Foxboro AD908AE Fieldbus Analog Output Module

Technical Specifications

Model:AD908AE

Brand:Foxboro

System compatibility:I/A Series DCS system

Function:Multi‑channel analog output,convert DCS digital bus data to 4‑20mA analog signal for field actuators

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

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

Output signal:4‑20mA analog current‑loop control output

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

Accuracy:±0.12% full scale

Resolution:12‑bit digital‑to‑analog conversion

Protection:Independent per‑channel over‑current and short‑circuit protection,single‑channel fault will not affect other working channels

Diagnostic:On‑board multi‑color LED for module power,fieldbus communication and individual 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

AD908AE FBM analog output module receives digital set‑point data from I/A Series controller via fieldbus baseplate,converts digital values into 4‑20mA analog output to drive field control valves and actuators. Per‑channel galvanic isolation restrains ground‑loop interference from complex industrial grounding environment. Independent short‑circuit protection prevents single‑loop wiring failure from spreading fault across whole module. Hot‑swap function supports online module replacement to reduce plant downtime risk. LED diagnostic indicators help technicians rapidly locate power,communication and output‑channel abnormal conditions,widely applied for pressure,flow,temperature and liquid‑level control loops in petrochemical,chemical and power‑plant continuous‑process facilities.

Product Brief

AD908AE belongs to Foxboro I/A Series legacy DCS spare‑part family,obsolete original automation component. It must pair with corresponding I/A series baseplate and complete correct field actuator wiring. Widely used for original Foxboro DCS equipment maintenance and renovation. ESD anti‑static protection shall be followed during installation