Currently, with the development of domestic industry, digital display instruments can be seen in many industrial control situations. At the same time, with the increasing accuracy of measurement and control, interference is becoming stronger, and the technology of digital display instruments is constantly developing, and their uses are also expanding. So now the classification of digital display instruments is becoming increasingly detailed.

1、 PLC/DCS system digital display instrument
The digital display instrument of PLC/DCS system is a digital display meter that can communicate with the PLC/DCS system. The data is provided by the PLC/DCS system and is very stable. It is widely used in industrial production. Since a company in the United States used * PLC/DCS systems in 1968, a series of PLC supporting facilities such as PLC digital displays have gradually developed. Currently, the technology of PLC digital displays is very mature, and data exchange between PLC/DCS systems and meters can be completed through two wires. PLC/DCS systems can also be replaced by microcontrollers and directly placed in digital displays, making their size smaller and their applications constantly expanding.

2、 PC/Industrial Control Computer Digital Display Instrument
The digital display meter is connected to a PC/industrial computer, and the PC communicates through serial parallel ports to control the display of the digital display meter.

3、 Digital display controller
Digital display instruments can not only display data, but also control the monitored objects

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