs in the PC hardware channel and the windows operating system, and can also form HMI products together with the PC or industrial computer; There are many types of equipment supported by the general configuration software, such as various PLCs, PC boards, appearances, inverters, modules and other equipment, and because the hardware channel function of the PC is strong (the primary response is in the speed and storage capacity), the function of the general configuration software is also much stronger, which is suitable for large-scale monitoring systems.
3. Is there an operating system in the HMI product?
Any human-machine interface product has a system software part, and the system software runs in the processor of the HMI to support multitasking functions, and the processor needs to have a small operation system management system software operation. According to the high-performance human-machine interface products of tablet computers, general embedded operating systems such as WinCE and Linux are generally used.
4. Can the human-machine interface only be connected to the PLC?
That's not true. Human-computer interface products are produced to solve the human-computer interaction problem of PLC, but with the development of computer technology and digital circuit technology, many industrial control equipment have serial communication capabilities, so as long as there are industrial control equipment with serial communication capabilities, such as frequency converters, DC governors, temperature control surfaces, data acquisition modules, etc., can be connected to human-computer interface products to complete the human-computer interaction function.
5. Can the human-machine interface only be connected to other devices through the standard serial communication port?
Most of the time it is. However, with the development of computer and digital circuit technology, the interface of human-machine interface products can become stronger and stronger. In addition to the traditional serial (RS232, RS422/RS485) communication interfaces, some human-computer interface products already have network ports, parallel ports, USB ports and other data interfaces, they can be connected with industrial control equipment with network ports, parallel ports, USB ports and other interfaces to complete the human-computer interaction of the equipment.
6. Is there a communication function device that must be able to connect with the human-machine interface product?
That's how it should be. Because general human-machine interface products provide a lot of common device communication drivers that can be selected; In general, as long as the communication driver corresponding to the connecting device is selected in the screen configuration software of the HMI, the communication connection between the HMI and the device can be completed. If there is no communication driver for the device to be connected in the configuration software of the selected HMI product, the user can inform the manufacturer of the HMI product of the type of communication port and the protocol content of the device to be connected, and ask the HMI manufacturer to compile the communication driver for the device on behalf of the user.
7. Can the PC and touch screen communicate directly with the PLC to complete the function of HMI?
Absolutely. However, it is necessary to compile the corresponding HMI software in order to make the PC a real HMI product.
8. What is the development trend of human-machine interface in the future?
With the development of digital circuits and computer technology, the division of high, medium and low functions of human-machine interface products in the future will become less and less obvious, and the functions of HMI will become more and more abundant; HMI products above 5.7 inches will all be color displays, and the screen life will be longer. Because of the decline in the cost of computer hardware, HMI products will be based on tablet PC computers as high-end products of HMI hardware, because this high-end product has great advantages in processor speed, storage capacity, communication interface variety and quantity, networking ability, and software resource sharing, which is the future development direction of HMI products. Of course, small-scale (display scale less than 5.7 inches) HMI products, because of their advantages in volume and price, will be widely used in the human-computer interaction of small mechanical equipment with the further enhancement of their functions (such as increasing IO functions).
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