DCS system is a comprehensive control system emerging with the continuous rise of modern large-scale industrial production automation and the increasingly complex process control requirements, it is the product of the combination of computer technology, system control technology, network communication technology and multimedia technology, which can provide window-friendly human-computer interface and powerful communication function. It is a modern equipment to complete process control and process management.
Main technical overview of the system
· The system mainly consists of on-site control station (I/O station), data communication system, Man-Machine Interface Unit (operator station OPS, engineer station ENS), cabinet, power supply, etc. The system has an open architecture and can provide multi-layer open data interfaces.
The hardware system has high reliability, convenient maintenance and advanced technology in the harsh industrial site. The bottom-layer Chinese software platform has powerful processing function, and provides the ability of convenient configuration of complex control system and the support ability of user-developed special advanced control algorithm; easy configuration and easy to use. Support a variety of fieldbus standards to meet the needs of future expansion.
· The design of the system adopts appropriate redundant configuration and self-diagnosis function from diagnosis to module level, which has high reliability. Failure of any component in the system will not affect the work of the whole system.
· The system's parameters, alarms, self-diagnosis and other management functions are highly centralized on CRT display and printed on the printer, and the control system is really decentralized in function and physics,
The availability rate of the whole system is at least 99.9%; the average time of failure-free of the system is 100 thousand hours, which realizes the complete monitoring of many fields such as nuclear power, thermal power, thermal power, petrochemical, chemical engineering, metallurgy and building materials.
· The concept of "domain. The large control system is divided into several relatively independent sub-systems by high-speed real-time redundancy network. A sub-system constitutes a domain, and each domain shares management and operation data, and each region is a fully functional DCS system, so as to better meet the user's needs.
Reliability, openness and advancement of network structure. In the system operation layer, redundant 100 Mbps Ethernet is adopted; in the control layer, redundant 100 Mbps industrial Ethernet is adopted to ensure the reliability of the system; in the field signal processing layer, 12 Mbps PROFIBUS bus connects the central control unit and each field signal processing module.
Standard Client/Server structure. The operation layer of MACS adopts the Client/Server structure
Open and reliable operating system. The operating layer of the system adopts windows nt operating system; the control station adopts mature embedded real-time multitask operating system QNS to ensure the real-time, safety and reliability of the control system.
· Standard control configuration software. The system adopts IEC1131-3 standard control configuration tools, which can realize any monitoring and control requirements.
· Expandability and tailability to ensure economy.
