Human Machine Interface HMI seven knowledge you know? Here we come together to learn:
1. HMI can only be connected to PLC?
Not so. HMI products are designed to solve the PLC human-computer interaction problems arising, but with the development of computer technology and digital circuit technology, a lot of industrial control equipment are equipped with serial communication capabilities, so as long as there is a serial communication capabilities of industrial control equipment, such as frequency converters, DC speed controllers, temperature control instrumentation, digital acquisition module, etc. can be connected to the HMI products to achieve the function of human-computer interaction.
2. What is the difference between HMI and what is often called "touch screen"?
Strictly speaking, the two are fundamentally different. Because the "touch screen" is only the hardware part that may be used in the human-machine interface products, it is an alternative to the mouse and keyboard part of the function, installed in the front of the display of the input device; while the human-machine interface products are a kind of human-computer interaction equipment that contains hardware and software. In the industry, people often have touch input function of human-machine interface products called "touch screen", but this is not scientific.
3. 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, support multi-tasking function, the processor needs to have a small operating system to manage the operation of the system software.
4. What is the difference between HMI and configuration software?
HMI products, often referred to as "touch screen", including HMI hardware and the corresponding special screen configuration software, in general, different manufacturers of HMI hardware to use different screen configuration software, connected to the main equipment type is PLC. The configuration software is running on PC hardware platform, windows operating system under a general tool software products.
5. Whether there is a communication function of the device must be able to connect with the HMI products?
It should be so. Because common HMI products provide a large number of commonly used device communication drivers for selection.
6. Can a PC with touch screen communicate directly with PLC to fulfill the function of HMI?
Of course. However, we also need to prepare the corresponding HMI software in order to make the PC become a real HMI product.
7. HMI can only be connected to other devices through the standard serial communication port?
In most cases this is the case. But with the development of computer and digital circuit technology, HMI products interface capabilities are increasingly strong to realize the interaction of the equipment man-machine.
The above is the human-machine interface HMI seven knowledge, in this era of rapid development of science and technology, we still have to keep up with the trend of society, only to continue to learn new knowledge to enrich themselves.