Technical Specifications
Key Features & Benefits
High-Power Output Switching
The FBM42 is specifically designed to drive external loads requiring substantial current. Each output channel supports 2.25 A steady-state current with a 12 A short-circuit load capacity, 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 (exceeding surge or steady-state current), the module opens the circuit for approximately 64.5 line cycles (~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 FBM42 provides 8 fully isolated digital input channels and 8 fully isolated digital output channels. Input channels support both contact sense (dry contacts) 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 .
Fast Discrete Signal Processing
The module processes discrete switching signals with a response time of 2–5 milliseconds, ensuring rapid execution of control commands for time-sensitive applications such as turbine control and emergency shutdown systems .
Comprehensive LED Diagnostics
The FBM42 features 18 front-panel LEDs: 1 red and 1 green for operational status, 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 .
Compact Rugged Construction
The module features a compact design with rugged housing for physical protection. It is designed for mounting in standard I/A Series FBM carrier assemblies and is suitable for harsh industrial environments .
Recommended Related Models
Compatible I/A Series Components:
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Main Module Required: FBM42 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 FBM42 (P0902XB)?
The FBM42 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 FBM42?
Each output channel supports 2.25 A steady-state current with a 12 A short-circuit load capacity. The module is designed for direct high-power switching without interposing relays .
Q3: What input signal types does the FBM42 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 64.5 line cycles (~1 second) and then automatically retries. This cycle can repeat indefinitely to protect the module from external load faults. Only overloads exceeding 50 A cause permanent physical damage .
Q5: Is the FBM42 a main module or expansion module?
The FBM42 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 (13 W main only; 23 W with expansion) reflect this dual-module architecture .
Q6: What are the compatible termination options?
The FBM42 supports:
Q7: What environmental conditions can the FBM42 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 .
Q8: What is the switching speed of the FBM42?
The module processes discrete switching commands in 2–5 milliseconds, enabling rapid response for time-critical control applications .
Q9: What are typical applications for the FBM42?
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: 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 .
