Foxboro DM900NX FBM25 Analog Input Fieldbus Module

Technical Specifications

Model:DM900NX

Brand:Foxboro

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

Function:FBM25 analog input fieldbus module,acquires multi‑range analog measuring signals from field transmitters and sensors

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

Signal type:Support 4‑20mA current input and ±10V voltage input

Circuit feature:Independent galvanic isolation between each analog channel and module internal logic

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 signal over‑range and open‑circuit detection

Power supply:Powered via FBM baseplate backplane

Protection:Built‑in transient surge protection for each analog signal terminal

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

DM900NX FBM25 analog input module is multi‑signal acquisition hardware for Foxboro I/A‑Series DCS system. It collects 4‑20mA and voltage‑type measuring signals from pressure,flow,temperature and level field transmitters. Channel‑wise galvanic isolation effectively suppresses ground‑loop interference from complex industrial sites. Built‑in open‑circuit and over‑range diagnosis helps quickly locate field instrument faults. Hot‑swap function supports online module replacement and reduces plant downtime risk. Front‑panel LED feedback facilitates on‑site fault inspection,widely applied for mass analog signal acquisition loops in petrochemical,chemical and power‑plant DCS cabinets.

Product Brief

DM900NX belongs to Foxboro I/A Series legacy DCS FBM analog‑I/O spare‑part family,obsolete original fieldbus analog‑input 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.