tft LCD manufacturerA brief analysis of what ishmi human-machine interface productsIt is well known that the human-machine interface is different from what people often call "touch screen"? Strictly speaking, there is a fundamental difference between the two. Because "touch screen" is only the possible use of the hardware part of the human-machine interface products, is an alternative to the mouse and keyboard part of the function, installed in the front of the display input device, and the human-machine interface product is a human-machine interaction device containing hardware and software. In industry, human-machine interface products with touch input are often referred to as "touch screens", but this is not scientific. Touch screen is people's "with touch function human-machine interface" popular name! The real touch screen is "a transparent glass that can be operated by hand touch" just! Can be used instead of the mouse. Modify the human-machine interface related knowledge, what is the human-machine interface human-machine interface (HMI) basic concepts and problems!

First, human-machine interface (HMI) product basic common sense

1. Definition of human-machine interface products

Connect programmable controller (PLC), inverter, DC governor, instrument and other industrial control equipment, using the display display, through the input unit (such as touch screen, keyboard, mouse, etc.) to write the operating parameters or input operation commands, to achieve human-machine information interaction of digital equipment, composed of hardware and software. HMI is an abbreviation for Human-Machine Interface.

2. The composition of the human-machine interface (HMI) products and the principle of operation of the human-machine interface products consist of hardware and software, the hardware part includes the processor, display unit, input unit, communication interface, data storage unit, etc., wherein the performance of the processor determines the performance of HMI products, is the core unit of HMI. Depending on HMI's product grade, processors can be selected for 8-bit, 16-bit, 32-bit processors. HMI software is generally divided into two parts, that is, the system software running in the HMI hardware and the screen configuration software running under the PC Windows operating system (such as JB-HMI screen configuration software). Users must first use HMI's screen configuration software to make "engineering files", and then through the PC and HMI product serial communication port, the prepared "engineering files" downloaded to the HMI processor to run. Figure 1 human machine interface hardware composition Figure 2 human machine interface software composition

3. Basic functions and selection indicators of human-machine interface products

Basic functions: the operating status of the device display, such as indicators, buttons, text, graphics, curves, etc.

Data, text input operations, printout;

Production formula storage, equipment production data records;

Simple logic and numerical operations;

A network of industrial control equipment can be connected.

Selection indicators: display size and color, resolution;

THE PROCESSOR SPEED PERFORMANCE OF HMI;

Input mode: touch screen or film keyboard;

Screen storage capacity, pay attention to the manufacturer labeled the capacity unit is byte (byte), or bit (bit);

The type and number of communication ports, whether the printing function is supported.

4. The human-machine interface product classification film key input HMI, display size is less than 5.7 , screen configuration software is free, is a primary product. Such as POP-HMI small human-machine interface;

Touch screen input OF HMI, display size of 5.7 to 12.1, screen configuration software free, is an intermediate product;

Based on the tablet PC computer, a variety of communication ports, high-performance HMI, display size is greater than 10.4 , screen configuration software charges, is a high-end products.

5. The use of human-machine interface clearly monitors the task requirements, selects the appropriate HMI products;

Edit the "engineering file" with the screen configuration software on the PC;

Test and save edited "engineering files";

The PC connects to the HMI hardware and downloads the "engineering file" into the HMI;

Connect HMI and industrial controllers (e.g. PLC, meter, etc.) for human-computer interaction.

Second, human-machine interface product question and answer

1, the human-machine interface and people often say "touch screen" what difference? Strictly speaking, there is a fundamental difference between the two. Because "touch screen" is only the possible use of the hardware part of the human-machine interface products, is an alternative to the mouse and keyboard part of the function, installed in the front of the display input device, and the human-machine interface product is a human-machine interaction device containing hardware and software. In industry, human-machine interface products with touch input are often referred to as "touch screens", but this is not scientific.

2. What is the difference between the human-machine interface and the configuration software? Human-machine interface products, often referred to as "touch screen", including HMI hardware and the corresponding dedicated screen configuration software, in general, different manufacturers of HMI hardware use different screen configuration software, the main type of equipment connected is PLC. The configuration software is run on the PC hardware platform, windows operating system under a common tool software products, and PC or industrial control machine can also form HMI products;

3, human-machine interface products are there an operating system? Any person machine interface products have a system software part, the system software runs in the HMI processor, supportmulti-tasking function, the processor needs to have a small operating system management system software operation. High-performance human-machine interface products based on flat-panel computers are generally used in General embedded operating systems such as WinCE and Linux.

4, human-machine interface can only connect PLC? That's not true. Human-machine interface products are to solve the problem of human-machine interaction in PLC, but with the development of computer technology and digital circuit technology, many industrial control equipment has serial communication capacity, so as long as there is serial communication capacity of industrial control equipment, such as inverters, DC governor, thermostat, digital instruments, etc. can be connected to human-machine interface products, to achieve human-machine interaction functions.

It should be like this. Because the universal human-machine interface products have a large number of commonequipment communication drivers to choose from, in general, as long as the human-machine interface screen configuration software to select the corresponding communication drivers with the connected device, you can complete the HMI and the device communication connection. If there is no communication driver to connect to the device in the configuration software of the selected HMI product, the user can inform the manufacturer of the communication port type and protocol of the device to be connected to, and ask the HMI manufacturer to prepare the communication driver for the device on its behalf.

5, PC plus touch screen, can direct communication with PLC, complete the function of HMI? Of course. However, the corresponding HMI software must be developed to make the PC a real HMI product.

6, the future development trend of human-machine interface? With the development of digital circuit and computer technology, the future of human-machine interface products in the function of high, medium and low division will be less and less obvious, HMI functionwill will be more and more rich; Due to the reduction of computer hardware costs, HMI products will be flat-panel PC computer for THE high-end products of HMI hardware, because this high-end product in the processor speed, storage capacity, communication interface types and quantities, networking capacity, software resource sharing have a greater advantage, is the future direction of the development of HMI products.