Product Overview

The Foxboro FBM228 (P0922QS) functions as a high-performance FOUNDATION Fieldbus H1 interface for the I/A Series and Foxboro Evo Distributed Control Systems (DCS). This 100% Brand New original module provides four isolated H1 communication channels, acting as a link between the control system and digital fieldbus instruments. Unlike standard analog modules, the FBM228 supports bi-directional digital communication, allowing for advanced diagnostics and multi-variable data acquisition. It serves as a critical component in modern petrochemical, power generation, and water treatment facilities that transition from traditional 4-20mA loops to fully digital Fieldbus architectures.

Technical Specifications

• Module Type: FOUNDATION Fieldbus H1 Communication

• Part Number: P0922QS (FBM228)

• Communication Channels: 4 Isolated H1 Channels

• Physical Layer Support: IEC 61158-2 (H1, 31.25 kbit/s)

• Isolation Architecture: Channel-to-channel galvanic isolation; withstands 600 V AC

• System Interface: Redundant Foxboro Fieldbus interface

• Memory Architecture: 16 MB SDRAM, 32 MB Flash

• Power Supply: 24 V DC (Redundant support enabled)

• Operating Temperature: 0 to +60 °C (32 to 140 °F)

• Enclosure Rating: Suitable for Class G3 harsh environments

• Shipping Weight: 2 kg

• Dimensions: 2.2 cm × 12.4 cm × 12.6 cm

Engineering Advantages

• Digital Multi-Drop Efficiency: The P0922QS (FBM228) supports multiple FOUNDATION Fieldbus devices on a single H1 segment. This significantly reduces wiring costs and cabinet footprint compared to traditional point-to-point analog cabling.

• Advanced Asset Management: This module enables full access to digital field device parameters. Maintenance teams can perform remote calibration, status monitoring, and predictive diagnostics, which minimizes site visits and unscheduled downtime.

• Superior Electrical Hardening: The module provides independent 600 V AC galvanic isolation for each of the four H1 segments. This prevents electrical faults or noise on one Fieldbus segment from affecting other segments or the core DCS logic.

• Deterministic Fault Tolerance: The FBM228 integrates into the Foxboro redundant architecture. By pairing modules on a redundant baseplate, the system maintains continuous digital communication with field instruments even if a single hardware module fails.

• Industrial Environment Resilience: A factory-applied G3 conformal coating protects the internal circuitry. This allows the module to operate reliably in chemical processing zones where corrosive gases would otherwise damage standard electronics.

FAQs

• How many field devices can I connect to a single FBM228?The module provides 4 H1 channels. While the theoretical limit per channel is higher, we recommend a practical load based on segment power and cycle time requirements, typically 8 to 12 devices per segment for optimal performance.

• Does the FBM228 provide power to the Fieldbus segment?No. The P0922QS handles communication. You must use an external Fieldbus Power Supply and a compatible Power Link Module/Termination Assembly to power the H1 segments.

• Can I hot-swap the FBM228 while the segment is active?Yes. The module supports hot-swapping on the baseplate. If configured in a redundant pair, the secondary module assumes control immediately without dropping the Fieldbus communication links.