Defined: Based on multiple microprocessors, the control system designed by adopting the principles of decentralized control function, centralized display operation, and giving consideration to separate autonomy and comprehensive coordination is called Distributed Control System (DCS for short ).
Technical support: Iv c Technology (Computer Technology Computer Communication Technology CRT display technology CRT process Control technology Control)
From the perspective of control system:DCS is a hierarchical control system. Each level completes different functions. Functional stratification system is a prominent feature of decentralized control system and the key to realize decentralized control function and centralized operation display.
1. Process control level equipment: Site station (collection station, control station ). Function: data collection, Operation processing and control output; communication through communication network and control management level. Composition: Communication Module, controller module and I/O module.
2. Control management level equipment: Operator station, engineer station. Function: monitor and operate; interfaces for people and processes. Send data to the production management level through the gateway machine. Engineering configuration, parameter adjustment and system maintenance; interface between human and system. Composition: host and peripherals.
3. Production management level equipment: real-time data server, workstation. Function: monitor and manage the production process at the factory level, diagnose and analyze the failure at the factory level, and calculate the performance index at the factory level. Send data to the operation management level through the gateway machine.
4. Operation and management level equipment: data server, workstation. Function: Factory-level operation management, financial management and personnel management, etc.
From the perspective of information system:DCS is a data communication system with different network structures, connecting each node with different functions, realizing information transmission and exchange among nodes.
From the perspective of computer system: DCS is divided into hardware system and software system.
1. Hardware system a series of intelligent modules, process channels, communication interfaces and various external devices based on microprocessor.
2. Software system includes operating system, database system, data communication software, configuration software and a series of standardized functional modules which control the process to manage the system.
