Foxboro AD908AA Fieldbus Analog Input Module

Technical Specifications

Model:AD908AA

Brand:Foxboro

System compatibility:I/A Series DCS system

Function:Fieldbus multi‑channel analog signal acquisition,convert field analog signal to digital data for DCS controller

Installation:Rack‑mount installation,mated with matched I/A series baseplate

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

Input signal:4‑20mA current loop,0‑5V voltage process signal

Isolation strength:Per‑channel galvanic isolation between field side and internal circuit

Accuracy:±0.12% full scale

Resolution:12‑bit analog‑to‑digital conversion

Protection:Built‑in over‑current,over‑voltage and channel short‑circuit protection

Diagnostic:On‑board multi‑color LED for module power,fieldbus communication and single‑channel fault alarm

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

Housing:Aluminum ribbed metal housing,anti‑vibration mechanical reinforcement

Protection class:IP20

Horizontal operating temperature:0℃ ~ +60℃

Vertical operating temperature:‑20℃ ~ +55℃

Storage temperature:‑40℃ ~ +85℃

Relative humidity:5%‑95% non‑condensing

Weight:0.47kg

Dimensions:36mm × 128mm × 144mm

Certification:CE,UL

MTBF:>90000 hours

Built‑in function

AD908AA FBM analog input module receives analog signals from field transmitters,realizes per‑channel galvanic isolation to suppress ground‑loop interference. It transmits converted digital values to I/A Series controller via fieldbus baseplate backplane. Hot‑swap function enables online module replacement and reduces plant downtime risk. Independent channel fault diagnosis helps technicians rapidly locate abnormal input channels,widely applied for pressure,flow,temperature and liquid‑level measurement loops in petrochemical,chemical and continuous‑running power‑plant facilities.

Product Brief

AD908AA belongs to Foxboro I/A Series legacy DCS spare‑part family,obsolete original automation component. It must be matched with corresponding I/A series baseplate and complete correct field transmitter wiring. Widely used for original Foxboro DCS equipment maintenance and renovation. ESD anti‑static protection shall be followed during installation