Fieldbus And Dcs, Fcs Of The Linkages Between-dcs, Fcs-electric Industry
FCS is Fieldbus Control technology, which is the same thing.
FCS is PLC Evolved; while in other industries, FCS in turn, DCS Evolved, so FCS and PLC And DCS are inextricably linked, there is essential difference.
FCS is evolved by the DCS and PLC, FCS not only have the characteristics of DCS and PLC, and taken a revolutionary step. At present, the new DCS with the new PLC, has a tendency to move closer to each other. DCS has a strong new order of control; the new PLC, in dealing with closed-loop control is not bad, and both can form large networks, DCS and PLC's application, has a great cross.
DCS system, the key is communication. Data can also be said highway is the backbone of distributed control system DCS. Since its mission is to provide communication between all system components the network, therefore, data highway, the design itself determines the overall flexibility and security. Data highway, the media can be: a pair of conductors, coaxial cable or fiber optic cable.
Through the data highway, the design parameters, basically about a specific DCS system, the relative strengths and weaknesses.
(1) system can handle the number of I / O information.
(2) how much the system can handle and control information related to the control loop.
(3) to adapt the number of users and devices (CRT, control stations, etc).
(4) data integrity is how thorough examination.
(5) data highway, the maximum allowable length is.
(6) data highway to support the number of slip.
(7) whether the data support the road Other Factory production of hardware (programmable logic controller, computer, data recording devices, etc.).
To ensure the integrity of communications, most DCS manufacturers can provide redundant data highway.
To ensure system security, using a complex communication protocol and error detection techniques. The so-called communication protocol that is a set of rules to ensure that the transmitted data is received and understood, and send the data were the same.
Now generally used in the DCS system, two types of means of communication, that is, synchronous and asynchronous, synchronous communication rely on a clock signal to adjust the data transmission and reception of asynchronous network reporting system with no clock.
FCS FCS There are three key points
(1) FCS is the core of the system bus protocol, the bus standard
Has been described in previous sections, one type of bus, as long as the bus protocol has been established, the related key technologies and related equipment also been identified. Agreement on the basic principles of their bus, the bus is the same all have to address the bi-directional serial digital transmission as the basis for communication. However, for various reasons, various types of bus-bus protocol there is a big difference. In order to meet
fieldbus interoperability requirements, making it a truly open system, the IEC international standard, field bus communication protocol model of the user tier, on the specified user-level description of a device function. In order to achieve interoperability, each field bus devices are used to describe the device described in DD.
by: gaga
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