Technical Specifications
Key Features & Benefits
High-Power Output Switching with 2.25 A Per Channel
The FBM41 is specifically designed to drive external loads requiring substantial current. Each of the 8 output channels supports 2.25 A steady-state current with a 12 A total capacity and a 10 A in-rush capability for 20 ms, enabling direct control of industrial actuators, relays, and solenoids without additional interposing relays .
Intelligent Overload Auto-Restart Protection
The module features a built-in overload auto-restart mechanism. When an overload condition is detected, the module opens the circuit for approximately 1 second and then automatically retries. This cycle can repeat indefinitely, effectively preventing module damage from external load short circuits or transient faults .
Eight Isolated Input and Output Channels
The FBM41 provides 8 fully isolated digital input channels and 8 fully isolated digital output channels. Input channels support both contact sense (dry contacts with 24 V DC wetting) and DC voltage monitoring (15–60 V DC logic levels). The per-channel isolation withstands 600 V AC for one minute, protecting the control system from field-side electrical faults and ground loops .
Configurable Input Filtering
The module supports software-configurable input debounce filtering with options for 4, 8, 16, or 32 ms. This eliminates noise-triggered false status indications from motor start electrical noise and contact bounce, while preserving valid equipment fault signals .
Comprehensive LED Diagnostics
The FBM41 features 18 front-panel LEDs: 2 operational status LEDs (1 red, 1 green), plus 8 input channel LEDs and 8 output channel LEDs. This granular indication enables rapid visual diagnostics of individual channel states without requiring workstation access .
Flexible Field Termination Options
The module supports multiple field termination configurations: 32 screw-clamp terminals (2 blocks × 16 terminals) for discrete wire connections, or a 34-pin plug connector (Burndy MSD 34 PM series) for pre-fabricated cable assemblies .
Rugged Industrial Construction
The module is rated for Class G3 (Harsh) environmental contamination per ISA S71.04, making it suitable for corrosive chemical plants, coastal installations, and other demanding industrial settings. It operates reliably across a temperature range of 0°C to +60°C .
Recommended Related Models
Compatible I/A Series Components:
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Main Module Required: FBM41 is an expansion module and must be paired with a compatible main module to connect to the Fieldbus
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Termination Blocks: 32 screw-clamp terminals (2 × 16) or 34-pin connector (Burndy MSD 34 PM series)
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Mounting: Standard I/A Series FBM carrier assemblies
Frequently Asked Questions (FAQ)
Q1: What is the primary function of the Foxboro FBM41 (P0902XA)?
The FBM41 is a High-Power Contact/DC Expansion I/O Module for the I/A Series DCS. It provides 8 digital input channels and 8 high-current digital output channels for controlling external loads such as actuators, relays, and solenoids, extending the discrete I/O capacity of the control system .
Q2: What is the output current capability of the FBM41?
Each output channel supports 2.25 A steady-state current with a 12 A DC total capacity and a 10 A in-rush capability for 20 ms per channel. The module is designed for direct high-power switching without interposing relays .
Q3: What input signal types does the FBM41 support?
The input channels support two modes:
Q4: How does the overload protection work?
When an overload condition is detected, the module opens the circuit for approximately 1 second and then automatically retries. This cycle can repeat indefinitely to protect the module from external load faults .
Q5: Is the FBM41 a main module or expansion module?
The FBM41 is an expansion module. It connects to the redundant Fieldbus via a supporting main module and does not independently interface with the Fieldbus. Power consumption specifications (9 W main only; 15 W with expansion) reflect this dual-module architecture .
Q6: What are the compatible termination options?
The FBM41 supports:
Q7: What environmental conditions can the FBM41 withstand?
The module operates reliably at 0°C to +60°C with storage from -40°C to +70°C. Humidity range is 5% to 95% non-condensing. It is rated for Class G3 (Harsh) environments per ISA S71.04 .
Q8: What is the difference between FBM41 and FBM42?
The FBM41 (P0902XA) and FBM42 (P0902XB) are both high-power Contact/DC expansion modules. The FBM41 is the standard variant, while the FBM42 may offer slightly different power or channel specifications. Consult the specific product manual for exact differences.
Q9: What are typical applications for the FBM41?
The module is commonly used for: high-power actuator control in chemical plants, relay and solenoid driving in oil and gas facilities, emergency shutdown system outputs in power generation, and industrial manufacturing line discrete I/O expansion .
Q10: Is the FBM41 still in production?
The FBM41 (P0902XA) is a discontinued/legacy product. It remains available through aftermarket suppliers as new original or new surplus stock for spare-part replacement in existing I/A Series installations .
Q11: Does this module come with a warranty?
Yes. This offering includes a 1 Year (12-month) Warranty on the module. Verify warranty terms with your supplier before purchase .
