Foxboro DM900NY FBM27 Contact /125VDC I/O Expander Fieldbus Module

Technical Specifications

Model:DM900NY

Brand:Foxboro

System compatibility:I/A Series DCS system,FBM fieldbus I/O subsystem mixed‑signal expansion module

Function:FBM27 mixed‑signal I/O expander module,collects 125VDC field status signals and provides dry‑contact relay output for field actuators,expands discrete signal processing capacity of FBM station

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

Signal type:Mixed 125VDC discrete input and form A dry‑contact relay output

Input circuit:Opto‑electrical galvanic isolation for DC input channels

Output circuit:Dry‑contact relay output compatible with 125VDC field load,RC surge‑suppression per relay channel

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

Diagnostic:Per‑channel green LED for input and output status;multi‑color front‑panel LED for module power and fieldbus communication fault

Power supply:Powered via FBM baseplate backplane

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

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

Protection class:IP20

Horizontal operating temperature:0℃ ~ +60℃

Vertical operating temperature:‑20℃ ~ +55℃

Storage temperature:‑40℃ ~ +85℃

Relative humidity:5%‑95% non‑condensing

Weight:0.98kg

Dimensions:36mm × 128mm × 144mm

Certification:CE,UL

MTBF:>84000 hours

Built‑in function

DM900NY FBM27 I/O expander module is signal expansion hardware for legacy Foxboro I/A‑Series DCS system. It acquires 125VDC equipment status signals from field‑side sensors and switches through opto‑isolated input loops. Relay dry‑contact outputs drive on‑site solenoid valves and contactors. Independent channel‑isolation design restrains ground‑loop interference. RC surge‑suppression absorbs inductive‑load back‑EMF to protect relay contacts. Hot‑swap function supports online module replacement and reduces plant downtime risk. Per‑channel LED facilitates quick on‑site signal inspection,widely applied for discrete‑signal capacity‑expansion cabinets in petrochemical,chemical and power‑plant DCS facilities.

Product Brief

DM900NY belongs to Foxboro I/A Series legacy DCS FBM I/O spare‑part family,obsolete original fieldbus mixed‑I/O expander component. Must be matched with corresponding FBM baseplate assembly. Widely used for original Foxboro DCS equipment maintenance and renovation. ESD anti‑static protection shall be followed during installation.