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FBM214B/216B RH924JH HART Communication Input Module

A Fieldbus Communication Module or a Control Processor interfaces the redundant 2 Mbps module Fieldbus used by the FBMs. The FBM214b module accepts communication from either path (A or B) of the redundant 2 Mbps fieldbus. If one path is unsuccessful or is switched off at the system level, the module continues communication over the active path.
The use of an external power supply common to two or more loops requires a Cable Balun Module to maintain communication signal line balance.

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Essential details:FBM214B/216B RH924JH HART Communication Input Module

A Fieldbus Communication Module or a Control Processor interfaces the redundant 2 Mbps module Fieldbus used by the FBMs. The FBM214b module accepts communication from either path (A or B) of the redundant 2 Mbps fieldbus. If one path is unsuccessful or is switched off at the system level, the module continues communication over the active path.
The use of an external power supply common to two or more loops requires a Cable Balun Module to maintain communication signal line balance.

The Compact FBM214b provides sufficient loop resistance to allow use of the HART Hand-Held Terminal or PC20 Intelligent Field Device Configurator (IFDC).

The module mounts on a modular baseplate which accommodates up to four or eight FBMs. The modular baseplate is either DIN rail mounted or rack mounted, and includes signal connectors for redundant fieldbus, redundant independent dc power, and termination cables.

FBM214B P0927AH

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FBM214B/216B RH924JH HART Communication Input Module

The Cable Balun module is used to maintain digital communication line balance for HART Transmitter to FBM loops that are powered from a common external power supply. This powering effectively connects one line of each loop together. Without the Baluns, in each loop so powered, the common connection at the external power supply, would cause near end crosstalk at the system end of the loop wiring cable. Loops using FBM internal power source do not require Baluns.
The Cable Balun module contains multiple Baluns. One Balun segment is interconnected in each externally powered loop (see Cable Balun Module). There is one Cable Balun module for four channels.

• Supported HART Instruments: HART instruments compliant to Version 5, 6, or 7 of the HARTspecifications may be used
• Interface: 8 individually isolated channels
• Communication to the Device: Point-to-point, master/slave, asynchronous, half-duplex, at 1200 baud
• Detected Error Checking: Parity on each byte, and one CRC check byte
• Speed: 2 messages per second
• Fastest Allowed ECB Block Period: 100 msec – However, we recommend that you see the Sizing Guidelines and Excel
Workbook appropriate for your Control Processor to determine the optimal loading for a 100 msec Block Processing Cycle (BPC)
• Maximum Distance (FBM214b to Field Device): Meets HART FSK physical layer specification HCF_SPEC-54, Revision 8.1 [up to 3,030 m (10,000 ft)]

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