FBM228 现场总线冗余模块

描述

FBM228 现场总线冗余模块

FBM228 现场总线冗余模块

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