描述
FBM228 現(xiàn)場(chǎng)總線冗余模塊
基金會(huì)?現(xiàn)場(chǎng)總線冗余模塊(FBM228)提供了基金會(huì)現(xiàn)場(chǎng)總線設(shè)備和Foxboro?DCS之間的高容量接口。fbm228支持單路或冗余配置,支持4路h1link,最多可配置64臺(tái)現(xiàn)場(chǎng)總線設(shè)備。
H1現(xiàn)場(chǎng)總線是一種雙向全數(shù)字通信總線,專為過(guò)程測(cè)量和控制設(shè)備的集成而設(shè)計(jì)。H1總線提供傳統(tǒng)4至20 mA標(biāo)準(zhǔn)的所有優(yōu)點(diǎn),同時(shí)為控制和系統(tǒng)健康信息提供更大的數(shù)據(jù)訪問(wèn)。
FBM228使控制站能夠訪問(wèn)任何h1b設(shè)備中的任何塊參數(shù)。使用FOUNDATION現(xiàn)場(chǎng)總線塊,H1設(shè)備中的參數(shù)在控制站內(nèi)存中動(dòng)態(tài)更新,并可連接到控制站中的所有其他塊,從而允許輕松構(gòu)建包含H1功能塊和控制站塊的控制回路。
使用FBM228和Foxboro DCS控制軟件,對(duì)于每個(gè)控制回路,您可以選擇在現(xiàn)場(chǎng)設(shè)備或主機(jī)控制站中定位PID塊。復(fù)雜的策略可以細(xì)分,以便由AI,PID和AO設(shè)備塊組成的更快的次級(jí)回路在現(xiàn)場(chǎng)運(yùn)行,而主PID回路和其他復(fù)雜塊在主機(jī)系統(tǒng)中運(yùn)行。
FBM228還支持增強(qiáng)的DCI塊集,使控制站能夠訪問(wèn)H1設(shè)備中的塊參數(shù)。由offset指定的參數(shù)。子索引是資源、傳感器和功能塊中的參數(shù)。例如,可以使用這些DCI塊來(lái)獲取設(shè)備診斷信息,以開(kāi)發(fā)維護(hù)和警報(bào)策略。
這些模塊包括:
?二進(jìn)制輸入的BIN
?IIN用于整數(shù)值
?RIN為實(shí)際輸入
?實(shí)際輸出的路由
?PAKIN用于位枚舉參數(shù)
?字符串?dāng)?shù)據(jù)的字符串FBM228是電氣兼容的標(biāo)準(zhǔn)哈特信號(hào)
FBM228 現(xiàn)場(chǎng)總線冗余模塊
The FOUNDATION? Fieldbus Redundant Module (FBM228) provides a highcapacity interface between FOUNDATION fieldbus devices and Foxboro? DCS. TheFBM228, which can be used in single or redundant configurations, supports four H1Links for a maximum of 64 fieldbus devices.
The H1 fieldbus is a bi-directional, all digital communication bus designed for theintegration of process measurement and control devices. The H1 bus provides all thebenefits of the traditional 4 to 20 mA standard, while providing greater data access toboth control and system health information.
The FBM228 enables the control station to access any block parameter in any H1device. With FOUNDATION fieldbus blocks, parameters in the H1 device aredynamically updated in the control station memory and are connectable to all otherblocks in the station, thus allowing easy construction of control loops that contain H1function blocks and control station blocks.
With the FBM228 and Foxboro DCS Control Software, for each control loop you havea choice of locating the PID block in the field device or in the host control station. Complex strategies can be subdivided so that faster secondary loops consisting of AI,PID and AO device blocks run in the field, while the primary PID loop and othercomplex blocks run in the host system.
The FBM228 also supports an enhanced DCI block set that enables the controlstation to access block parameters in an H1 device. The parameters specified byoffset. subindex are the parameters in resource, transducer, and function blocks. These DCI blocks can be used, for example, to source device diagnostic informationfor the development of maintenance and alarm strategies.
The blocks include:
? BIN for binary input
? IIN for integer values
? RIN for real input
? ROUT for real output
? PAKIN for bit-enumerated parameters
? STRIN for string dataThe FBM228 is electrically compatible with standard HARTsignals
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