Foxboro DM900HU FBM26 Analog Fieldbus Module

Technical Specifications

Model:DM900HU

Brand:Foxboro

System compatibility:I/A Series DCS system,FBM fieldbus I/O subsystem analog processing module

Function:FBM26 analog fieldbus module,acquires 4‑20mA field transmitter signals and outputs 4‑20mA analog signals to drive valve positioners and analog actuators

Installation:Baseplate‑mount installation,mated with dedicated FBM baseplate assembly

Signal range:4‑20mA industry‑standard analog process signal

Circuit feature:Galvanic isolation between each analog channel and internal logic circuit

Feature:Support hot‑swap online replacement without subsystem power‑off

Diagnostic:Front‑panel multi‑color LED indicators for module power,fieldbus link and channel fault alarm;hardware self‑diagnosis for over‑range signal detection

Power supply:Powered via FBM baseplate backplane

Protection:Built‑in transient surge protection for analog signal terminals

Environmental standard:Compliant with ISA‑S71.04 Class G3 industrial atmospheric condition

Housing:Aluminum alloy metal housing,slot‑in baseplate mechanical locking structure

Protection class:IP20

Horizontal operating temperature:0℃ ~ +60℃

Vertical operating temperature:‑20℃ ~ +55℃

Storage temperature:‑40℃ ~ +85℃

Relative humidity:5%‑95% non‑condensing

Weight:0.99kg

Dimensions:36mm × 128mm × 144mm

Certification:CE,UL

MTBF:>84000 hours

Built‑in function

DM900HU FBM26 analog fieldbus module is standard analog signal processing unit for Foxboro I/A‑Series DCS system. It receives 4‑20mA measuring signals from field pressure,flow and temperature transmitters,and outputs 4‑20mA control signals for valve positioners. Independent channel‑to‑logic galvanic isolation suppresses ground‑loop interference in complex industrial sites. Hot‑swap function supports online module replacement and reduces plant downtime risk. Built‑in signal over‑range diagnosis helps on‑site troubleshooting,widely applied for PID regulation analog control loops in petrochemical,chemical and power‑plant DCS cabinets.

Product Brief

DM900HU belongs to Foxboro I/A Series legacy DCS FBM analog I/O spare‑part family,obsolete original fieldbus analog‑I/O module component. Must be matched with corresponding FBM baseplate assembly. Widely used for original Foxboro DCS equipment maintenance and renovation. ESD anti‑static protection shall be followed during installation.