Process Engineering Division – Instrumentation and Automation Section – Daily Topics – Topic No. 2021-01-29
Thread Content
Process Engineering Division – Instrumentation and Automation Section – Daily Topics – Topic No. 2021-01-29: Discussion question: 372. On what basis are constant-value control systems, program-controlled systems, and follow-up control systems classified?
Following a pattern of change according to given values means that the target value that your control system needs to achieve is constantly changing, such as radar tracking targets or missiles tracking flying objects, and so on； Constant value control means that the target to be achieved through regulation is known and fixed, such as level control, temperature control, and pressure control – the latter being more common in industrial processes and everyday life.
Constant-value control systems, program-controlled systems, and follow-up control systems are distinguished based on the changes specified by the controller. The setpoint of the controller in a constant-value control system is a fixed value; hence it is called a constant-value control system. The purpose of such a control system is to maintain the controlled parameter at a constant level ； The setpoint of the program control system controller changes at regular time intervals (program variation), and the purpose of the control system is to enable the controlled parameters to follow these programmed variations ； The setpoint of the controller in a follow-up control system varies according to a certain function, and the purpose of the control system is to enable the controlled parameter to track the changes in this setpoint function.
Following a pattern of change according to given values means that the target value that your control system needs to achieve is constantly changing, such as radar tracking targets or missiles tracking flying objects, and so on； Constant value control means that the target to be achieved through regulation is known and fixed, such as level control, temperature control, and pressure control – the latter being more common in industrial processes and everyday life.