As an industrial controller, do you know the difference between the human-computer interface and the "touch screen"?
HMI software is generally divided into two parts, namely system software running in HMI hardware and screen configuration software running in PC Windows operating system.
Strictly speaking, there are essential differences between the two.Because "touch screen" is only the hardware part that may be used in the man-machine interface products, it is an input device installed in the front end of the display screen to replace some functions of the mouse and keyboard.And the man-machine interface product is a kind of human-machine interaction equipment which includes hardware and software.In industry, the man-machine interface product with touch input function is often called "touch screen", but this is not scientific.
What is the difference between the HMI and the configuration software?
Man-machine interface product, often known as "touch screen", contains HMI hardware and corresponding dedicated screen configuration software. Generally, HMI hardware of different manufacturers USES different screen configuration software, and the main type of connected equipment is PLC.Configuration software is a general tool software product running on PC hardware platform and Windows operating system. It can also form HMI products together with PC or ipc.General configuration software supports a wide range of equipment, such as a variety of PLC, PC board CARDS, instruments, inverters, modules and other equipment, and because the PC hardware platform performance is strong (mainly reflected in the speed and storage capacity), general configuration software function is also strong, suitable for large monitoring systems.
Human - machine interface products have operating systems
Any human-machine interface product has a system software part. The system software runs in the HMI processor, supporting the multi-task processing function. A small operating system management system software is required to run in the processor.Generally, WinCE, Linux and other common embedded operating systems are used in high performance human-computer interface products based on tablet computers.
Is the man-machine interface only connected to PLC?
No.Human-machine interface products is to solve the problem of PLC human-computer interaction, but with the development of computer technology and digital circuit technology, many industrial control equipment has a serial port communication ability, so as long as there is a serial port communication ability of the industrial control equipment, such as frequency converter, dc speed regulator, temperature control instrument, for module can connect human-machine interface products, to realize the human-computer interaction function.
PC plus touch screen, can directly communicate with PLC, complete the function of HMI?
Sure.However, the corresponding HMI software must be compiled to make the PC into a real HMI product.
Can the HMI only be connected to other devices via a standard serial port?
Most of the time.However, with the development of computer and digital circuit technology, the interface capability of human-computer interface products is becoming stronger and stronger.In addition to the traditional serial (RS232, RS422/RS485) communication interfaces, some human-machine interface products have data interfaces such as network interface, parallel interface and USB interface. They can be connected with industrial control devices with interfaces such as network interface, parallel interface and USB interface to realize human-machine interaction of devices.
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