Foxboro FBM21 Analog Input Fieldbus Module

Technical Specifications

Model:FBM21

Brand:Foxboro

System compatibility:I/A Series DCS FBM10 series fieldbus subsystem,works with early‑generation FCP controllers,matched with FBM10‑series baseplate and corresponding termination assembly

Function:Old‑generation group‑isolated analog input fieldbus module,acquires 0‑20mA DC current signals from field‑side pressure,level and flow transmitters,8‑channel analog input,group‑wise galvanic isolation(not channel‑to‑channel),multiplexed A/D conversion

Installation:Baseplate‑mount installation,only compatible with FBM10‑series baseplate,matched with dedicated FBM10 termination assembly and cable

Input channel:8‑channel 0‑20mA analog input,group isolation,max 600Ω loop load resistance

Circuit feature:Multiplexed A/D conversion,per‑channel over‑voltage protection,sensor open‑loop fault detection

Feature:Support hot‑swap online replacement without subsystem power‑off,legacy fieldbus communication for I/A‑Series early‑version controllers

Diagnostic:Front‑panel LED indicators for power and fieldbus communication status

Power supply:24VDC via FBM baseplate backplane

Protection:Transient surge absorption for signal channels

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

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

Protection class:IP20

Horizontal operating temperature:0℃ ~ +60℃

Storage temperature:‑40℃ ~ +85℃

Relative humidity:5%‑95% non‑condensing

Weight:1.10kg

Dimensions:36mm ×128mm ×144mm

Certification:CE,UL

Built‑in function

FBM21 legacy analog input module converts field‑transmitter 0‑20mA current signals to digital process data for Foxboro I/A‑Series DCS early‑generation control system. It adopts group‑isolation design instead of per‑channel isolation. It is used for refurbishment and spare‑part replacement of old‑site I/A‑Series control loops. Hot‑swap supports online module replacement without system shutdown,widely applied for pressure,tank‑level and flow‑process‑loop maintenance in petrochemical,chemical and power‑plant facilities.

Product Brief

FBM21 belongs to Foxboro I/A Series legacy DCS FBM10‑series‑analog‑input spare‑part family,obsolete original old‑generation 8‑channel group‑isolated analog‑input module component. Must match with FBM10‑series dedicated baseplate and termination assembly,not interchangeable with FBM200 series modules. Widely used for original Foxboro DCS equipment maintenance and renovation. ESD anti‑static protection shall be followed during installation.