P0903AY FBMSLT | Foxboro | I/A Series Analog Input Module

Foxboro FBMSLT | P0903AY | Schneider Electric | Single Loop Transmitter Fieldbus Module

Product Overview

The FBMSLT (Model: FBMSLT) is a high-integrity Single Loop Transmitter Fieldbus Module developed for the Foxboro I/A Series Distributed Control System (DCS), currently integrated into Schneider Electric’s EcoStruxure Foxboro architecture. Unlike high-density modules that aggregate multiple signals, the FBMSLT (Part Number: P0903AY) is dedicated to supporting a single 4–20 mA analog loop. This architecture provides maximum loop integrity, ensuring that a hardware failure on one channel remains isolated and does not impact other process variables.

The FBMSLT (Model: FBMSLT) provides integrated loop power to field transmitters, eliminating the need for external power supplies in standard 2-wire configurations. It incorporates advanced signal conditioning, 16-bit A/D conversion, and galvanic isolation between the field-side loop and the system electronics. This module is the preferred choice for safety-critical monitoring and high-availability loops in heavy industrial environments such as refining, offshore oil & gas, and power generation.

Detailed Technical Specifications

The FBMSLT is designed for precision and reliability in decentralized I/O configurations.

• Manufacturer: Foxboro (Schneider Electric)

• Model Number: FBMSLT

• Part Number: P0903AY

• Product Type: Single Loop Transmitter Fieldbus Module

• System Compatibility: Foxboro I/A Series, EcoStruxure Foxboro

• Number of Channels: 1 Channel

• Input Signal Type: 4–20 mA DC (Supports 2-wire or 4-wire transmitters)

• Loop Power Supply: Integrated (Typically 24 V DC)

• A/D Resolution: 16-bit binary

• Accuracy: ±0.1% of span

• Input Impedance: 250 Ω (Internal precision resistor)

• Isolation: Channel-to-system galvanic isolation

• Communication: Redundant 2Mbps Fieldbus

• Diagnostics: Real-time monitoring for open loop, short circuit, and module health

• Redundancy: Supports redundant pairing for zero-downtime requirements

• Operating Temperature: 0 °C to +60 °C

• Storage Temperature: –40 °C to +70 °C

• Dimensions: Standard FBM footprint (10.2 x 4.5 x 10.4 cm)

• Origin: USA / France

Industrial Application Scenarios

The FBMSLT (Part Number: P0903AY) is utilized where loop independence is a priority:

• Critical Pressure Monitoring: High-pressure steam lines where individual loop integrity is required for safety protocols.

• Remote Custody Transfer: Accurate flow measurement in remote locations where a single, high-resolution transmitter interface is needed.

• Corrosive Environment Sensing: Interfacing with level or temperature transmitters in harsh chemical zones where signal isolation is critical.

• Safety Instrumented Systems (SIS): Serving as a reliable input for safety logic solvers in emergency shutdown (ESD) applications.