Digital controller
A digital controller is a kind of electronic controller, is the core part of the computer control system, which is generally connected with the components and equipment of the feedback part of the system. Other parts of the system may be digital or analog. The digital controller usually uses computer software programming to complete a specific control algorithm.
Common types
Direct digital controller
Direct digital controller, also known as "DDC controller". Generally, DDC system consists of central control equipment (centralized control computer, color monitor, keyboard, printer, uninterruptible power supply, communication interface, etc.), field DDC controller, communication network, and corresponding sensors, actuators, regulating valves and other components.
The programmable controller is PC for short, but PLC for short. Its English full name is a programmable controller. It has experienced several different periods: PMC, PSC, PLC, and PC.
PLC is defined as follows in the draft of PLC standard issued by the International Electrical Committee in 1987: "PLC is an electronic device specially designed for digital operation in an industrial environment. It uses programmable memory to store instructions for logic operation, sequence operation, timing, counting and arithmetic operation, and can control various types of machinery or production process through digital or analog input and output. PLC and its related peripheral equipment shall be designed according to the principle of being easy to form a whole with an industrial control system and expand its functions. "
Sequence controller
According to the time sequence or logical relationship specified in the production process, the program is prepared to control each stage of the production process in turn, which is called a sequence controller for short. The control mode of a sequential controller is sometimes sequential control and conditional control.
Digital regulator
The regulator of closed-loop control with digital technology and microelectronics technology, also known as a digital regulating instrument, is a kind of digital controller. It receives the measurement signals from the production process, processes them by the internal digital circuit or microprocessor, generates the output digital signal or analog signal to drive the actuator according to certain regulation rules, and completes the closed-loop control of the production process.
Design
Effect
In the traditional analog control system, the control law or control function of the controller is completed by the hardware circuit of the instrument or electronic device. In the computer control system, in addition to the computer device, it is mainly reflected in the software algorithm, that is, the design of the digital controller.
Classification according to design features
The description method of a computer control system is divided into: first, discretize the continuous controlled object equivalent discrete system mathematical model, and then analyze the whole closed-loop system in the scope of the discrete system; second, equivalent the digital controller to a continuous link, and then use the method of the continuous system to analyze and design the whole control system. Accordingly, the design method can be divided into the simulation design method and discrete design method.
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