Man-machine interface details daquan

HMI is the abbreviation of Man-Machine Interface, also called Man-Machine Interface. Man-machine interface (also known as user interface or user interface) is the medium of interaction and information exchange between the system and users, which realizes the transformation between the internal form of information and the form acceptable to human beings. Man-machine interface exists in all fields involving man-machine information exchange.

Basic introduction Chinese name: Man-machine interface mbth: HMI full name: Man-machine interface nature: the medium for interaction and information exchange between the system and users. This paper introduces HMI, the definition of HMI products, the composition and working principle of HMI products, the types of HMI products, the common sense of products and the definition of HMI products, the composition and working principle of HMI products, the basic functions and selection indicators of HMI products, the classification of HMI products, the use of HMI and product questions and answers. In this paper, HMI is the abbreviation of man-machine interface, "man-machine interface", also known as man-machine interface. Man-machine interface (also known as user interface or user interface) is the medium of interaction and information exchange between the system and users, which realizes the transformation between the internal form of information and the form acceptable to human beings. Man-machine interface exists in all fields involving man-machine information exchange. Man-machine interface products are defined as being connected with industrial control equipment such as programmable controller (PLC), frequency converter, DC governor and instrument. Use the display screen to write working parameters or input operation commands through input units (such as touch screen, keyboard, mouse, etc.). ) to realize the interaction of man-machine information. It consists of hardware and software. Composition and working principle of HMI products HMI products are composed of hardware and software. The hardware part includes processor, display unit, input unit, communication interface, data storage unit and so on. The performance of processor determines the performance of HMI products, and it is the core unit of HMI. According to the different grades of HMI products, the processors can be 8-bit, 16-bit and 32-bit respectively. HMI software is generally divided into two parts, namely system software running on HMI hardware and screen configuration software running on PC Windows operating system (such as JB-HMI screen configuration software). The user must first create an "engineering file" by using HMI's screen configuration software, and then download the compiled "engineering file" to the processor of HMI through the serial communication port between PC and HMI products. Interface types There are many HMI interfaces, including RS232, RS485, CAN and RJ45 cable interfaces. For example, in a factory, we need to collect information about temperature, humidity and the state of machines in the factory. These parameters are monitored and recorded by the main controller, and can be handled when some unexpected situations occur. This is a typical application of SCADA/HMI. Generally speaking, HMI system must have several basic capabilities: real-time data trend display-display the collected data on the screen immediately. Automatically record data-automatically save data in the database for later viewing. Trend display of historical data-visually present the data in the database. Report generation and printing-data can be converted into report format and printed. Graphical interface control-The operator can directly control the machine and other equipment through the graphical interface. Alarm generation and recording-users can define some conditions for alarm generation, such as excessive temperature or pressure exceeding critical value. In this case, the system will give an alarm and inform the operator to handle it. Main manufacturers: HMI products are mainly divided into three categories: touch screen, text terminal and tablet computer, among which touch screen is the representative product. Edek: It mainly provides 4.6-inch to 12. 1 inch touch screens, large, medium and small touch screens, portable CC switch models with excellent operation sense and integrated HMI, which can realize the most ideal HMI environment. The main products are: programmable displays HG4G, HG3G, HG2G, Hg1F; ; Small portable man-machine interfaces HG 1U, HG 1T and Hg1h. △: The main HMI products are 5.7-inch, 7-inch, 8-inch and 10-inch touch screens and some text terminals. Products include DOP expansion module, DOP-A series, DOP-AE series, DOP-AS series and DOP-B series. Booker: We provide a series of products from 3.7 inches to 15 inches, from monochrome to color, from touch screen to text terminal. Mitsubishi electric: Provide 3.7-inch to 15-inch touch screen and a few text terminal products. The main products are: GT 10 series, GT 15 series, gt10 series, GOT-F900, GTWorks2, GOT 1000. Omron: It mainly provides touch screens ranging from 3 inches to 12. 1 inch and some text terminal products. The main products are NT series, NS series and NP series. Siemens: including text terminal (TD series), button panel (PP series), touch screen (TP series), operation panel (OP series) and multi-function panel (MP series), including 5.7-15. 1 inch touch screen and text terminal products. The definition of product common sense man-machine interface product is a digital device that connects programmable controller (PLC), frequency converter, DC governor, instrument and other industrial control devices, displays them on the display screen, writes working parameters or inputs operation commands through input units (such as touch screen, keyboard and mouse), and realizes man-machine information interaction. It consists of hardware and software. Composition and working principle of HMI products HMI products are composed of hardware and software. The hardware part includes processor, display unit, input unit, communication interface, data storage unit and so on. The performance of processor determines the performance of HMI products, and it is the core unit of HMI. According to the different grades of HMI products, the processors can be 8-bit, 16-bit and 32-bit respectively. HMI software is generally divided into two parts, namely system software running on HMI hardware and screen configuration software running on PC Windows operating system (such as JB-HMI screen configuration software). The user must first create an "engineering file" by using HMI's screen configuration software, and then download the compiled "engineering file" to the processor of HMI through the serial communication port between PC and HMI products. Figure 1 Basic functions and selection indicators of human-machine interface hardware constitute the basic functions of human-machine interface products: the display of equipment working status, such as data and text input operations such as indicator lights, buttons, characters, graphs and curves, the printing and output of production formulas, and the recording of equipment production data. Simple logic and numerical operation can connect a variety of industrial control equipment networking selection indicators: display screen size and color. Resolution HMI input mode of processor speed performance: storage capacity of touch screen or thin film keyboard screen. Pay attention to whether the capacity unit marked by the manufacturer is bytes or the type and quantity of bit communication ports. Whether the printing function is supported or not, the HMI of film key input is classified as a man-machine interface product. The display screen size is less than 5.7ˊ, and the screen configuration software is free, which is a primary product. For example, the HMI input by the POP-HMI small man-machine interface touch screen has a display screen size of 5.7 ˊ ~ 12. 1 ˊ, and the screen configuration software is free. It is a high-performance HMI with multiple communication ports based on a tablet computer. The display screen size is larger than 10.4ˊ, and the screen configuration software is charged. It belongs to a high-end product man-machine interface. Select the appropriate HMI product, edit the "engineering file" on PC with screen configuration software, test and save the edited "engineering file", connect the HMI hardware on PC, download the "engineering file" to HMI, and connect HMI with industrial controllers (such as PLC, meters, etc.) to realize human-computer interaction. Question and answer 1. What's the difference between the man-machine interface and the "touch screen" that people often say? Strictly speaking, there are essential differences between the two. Because the "touch screen" is only a hardware part that may be used in human-computer interface products, it is an input device installed in the front of the display screen, not a mouse and keyboard. Man-machine interface product is a kind of man-machine interaction equipment including hardware and software. In the industry, people often refer to the man-machine interface products with touch input function as "touch screen", but this is unscientific. 2. What is the difference between man-machine interface and configuration software? Man-machine interface products, usually called "touch screen", include HMI hardware and corresponding special screen configuration software. Generally, HMI hardware from different manufacturers uses different screen configuration software, and the main equipment connected is PLC. Configuration software is a general tool software product running on PC hardware platform and windows operating system, and it can also be combined with PC or industrial computer to form HMI products. General configuration software supports a variety of devices, such as various PLC, PC board, instruments, frequency converters, modules and other devices. Moreover, due to the powerful performance of PC hardware platform (mainly reflected in speed and storage capacity), the general configuration software has much stronger functions and is suitable for large-scale monitoring systems. 3. Is there an operating system in the man-machine interface product? Any man-machine interface product has system software, which runs in the processor of HMI and supports multi-task processing. The processor needs a small operating system to manage the running of system software. High-performance human-computer interface products based on tablet computers generally adopt general embedded operating systems such as WinCE and Linux. 4. Can the man-machine interface only be connected with PLC? That's not true. Man-machine interface products are produced to solve the man-machine interaction problem of PLC. However, with the development of computer technology and digital circuit technology, many industrial control devices have serial communication capabilities, so as long as industrial control devices with serial communication capabilities, such as frequency converters, DC governors, temperature control instruments, data acquisition modules, etc. , which can be connected with human-computer interface products to realize human-computer interaction. 5. Can the man-machine interface only be connected with other devices through the standard serial communication port? In most cases, it is true. However, with the development of computer and digital circuit technology, the interface ability of man-machine interface products is getting stronger and stronger. In addition to the traditional serial (RS232, RS422/RS485) communication interface, some man-machine interface products already have data interfaces such as network port, parallel port and USB port, so they can be connected with industrial control equipment through interfaces such as network port, parallel port and USB port to realize man-machine interaction of equipment. 6. Is it possible for devices with communication function to connect with human-computer interface products? It should be like this. Because universal man-machine interface products provide a large number of optional universal device communication drivers; In general, as long as the communication driver corresponding to the connected device is selected in the screen configuration software of man-machine interface, the communication connection between 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 communication port type and protocol content of the device to be connected, and ask the HMI manufacturer to write a communication driver for the device. 7. Can a PC communicate with PLC directly without touching the screen to complete the function of HMI? Of course. However, the corresponding HMI software should be compiled to make PC a real HMI product. 8. What is the development trend of man-machine interface in the future? With the development of digital circuit and computer technology, the division of high, medium and low functions of man-machine interface products will become less and less obvious in the future, and the functions of HMI will become more and more abundant. HMI products above 5.7 inches will all be color display screens, with longer screen life. Due to the reduction of computer hardware cost, HMI products will mainly use tablet computers as high-end products of HMI hardware, because this high-end product has great advantages in processor speed, storage capacity, types and quantities of communication interfaces, networking ability, software resource sharing and so on, which is the development direction of HMI products in the future. Of course, HMI products with small size (display screen size less than 5.7 inches) will be widely used in human-computer interaction applications of small mechanical equipment with further enhancement of its functions (such as adding IO functions) due to its advantages in size and price.