What is the difference between PLC man-machine interface and touch screen?

The media and dialogue interface for transmitting and exchanging information between people and computers are important components of computer systems. It realizes the transformation between the internal form of information and the acceptable form of human beings. Man-machine interface exists in all fields involving man-machine information exchange. Touch screen, that is, touch pad, belongs to the hardware category, just like the keyboard and mouse on the computer.

Strictly speaking, there are essential differences between the two. Because the "touch screen" is only a hardware part that may be used in human-computer interface products, it is an input device installed in the front of the display screen, not a mouse and keyboard. Man-machine interface product is a kind of man-machine interaction equipment including hardware and software. In the industry, people often refer to the man-machine interface products with touch input function as "touch screen", but this is unscientific.