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1、Classification of control systems there are three ways: by automatic classification methods in order to participate in the control mode classification, to adjust the law category. One way to control category 1, the open-loop control system if the computer output of open loop control system to exerci
2、se control of the production process, but the control results - the state of the production process does not affect the computer control systems, computer controller production and other sectors does not constitute a closed loop, is called open-loop control system computer. the production process of
3、 the state is no feedback to the computer, but by the operator to monitor the status of the production process, decision control program, and tell the computer to control the role of exercising control.2, closed loop control system computer to the production of an object or process control, the stat
4、e can directly influence the production process computer control system, called the closed-loop control system computer. Control of the computer monitor in the operator, the automatic acceptance of the production process state test results, calculate and determine the control scheme, the direct comm
5、and and control units (devices) of action, the role of exercising control of the production process. In such systems, aircraft control components under control of control information sent to control device operation, the other running equipment condition as the output, measured by the detection part
6、, the feedback as input to the control computer; to make control Computer Control Components production test components form a closed loop. We will call this form of control computer control closed-loop control. Closed loop control system computer, using a mathematical model to set the value of the
7、production process and test results of the best value of the deviation between the feedback and control the production process to run at their best. 3, line control system as long as the computer controlled production of the controlled object or process, to exercise direct control, without human int
8、ervention are called the control computer on-line control, or on-line control system. 4, offline control system control computer does not directly participate in the control object or the controlled production process. It only managed to complete the process of the controlled object or the status of
9、 testing, and testing of data processing; and then develop control programs, the output control instruction, operator reference control instructions manually controlled operation to control parts of the object or subject control process control. This control form is called off-line computer control
10、system. 5, real-time control system control computer real-time control system is controlled by the control of the object or process, or request when the request processing control, the control function in a timely manner to address and control systems, commonly used in the production process is inte
11、rrupted for the occasion. Such as steel, each one refining furnace steel is a process; and if the process rolling, rolling out each piece of steel considered a process, each process is repeated. Only enter the process only requires a computer control. Once control of the computer, it requires a comp
12、uter from the production process information in the required time to respond to or control. Such systems often use sophisticated interrupt system and interrupt handling procedures to achieve. In summary, an online system is not necessarily a real-time system. But a real-time system must be an online
13、 system. Second, in order to participate in the control mode to Category1, direct digital control system by the control computer to replace conventional analog instruments and direct regulation to control the production process, as the computer as digital signals, so named after the DDC control. Act
14、ually controlled the production process control components, control signals received by the process controller input / output channels of D / (D / A) converter output of the digital control computer volume to be converted into analog; analog input control machine to go through the process of input /
15、 output channels of analog / digital (A / D) converter into a digital number into the computer. DDC control systems often use a small computer or microprocessor, the time-sharing system to achieve multiple points of control. Is in fact a discrete sampling with the controller, to achieve discrete mul
16、ti-point control. DDC computer control system that has become the main control computer control system forms. DDC control of the advantage of flexibility, large, focused on high reliability and low cost. Can use several forms of digital computing circuits, or even dozens of loop production process, integral to proportional - - differential (PID) control to maintain the industrial state of the controlled object at a given value, the deviation small and stable. And as long as
