Industrial touch display is an intelligent interface that connects man and machine through touch industrial display. It is an intelligent operation display terminal that replaces traditional control buttons and indicator lights. It can be used to set parameters, display data, monitor equipment status, and describe the automation control process in the form of curves/animations. It is more convenient, faster, and more expressive, and can be simplified as a PLC control program. The powerful touch screen creates a friendly man-machine interface. As a special computer peripheral, the touch screen is currently the simplest, most convenient and natural way of human-computer interaction. It endows multimedia with a new look and is a very attractive new multimedia interactive device.
Industrial touch monitor principle
A touch screen system generally includes two parts: a touch screen controller (card) and a touch detection device. Among them, the main function of the touch screen controller (card) is to receive touch information from the touch point detection device, convert it into contact coordinates, and then send it to the CPU. It can also receive and execute commands from the CPU: touch detection The device is generally installed at the front of the display, and its main function is to detect the user’s touch position and transmit it to the touch screen control card.
The industrial touch screen has strong flexibility, can replace or add functional modules according to the design requirements, has strong scalability, can meet the complex process control process, and can even directly communicate with the PLC through the network system, which greatly facilitates the processing of control data With the transmission, the amount of maintenance is reduced.
1. Touch display module
The screen body of the resistive touch screen is a multi-layer composite film that matches the surface of the display. It consists of a layer of glass or plexiglass as the base layer, and the surface is coated with a transparent conductive layer. A scratch-resistant plastic layer, its inner surface is also coated with a transparent conductive layer, and there are many small (less than one-thousandth of an inch) transparent isolation points between the two conductive layers to separate and insulate them.
Resistive touch screen is a working environment that is completely isolated from the outside world. It is not afraid of dust and water vapor. It can be touched by any object and can be used for writing and drawing. It is more suitable for industrial control fields and offices. The common disadvantage of resistive touch screens is that because the outer layer of the composite film is made of plastic materials, people who don’t know it may scratch the entire touch screen and cause it to be scrapped if they touch it too hard or use a sharp object. However, within the limit, scratches will only hurt the outer conductive layer, and scratches on the outer conductive layer are irrelevant to five-wire resistive touch screens, but fatal to four-wire r
esistive touch screens.
2. Logic control and communication module
The logic control module includes 24V DC input (18-32) power supply, SDRAM memory and CF flash memory card, 10/100BaseT Ethernet port, 232 serial ports that can be used for file transfer, printing and communication with programmable controllers, and can be used for connection USB ports for mouse, keyboard or printer. The CPU processing chip is embedded on the internal circuit board, which is responsible for the input and output of the display screen and the processing of communication data. The communication module is responsible for specific network transmission to improve the data transmission rate.