1. The basic functions and selection indicators of human-machine interface products
Basic Functions:
Display of equipment working status, such as indicator lights, buttons, text, graphics, curves, etc.;
Data and text input operations, printouts;
Production recipe storage, equipment production data recording;
simple logical and numerical operations;
It can be connected to a variety of industrial control equipment networking.
Selection indicators:
Display size and color, resolution;
processor speed performance of HMI;
Input:
touch screen or membrane keypad;
Screen storage capacity, pay attention to whether the capacity unit marked by the manufacturer is bytes or bits;
The type and number of communication ports, and whether they support the printing function.
2. Classification of human-machine interface
Membrane key input HMI: display size less than 5.7', screen configuration software is free, is a primary product. Such as POP - HMI small human-machine interface;
HMI for touch screen input: the display size is 5.7'-12.1', the screen configuration software is free, and it is an intermediate product;
High-performance HMI based on tablet PC computer, multiple communication ports: display size greater than 10.4', screen configuration software charges, is a high-end product.
3. 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 of the display screen to replace some functions of the mouse and keyboard.
A human-machine interface product is a human-computer interaction device that includes hardware and software. In industry, people often refer to human-machine interface products with touch input function as "touch screens", but this is unscientific.
4. 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 corresponding special screen configuration software, in general, HMI hardware of different manufacturers use different screen configuration software, and the main type of equipment connected is PLC.
Configuration software is a general tool software product running on the PC hardware platform and windows operating system, and can also be composed of HMI products together with PC or industrial computer; There are many types of equipment supported by the general configuration software, such as various PLCs, PC boards, instruments, inverters, modules and other equipment, and because of the powerful performance of the PC hardware platform (mainly reflected in the speed and storage capacity), the functions of the general configuration software are also much stronger, which is suitable for large-scale monitoring systems.
5. Is there an operating system in the HMI product?
Any human-machine interface product has a system software part, the system software runs in the processor of the HMI, supports multitasking functions, and the processor needs to have a small operating system to manage the operation of the management system software. Among the high-performance HMI products based on tablet computers, general-purpose embedded operating systems such as WinCE and Linux are generally used.
6. 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 port communication capabilities, so as long as there are industrial control equipment with serial port communication capabilities, such as frequency converters, DC governors, temperature control instruments, data acquisition modules, etc., can be connected to human-computer interface products to realize human-computer interaction functions.
7. 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 capability of human-machine interface products is getting stronger and stronger. In addition to the traditional serial (RS232, RS422/RS485) communication interfaces, some human-computer interface products have network ports, parallel ports, USB ports and other data interfaces, which can be connected with industrial control equipment with network ports, parallel ports, USB ports and other interfaces to realize the human-computer interaction of the equipment.
8. Is there a communication function of the device 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 large number of common device communication drivers to choose from; In general, as long as the communication driver corresponding to the connected 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 communication port type and 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.
9. Can the PC machine and display screen communicate directly with the PLC to complete the function of HMI?
Of course. However, the PC also needs to program the corresponding configuration software in order to make the PC a real HMI product.
10. What is the future development trend of human-machine interface?
With the development of digital circuits and computer technology, the high, medium and low division 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.
Due to the reduction of computer hardware costs, 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 type and quantity, networking ability, and software resource sharing, which is the development direction of HMI products in the future. Of course, small size (display size less than 5.7 inches) HMI products, due to their advantages in size and price, will be widely used in human-computer interaction applications of small mechanical equipment with the further enhancement of their functions (such as adding IO functions).
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