What is HMI?
Today we are about what is human-computer interface HMI? What are the functions and classifications of HMI?
HMI is the acronym of Human Machine Interface in English. It means “human-machine interface” or “human-machine interface” in Chinese. It is mostly used in China. HMI is “the medium and dialogue interface for transmitting and exchanging information between humans and machines”. It can be simply understood as a micro computer with a appearance similar to a tablet computer, such as an iPad of Apple, but it has many sockets, such as a desktop computer on a traditional desk (called a PC computer later), with a USB interface, a network cable interface, and a serial interface. Usually, HMI is embedded in the machine like a building block, usually an automated large machine. The operation of the machine is controlled and monitored through HMI. You can understand that HMI is a computer, which controls the printer to print things.
What does HMI human-machine interface include
The human-computer interface product consists of two parts: hardware and software. The hardware part includes a processor, display unit, input unit, communication interface, data storage unit, etc. The performance of the processor determines the performance of the HMI product and is the core unit of HMI.
Depending on the product level of HMI, the processor can choose 8-bit, 16-bit and 32-bit processors respectively. HMI software is generally divided into two parts, namely the system software running in HMI hardware and the screen configuration software running under the Windows operating system of the PC. Users must first use HMI’s screen configuration software to create “engineering files”, and then download the compiled “engineering files” to the HMI processor through the serial communication ports of the PC and HMI products.
In terms of HMI hardware, like a PC, there are five major modules: processor (such as CPU), display unit (such as monitor), input unit (such as mouse, keyboard), communication interface (such as network card), and data storage unit (such as hard disk). Which aspect does a high-quality HMI hardware mainly look at? It is a processor. The processor has 8-bit, 16-bit, and 32-bit. The higher the number, the stronger the processing power. Next, let’s take a look at the interfaces around the hardware. HMI can connect to many types of devices, such as programmable controllers (PLCs for short), frequency converters, DC speed regulators, instruments and industrial equipment, etc. They are connected to the serial port interface of HMI. The types of serial ports include RS232, RS485, etc.
The classification of HMI can be roughly divided into three types:
1. The HMI inputted by the film key has a display size of less than 5.7ˊ, and the screen configuration software is free, and it is a primary product.
2. The HMI inputted by the touch screen has a display size of 5.7ˊ~12.1ˊ, and the screen configuration software is free, and it is an intermediate product.
3. High-performance HMI based on tablet PC computers, multiple communication ports, with display size greater than 10.4ˊ, and screen configuration software charges, making it a high-end product.
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