Description
Core Product Summary
The Foxboro FBM207c is a 4-channel temperature input fieldbus module designed for use within Foxboro I/A Series and EcoStruxure Foxboro Distributed Control System (DCS) architectures. It is engineered to accept and process high-precision temperature measurements from thermocouples, resistance temperature detectors (RTDs), resistance transmitters, and millivolt sources.
The module performs local analog-to-digital conversion, cold-junction compensation (for thermocouples), and linearization before transmitting digitized process variables across a redundant 2 Mbps fieldbus network to system control processors. Featuring strict channel isolation and diagnostic capabilities, the FBM207c provides reliable temperature data acquisition for critical industrial thermal monitoring and control loops.
Key Technical Specifications
| Specification Parameter | Verified Value / Detail |
| Product Type | 4-Channel Temperature Input Module (RTD / Thermocouple) |
| System Family | Foxboro I/A Series / EcoStruxure Foxboro DCS (200 Series I/O) |
| Input Channels | 4 isolated and independent channels |
| Supported Input Types | Thermocouples (Types B, E, J, K, N, R, S, T), RTDs (Pt100, Ni120, Cu10), Resistance (0–500 Ω), Millivolts (-100 to +100 mV) |
| Cold Junction Compensation | Built-in automatic cold junction compensation (CJC) for thermocouple inputs |
| A/D Conversion | Independent Sigma-Delta converter per channel |
| Module Power Supply Input | Redundant 24 V DC (+5%, -10%) |
| Power Consumption / Dissipation | 7 W maximum / 4 W heat dissipation (typical for series architecture) |
| Isolation Rating | Withstands 600 V AC for 1 minute between channels and ground |
Detailed Product Overview
The Foxboro FBM207c functions as a specialized frontend measurement unit for temperature-critical industrial processes. Each of its four input channels can be independently configured via system software to accept different sensor types, ranging from common platinum RTDs to specialized noble-metal thermocouples. The module handles internal signal conditioning, linearization curves, andCJ compensation locally, ensuring that raw field measurements are converted accurately before network transmission.
System configuration parameters—such as sensor failure fallback settings, filtering constants, and upscale/downscale open-circuit detection—are managed through the host control environment. Physical installation relies on a modular 200 Series baseplate framework supporting redundant power feeds and dual-pathed 2 Mbps fieldbus communications. Strict channel-to-channel galvanic isolation prevents ground loops and protects internal control networks against high common-mode voltage transients originating from heavy industrial machinery or ungrounded thermal wells.
System Compatibility & Integration Requirements
| Item / Dependency | Verified Compatibility or Requirement | Practical Note |
| Control System Platform | Foxboro I/A Series DCS / EcoStruxure Foxboro DCS | Connects via modular 200 Series baseplate infrastructure. |
| Communication Network | Redundant 2 Mbps fieldbus (Path A and Path B) | Interfaces with system processors (e.g., FCP) seamlessly with automatic path switching. |
| Termination Assemblies (TAs) | DIN-rail mounted TAs with CJC sensors (Compression or Ring-Lug styles) | Interfaced via standard subsystem transition cables up to 30 meters long; TA selection must match thermocouple or RTD wiring requirements. |
| Environmental Enclosure | Certified for harsh environments up to ISA Standard S71.04 Class G3 | Designed with a ruggedized housing suited for industrial plant spaces. |
FBM207c
FBM207c
Dimensions, Mounting & Connection Notes
- Form Factor: Compact modular plug-in card designed to occupy a single slot on a 200 Series modular baseplate.
- Mounting Options: Baseplates mount directly onto standard horizontal DIN rails or inside 19-inch equipment racks.
- Wiring Termination: Thermocouple extension wire or RTD 3/4-wire leads route through a dedicated DIN-rail mounted Termination Assembly (TA) equipped with integrated cold junction compensation elements.
- Hot-Swapping Support: Engineered to allow module removal and insertion under power without disturbing field-side wiring or system communication trunk lines.
FAQ
What is the Foxboro FBM207c?
The Foxboro FBM207c is a 4-channel temperature input fieldbus module used to process thermocouple, RTD, resistance, and millivolt signals within Foxboro distributed control systems.
What sensor types are supported by the FBM207c?
It supports a wide variety of standard thermocouples (such as J, K, T, E, R, S, B, N), RTDs (such as Pt100), millivolt sources, and direct resistance inputs.
How does the module handle cold junction compensation for thermocouples?
It features built-in automatic cold junction compensation utilizing dedicated temperature sensing elements located on the matching DIN-rail termination assembly.
Can the module be replaced while the system is powered on?
Yes, the design permits online module replacement (hot-swapping) without disconnecting field wiring, base power, or network data cables.
Are the input channels isolated from each other?
Yes, each of the four input channels features independent galvanic isolation from other channels and system ground, rated to withstand 600 V AC for one minute.
Start Chat
