The common sense of human-machine interface is the first knowledge for beginners. The product consists of hardware and software. The hardware part includes processor, display unit, input unit, communication interface and data storage unit. The HMI software is generally divided into two parts, namely, the system software running in the HMI hardware and the screen configuration software running on the PC operating system of the PC. The following is a brief introduction to the 10 common senses of the human-machine interface.
1. Basic functions and selection indicators of human-machine interface products
basic skills:
Device working status display, such as indicators, buttons, text, graphics, curves, etc.;
Data, text input operation, printout;
Production recipe storage, equipment production data record;
Simple logic and numerical operations;
Connect a variety of industrial control equipment networking.
Selection indicator:
Display size and color, resolution;
HMI processor speed performance;
Input:
Touch screen or membrane keyboard;
Screen storage capacity, note that the unit of capacity indicated by the manufacturer is byte (byte) or bit (bit);
Whether the type and number of communication ports support printing.
2. Classification of man-machine interface
The HMI of the membrane key input: the display size is less than 5.7', and the screen configuration software is free, which is a primary product. Such as POP-HMI small human machine interface;
HMI input on the touch screen: The display size is 5.7'~12.1', and the screen configuration software is free, which is an intermediate product;
High-performance HMI based on tablet PC computer with multiple communication ports: display size is larger than 10.4', and the screen configuration software charges, which is a high-end product.
3, the difference between the human-machine interface and the often said "touch screen"
Strictly speaking, there is a fundamental difference between the two. Because the “touch screen†is only the hardware part that may be used in the human interface product, it is an input device that is installed at the front end of the display instead of the mouse and keyboard functions.
The human 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 screen", but this is unscientific.
4, the difference between man-machine interface and configuration software
Man-machine interface products, often referred to as "touch screen", contain HMI hardware and corresponding dedicated screen configuration software. Under normal circumstances, different manufacturers' HMI hardware uses different screen configuration software, and the main equipment type connected is PLC. .
The configuration software is a general-purpose tool software product running on the PC hardware platform and the Windows operating system. It can also form an HMI product together with a PC or an industrial computer. The general configuration software supports a wide variety of devices, such as various PLCs. , PC boards, instruments, inverters, modules and other equipment, and because of the powerful performance of the PC hardware platform (mainly in the speed and storage capacity), the general configuration software is also much more powerful, suitable for large-scale monitoring systems in.
5. Is there an operating system in the human-machine interface product?
Any human interface product has a system software part. The system software runs in the HMI processor and supports multi-tasking. The processor needs to run a small operating system management system software. In the high-performance human-machine interface products based on tablet computers, general-purpose embedded operating systems such as WinCE and Linux are generally used.
6. Can the man-machine interface only be connected to the PLC?
not like this. Human-machine interface products are produced to solve the human-computer interaction problem of PLC. However, with the development of computer technology and digital circuit technology, many industrial control devices have serial communication capabilities, so industrial control equipment with serial communication capability is only needed. For example, inverters, DC governors, temperature control instruments, and digital acquisition modules can be connected to human-machine interface products to realize human-computer interaction functions.
7, man-machine interface can only pass the standard serial communication port
Is it connected to other devices?
This is the case in most cases. However, with the development of computer and digital circuit technology, the interface capability of human-machine interface products is getting stronger and stronger. In addition to the traditional serial (RS232, RS422/RS485) communication interface, some human-machine interface products already have data interfaces such as network port, parallel port and USB port, which can be used in industries with interfaces such as network port, parallel port and USB port. Control devices are connected to implement human-machine interaction of the devices.
8, whether there is a communication function of the equipment will be able to
Connected to the HMI product?
It should be like this. Because the universal human-machine interface products provide a large number of common device communication drivers to be selected; in general, as long as the communication driver corresponding to the connected device is selected in the screen configuration software of the human-machine interface, The communication connection between the HMI and the device can be completed.
If there is no communication driver to connect the device 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 protocol to be connected to the device, and ask the HMI manufacturer to compile the communication driver of the device. program.
9, PC plus display, can communicate directly with the PLC,
Complete the function of HMI?
of course can. However, the PC must also compile the corresponding configuration software to make the PC a true HMI product.
10. What is the future development trend of human-machine interface?
With the development of digital circuits and computer technology, the future high, medium and low division of human-machine interface products will become less and less obvious, and the functions of HMI will become more and more abundant; HMI products of 5.7 inches or more All will be color displays and the life of the screen will be longer.
Due to the reduction in computer hardware costs, HMI products will be based on tablet PCs as high-end products for HMI hardware, because of the high-end products in terms of processor speed, storage capacity, type and number of communication interfaces, networking capabilities, and software resource sharing. Both have great advantages and are the development direction of future HMI products. Of course, small-sized (display size less than 5.7-inch) HMI products, due to their advantages in size and price, with the further enhancement of their functions (such as increased IO function), human-computer interaction in small mechanical devices Widely used in applications.
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