The multilevelcontrolsystem bases on PLC and industry control computer, which is made up of high-quality periphery modules.
系统以工控机和PLC为中心，配以高性能的模块化外设组成一体化的计算机多级控制系统；
2
The paper describes the system structure, control theory and its characteristic of the advanced drive device of the multilevel configuration control technology.
介绍了当今最先进的多电平结构的传动系统的组成结构、控制原理及主要特点。
3
Inference control in databases is a key field of multilevel secure database system (MLS-DBS) and is an important means to achieve database security.