Foxboro FBM208 Redundant‑Ready Read‑Back Analog Output Fieldbus Module

Technical Specifications

Model:FBM208

Brand:Foxboro

System compatibility:I/A Series DCS FBM200 series fieldbus I/O subsystem,works with FCP/FCM controller,matched with P0916AK termination assembly and P0916DL pre‑terminated cable assembly

Function:8‑channel galvanically isolated analog output fieldbus module,provides 0‑20.4mA control output signals to field‑side valve positioners and current‑input actuators,sigma‑delta D/A conversion,built‑in per‑channel read‑back circuit for actual output‑current monitoring,configurable integration time,rate‑of‑change‑limit and fail‑safe output‑state parameters,supports redundant‑pair installation on adjacent baseplate slots for high‑availability control loops

Installation:Baseplate‑mount installation,mated with dedicated FBM baseplate,P0916DL pre‑terminated cable and P0916AK field termination assembly

Output channel:8‑channel 0‑20.4mA analog output,channel‑to‑channel galvanic isolation,read‑back sampling for each output channel,max 550Ω field load resistance per channel

Circuit feature:Sigma‑delta high‑precision D/A conversion,per‑channel over‑voltage over‑current protection,output‑current read‑back monitoring circuit,configurable fail‑safe output state

Feature:Support hot‑swap online replacement without subsystem power‑off,redundant 2Mbps fieldbus communication with FCP/FCM controller,supports redundant pairing on adjacent baseplate slots

Diagnostic:Front‑panel multi‑color LED indicators for power and fieldbus communication status,read‑back value comparison diagnostics for output‑loop fault detection

Power supply:24VDC via FBM baseplate backplane,max 12W power consumption for redundant module pair

Protection:Transient surge absorption for each signal channel

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

Built‑in function

FBM208 read‑back analog output module converts DCS control‑commands to 0‑20mA output‑current for field actuators and performs real‑time read‑back sampling of actual output‑current 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‑precision control output. Channel read‑back function realizes output‑loop fault diagnosis including open‑circuit and short‑circuit detection. Configurable fail‑safe action ensures safe actuator state upon module or fieldbus fault. It supports redundant hot‑standby pairing for critical control‑loop applications. Hot‑swap supports online module replacement without system shutdown,widely applied for valve‑position‑control‑loop maintenance in petrochemical,chemical and power‑plant facilities.

Product Brief

FBM208 belongs to Foxboro I/A Series legacy DCS read‑back‑analog‑output spare‑part family,obsolete original baseplate‑mount 8‑channel redundant‑ready analog‑output module component. Must match with corresponding FBM baseplate,P0916DL cable assembly and P0916AK termination assembly. Widely used for original Foxboro DCS equipment maintenance and renovation. ESD anti‑static protection shall be followed during installation.