3503EN 可互操作的网络将现场各控制器及仪表设备互连

3503EN module

FCS is born in line with the above trend, it uses the fieldbus this open, with interoperable network to interconnect the field controller and instrument equipment, constitute the fieldbus control system, while the control function is placed on the site, reducing the installation cost and maintenance costs. Therefore, the essence of FCS is an open, interoperable and decentralized distributed control system, which is expected to become the mainstream product of control systems in the 21st century.

Fieldbus and fieldbus control system

The concept of fieldbus

Fieldbus is a real-time control communication network that interconnects the automation underlying field controller and field intelligent instrumentation devices, following all or part of the communication protocol of ISO’s OSI Open Systems Interconnection reference model. FCS is a real-time network control system that uses an open fieldbus control communication network to connect the automation base field controller and field intelligent instrument equipment

The difference between fieldbus and LAN

According to the function comparison, the fieldbus connects the field controller and the field intelligent instrument equipment at the bottom of the automation, and the data information transmitted on the network cable is small batches of data information, such as detection information, status information, control information, etc., with low transmission rate but high real-time performance. In short, fieldbus is a real-time control network. LAN is used to connect each computer in the local area, the network cable is transmitted on a large number of digital information, such as text, sound, images, etc., the transmission rate is high, but it does not require real-time. In this sense, local area network is a kind of high-speed information network.

According to the implementation method, fieldbus can use various communication media, such as twisted pair, power line, optical fiber, wireless, infrared, etc., to achieve low cost. Local area networks require cables, such as coaxial cables, optical fibers, etc., and the implementation cost is high.