Product Core Brief

• Model: FBM216B (Associated Part: P0927AJ)
• Brand: Foxboro (Schneider Electric / Invensys)
• Series: I/A Series 200 FBM
• Core Function: Receives 8 isolated analog inputs with HART digital communication overlay and supports module-level redundancy.
• Product Type: Redundant HART Communication Input Module
• Key Specs: 8 Channels | 4-20mA + HART FSK | FBM-Level Redundancy
• Condition: New Original / New Surplus

FOXBORO FBM216

Product Introduction

The Foxboro serves as a high-reliability HART communication input module for the I/A Series distributed control system. This industrial automation unit provides eight independent, isolated input channels capable of accepting standard 4-20mA analog signals or digital HART signals superimposed on the analog loop.

This replacement module is designed for critical applications requiring high availability. It operates in a redundant pair configuration at the Fieldbus Module (FBM) level, where one unit acts as the Primary and the other as the Tracker, ensuring seamless failover if a module fails. Each channel features a dedicated FSK modem to enable two-way digital communication with smart field devices.

Key Technical Specifications

Quality Control Process

Every replacement module undergoes strict electrical validation. We first verify the 24 VDC power draw and internal regulator stability using a calibrated Fluke multimeter. Next, we perform signal injection testing on all eight channels using a precision loop calibrator and HART communicator to verify both analog accuracy and digital handshake integrity. We then inspect the backplane edge connector for bent pins or oxidation, as physical damage is a common cause of intermittent communication faults. All units ship in anti-static shielding.

Replacement Pitfall Guide

❗ Verify Redundancy Pairing. The is designed to work in a redundant pair. Ensure you are installing the correct Primary and Tracker modules as defined by your system configuration. Swapping their roles or installing a single non-redundant unit in a redundant slot will cause system alarms and defeat the safety design.

❗ Check HART Communication Speed. This module supports standard HART polling but does not support Burst Mode communication. Ensure your field devices are configured for standard polling and that your DCS polling rate (approx. 2 messages/sec/channel) is sufficient for your diagnostic needs.

❗ Confirm Channel Isolation. All eight input channels are electrically isolated from each other, ground, and module logic. Do not attempt to tie input commons together externally, as this defeats the isolation and introduces ground loop noise.

❗ Inspect Terminal Assembly (TA). The requires a specific Terminal Assembly for field wiring. Ensure the TA is fully seated and locked onto the FBM before applying power. Loose connections here are a primary cause of signal drift and HART communication failures.

Keep these in mind and you’ll cut 90% of rework time.

FOXBORO FBM216

Compatibility Matrix & Benchmarks

• Signal Accuracy: ±0.075% full-scale precision with 15-bit resolution.
• Data Integration: Seamless backplane communication with I/A Series controllers.