Foxboro FBM204 Mixed Analog Input Output Fieldbus Module

Technical Specifications

Model:FBM204

Brand:Foxboro

System compatibility:I/A Series DCS legacy FBM fieldbus I/O subsystem

Function:Mixed analog‑input‑output fieldbus module,4‑channel 0‑20.4mA analog input acquires process signals from field‑side pressure,level and flow transmitters,4‑channel 0‑20.4mA analog output provides control signals to field actuators,sigma‑delta A/D‑D/A conversion,configurable integration‑time and rate‑of‑change‑limit parameters

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

I/O channel:4 × 0‑20.4mA analog input,4 × 0‑20.4mA analog output,channel‑to‑channel galvanic isolation

Circuit feature:Sigma‑delta high‑precision A/D‑D/A conversion,per‑channel over‑voltage‑over‑current protection,sensor open‑circuit detection,high common‑mode‑noise rejection performance

Feature:Support hot‑swap online replacement without subsystem power‑off,redundant 2Mbps fieldbus communication with FCP/FCM controller

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

Power supply:24VDC via FBM baseplate backplane

Protection:Transient surge absorption for each signal terminal

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℃

Vertical operating temperature:‑20℃ ~ +85℃

Storage temperature:‑40℃ ~ +85℃

Relative humidity:5%‑95% non‑condensing

Weight:1.00kg

Dimensions:36mm ×128mm ×144mm

Certification:CE,UL

MTBF:>83000 hours

Built‑in function

FBM204 mixed analog‑I/O module converts field‑transmitter current‑type process‑signals to digital data and converts DCS control‑commands to analog output‑current for field actuators for Foxboro I/A‑Series DCS system. Channel‑by‑channel galvanic isolation effectively suppresses ground‑loop interference inside instrument cabinet. Sigma‑delta conversion guarantees high‑accuracy measurement and output control. Open‑circuit detection quickly identifies broken field‑wiring faults. Hot‑swap supports online module replacement without system shutdown,widely applied for pressure,tank‑level and flow‑measurement‑control‑loop maintenance in petrochemical,chemical and power‑plant facilities.

Product Brief

FBM204 belongs to Foxboro I/A Series legacy DCS mixed‑analog‑I/O spare‑part family,obsolete original baseplate‑mount 4AI+4AO analog‑input‑output module component. Must match with corresponding FBM baseplate and termination assembly. Widely used for original Foxboro DCS equipment maintenance and renovation. ESD anti‑static protection shall be followed during installation.