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With the development of computer technology, control technology, communication technology, and display technology, as well as the diversifying needs of users, regulators have also entered a period of rapid advancement in terms of miniaturization, digitization, and intelligence. Compared to analog regulators, the hardware of digital regulators and their operating principles differ significantly. It is centered around a microprocessor and features extensive computing and control functions as well as digital communication capabilities; it offers flexible and convenient operation methods, intuitive digital and graphical displays, and high levels of safety and reliability, enabling more effective control and management of the production process. Therefore, as soon as digital regulators were introduced, they were well received by users, and their use in industrial processes is becoming increasingly widespread today. Main features of digital regulators: ① They integrate analog instruments with computers. By incorporating a microprocessor (CPU) into the regulator, its functions are greatly enhanced, resulting in an improved performance-to-cost ratio. Taking people’s long-standing *habits into account, the digital regulator retains the characteristics of analog regulators in terms of its physical design, panel layout, and operation method. ②It boasts strong computational control capabilities. Digital regulators have more sophisticated computational control functions than analog regulators; a digital regulator can be used for simple PID control, as well as for cascade control, feedforward control, variable gain control, and Smith compensation control ； It can be adjusted continuously, as well as through sampling adjustment, selective adjustment, and batch adjustment. In addition, digital regulators can also process the input signal, such as linearization, data filtering, scaling, logical operations, etc. ③The required functions are implemented through software; the operational control function of the digital regulator is carried out via software. In programmable regulators, the software system provides various functional modules. The user selects the desired modules and connects them together through programming to create a user program, thereby enabling the desired calculation and control functions. ④It has the same external characteristics as analog regulators. Although all the internal information in digital regulators is in digital form, to ensure compatibility with traditional instruments, these regulators use internationally standard signals for analog input/output (4-20mA, 1-5V), which enables easy connection to DCS systems, PLCs, and other instruments. At the same time, the digital regulator also has digital input/output functions. ⑤It has communication capabilities, facilitating system expansion. In addition to being used to replace analog regulators to form independent control systems, digital regulators can also be combined with a host computer to constitute a DCS. A serial bidirectional digital communication (MODBUS) is established between the digital regulator and the host computer; information such as manual/automatic mode, PID parameters, and input/output values can be sent to the host computer. If necessary, the host computer can also take action on the regulator, such as changing its operating mode or modifying its parameters. ⑥It features high reliability and easy maintenance. In terms of hardware, one digital regulator can replace several analog instruments, and the hardware used in these regulators is highly integrated, ensuring high reliability. In terms of software, the regulation function of the digital regulator is primarily achieved through module software configuration; it possesses various self-diagnosis functions that enable the detection of faults in a timely manner and the implementation of protective measures. Due to the various control algorithms used, there are many digital regulators available, each with different functions and performance characteristics. You can visit the regulator product page (http://yunrun.com.cn/product/list_73.html) to learn more about the applications of digital regulators.