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HMI is the abbreviation of Machine Interface Human, "man-machine interface", also called the man-machine interface. Man machine interface (also called user interface or user interface) is the medium of interaction and information exchange between system and user. It realizes the conversion between the internal form of information and the acceptable form of human being. Where there is a man-machine interface in the field of human computer information exchange.
HMI many types of interface, there are RS232, RS485, RJ45 network cable interface.
HMI man-machine interface common sense
Definition
1, man-machine interface products connected with a programmable controller (PLC), frequency converter, DC governor, instruments and other industrial control equipment, the display, the input unit (such as a touch screen, keyboard, mouse) write parameters or input operation command, digital equipment to realize human and machine interactive information, consisting of the two part of hardware and software.
2, human machine interface (HMI) product composition and working principle
The man-machine interface products by the hardware and software of two parts, the hardware part includes a processor, a display unit, an input unit, communication interface, data storage unit, wherein the processor performance determines the performance of HMI products, is the core element of HMI. According to HMI product level is different, the processor can be used 8, 16, 32 bit processor. HMI software is generally divided into two parts, that is, running in the HMI hardware system software and running in the Windows PC operating system under the screen configuration software (such as HMI - JB screen configuration software). Users must first use the HMI screen configuration software production "project file", and then through the PC machine and HMI serial communication port, the preparation of a good "project file" to download to the HMI processor.
3, the basic function of the man-machine interface products and selection index
Basic function:
Equipment operating status display, such as the indicator light, buttons, text, graphics, curves, etc.
Data, text input operation, print output
Production formula storage, equipment production data records
Simple logic and numerical operation
Can connect a variety of industrial control equipment networking
Selection index:
Display size and color, resolution
Processor speed performance of HMI
Input mode: touch screen or thin film keyboard
Picture storage capacity, pay attention to the capacity of the unit is marked by the size of the unit (byte), or bit (bit)
Type and quantity of communication port, whether to support printing function
4, man-machine interface product classification
Film key input HMI display size is less than 5.7 ', the screen configuration software for free, is the primary product. Such as the POP HMI touch screen input small man-machine interface HMI, the screen size is 5.7 'to 12.1' screen configuration, free software, an intermediate product
A variety of high performance computer, tablet PC communication port, based on HMI, the display size is greater than 10.4 ', the picture is a high-end product configuration software charges.
5, man-machine interface using method
Clearly monitor the task requirements, select the appropriate HMI products
Edit the project file with the picture configuration software on the PC machine"
Test and save the edited "project file"
PC machine connected to the HMI hardware, download "project file" to HMI
Connecting HMI and industrial controller (such as PLC, instrument, etc.), to achieve human-computer interaction
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