Product Description:

At present, distributed control system (DCS) is used in the main process of thermal power unit, which is very necessary to ensure the safe and economic operation of large thermal power unit and improve the operation management level of power plant. In the mid-1990s, distributed remote intelligent I / O as a fieldbus instrument was widely used in 125MW 600MW thermal power unit. The technical features of distributed remote intelligent I / O for metal temperature group measurement of main and auxiliary machines:

(1) Decentralization: the distributed remote intelligent I / O system better embodies the idea of information concentration and control decentralization than DCS system. Each channel of distributed remote intelligent I / O adopts independent power supply and CPU for data acquisition and processing. Even if any front-end fails, the normal operation of other front-end will not be affected. DCS only realizes the control decentralization at the control station level, while distributed remote intelligent I / O realizes the control decentralization at the field control equipment level.

(2) Reliability: the number of safety barriers, isolators, terminal cabinets, I / O modules, field cables and terminal blocks of distributed remote intelligent I / O is greatly reduced, and the field signal is transmitted digitally, which greatly improves the anti-interference ability of the system.

(3) High precision: the introduction of distributed remote intelligent I / O into fieldbus can eliminate the error of data transmission in analog communication mode and improve the transmission precision. Fieldbus uses digital signal to transmit data, does not need a / D, D / a conversion, so it does not produce conversion error and improves transmission accuracy.

（4） Openness: fieldbus control system has openness, consistency and openness to relevant standards, and emphasizes consensus and compliance with standards. The communication protocol is uniformly open, information exchange can be realized between the equipment of each manufacturer, and the open interconnection system in the automation field can be constructed through the field bus. Openness determines its interoperability and interoperability.

(5) Economy: due to the change of distributed remote intelligent I / O architecture, distributed remote intelligent I / O saves more hardware devices than DCS. Using distributed remote intelligent I / O can greatly reduce safety barriers, isolators, I / O modules, field cables and terminal blocks, thus saving I / O devices, cabinets and space for installing these devices, and greatly reducing installation costs.

(6) Easy to maintain: due to the complete dispersion of field level, at the same time, a large number of safety barriers, isolators, I / O modules, field cables and terminal blocks are reduced. Therefore, the distributed remote intelligent I / O greatly improves its maintenance performance.

(7) Environment adaptability: the environment temperature of distributed remote intelligent I / O is - 20 ℃ - 70 ℃, and the protection grade is IP56, so it is suitable for places with poor temperature environment such as boiler top.