I. Cognition of the touch screen
Touch screen (touch screen), also known as the "touch screen", "touch panel", is a touch can receive input signals such as inductive liquid crystal display device, when contacted with the graphic buttons on the screen, the tactile feedback system on the screen can be based on pre-programmed program to drive a variety of connectivity devices, can be used to replace the mechanical buttons panel, and by the LCD screen to create a vivid audio-visual The LCD display creates vivid audio and video effects. As a latest computer input device, touch screen is the most simple, convenient and natural way of human-computer interaction. It gives the multimedia a brand new look, is extremely attractive new multimedia interactive equipment. Mainly used in public information query, leadership office, industrial control, military command, electronic games, ordering songs, multimedia teaching, real estate pre-sale and so on.
II. Basic Knowledge
1. Definition of HMI products
Connect programmable controller (PLC), frequency converter, DC governor, instrumentation and other industrial control equipment, the use of display screen display, through the input unit (such as touch screen, keyboard, mouse, etc.) to write the work parameters or input operating commands, to achieve the human-machine information interaction of digital equipment, composed of two parts: hardware and software. HMI is the abbreviation of English Human-Machine Interface.
2. Human-machine interface (HMI) product composition and working principle
Human-Machine Interface (HMI) products by the hardware and software components, hardware, including processors, display units, input units, communication interfaces, data storage units, etc., of which the performance of the processor determines the performance of the HMI products, is the core unit of the HMI. According to the HMI product level, the processor can be selected 8-bit, 16-bit, 32-bit processor, HMI software is generally divided into two parts, namely, running on the HMI hardware in the system software and running on the PC Windows operating system under the screen configuration software (such as JB-HMI screen configuration software). Users must first use the HMI screen configuration software to create a "project file", and then through the PC and the HMI product serial communication port, the preparation of the "project file" downloaded to the HMI processor to run.
3. Basic functions and selection index of HMI products
Basic functions:
Equipment working status display, such as indicator lights, buttons, text, graphs, curves and so on;
Data, text input operation, printout;
Production recipe storage, equipment production data records;
Simple logic and numerical operations;
Can be connected to a variety of industrial control equipment network.
Selection indicators:
Display size and color, resolution;
Processor speed performance of HMI;
Input method: touch screen or membrane keyboard;
Screen storage capacity, pay attention to the manufacturer to mark the capacity unit is byte (byte), or bit (bit);
The type and number of communication ports, whether to support the printing function.
4. HMI product classification
Membrane key input HMI, display size less than 5.7, screen configuration software is free, is a primary product. Such as POP-HMI small HMI;
Touch screen input HMI, display size 5.7 ~ 12.1, screen configuration software free, is an intermediate product;
Based on the flat PC computer, a variety of communication ports, high-performance HMI, display size greater than 10.1 inches, screen configuration software charges, is a high-end products.
5. The use of human-machine interface
Clearly monitor the task requirements, choose the appropriate HMI products;
Edit the "project file" with the screen configuration software on the PC;
Test and save the edited "project file";
PC connects to the HMI hardware and downloads the "project file" to the HMI;
Connect HMI and industrial controllers (e.g. PLC, meters, etc.) to realize human-computer interaction.
III, the future development trend of human-machine interface
Some machinery industries, such as machine tools, textile machinery and other industries, has been developed in the country for decades, relatively speaking, belongs to a more mature industry, in the long run, these industries also exist in the demand for equipment upgrading. In this upgrading process, it is true that there will be some small, has been the use of relatively low-end products manufacturers were eliminated, but there are also many companies in the process of equipment renewal, the demand will be repositioned to look for those who are able to meet their development plans, to help them improve their own productivity of the equipment suppliers.
In view of this demand, the future of the human-machine interface will change in shape, concepts, applications and other aspects of the change, which will bring about a change in the core technology of industrial control machines. In general, the future development trend of human-machine interface is six modernization: platform embedded, brand nationalization, equipment intelligence, interface fashion, communication network and energy saving and environmental protection.
IIII, the knowledge of the configuration software
Configuration software, a kind of host computer software. Configuration software <= upper computer software. Also known as configuration monitoring software system software. Translated from the English SCADA, that is, data acquisition and monitoring control. It refers to a number of data acquisition and process control of specialized software. They are in the automatic control system to monitor the level of software platforms and development environments, the use of flexible configuration, to provide users with a rapid construction of industrial automatic control system monitoring functions, the general level of software tools. Configuration software has a wide range of applications, can be used in electric power systems, water systems, petroleum, chemical and other fields of data acquisition and monitoring control and process control and many other areas. In the electric power system as well as electrified railway is also known as remote system.
Configuration software in the country is an agreed concept, there is no clear definition, it can be understood as "configuration monitoring software."" Configuration (Configure)" means 'configuration', 'set', 'set' and so on, refers to the user through a simple way similar to 'building blocks' to complete the software functions they need, without the need to write a computer program, that is, the so-called 'configuration'. It is sometimes called "secondary development", and the configuration software is called "secondary development platform"." Monitoring (Supervisory Control)", that is, 'monitoring and control', refers to the computer signals on the automation equipment or process monitoring, control and management.
Configuration for the modular arbitrary combination. General configuration software main features:
(1) continuity and expandability. With the general configuration software development applications, when the scene (including hardware equipment or system structure) or user needs change, do not need to make a lot of modifications to facilitate the completion of the software updates and upgrades.
(2) encapsulation (easy to learn and easy to use), general configuration software can complete the functions are packaged in a user-friendly way, for the user, do not need to master too much of the programming language technology (or even do not need programming technology), can be very good at completing a complex project all the functions required;.
(3) versatility, each user according to the actual situation of the project, the use of general configuration software to provide the underlying equipment (PLC, intelligent instrumentation, intelligent modules, boards, inverters, etc.) of the I / O Driver, open database and screen production tools, you can complete an animation effect, real-time data processing, historical data and curves coexist with multimedia functions and network functions of the project, not subject to the Industry restrictions.