Description
The FOXBORO FBM216B is a sophisticated 8-channel analog input module within the Foxboro I/A Series distributed control system, specifically engineered for high-precision temperature measurement applications using resistance temperature detectors (RTDs). This specialized fieldbus module provides accurate and reliable conversion of RTD signals to digital values for temperature monitoring and control purposes. The FOXBORO FBM216B supports various RTD types including Pt100, Pt200, Pt500, and Pt1000 sensors with multiple wire configuration options (2-wire, 3-wire, and 4-wire), allowing flexibility in sensor selection and installation. Each channel features individual signal conditioning, excitation current sources, and advanced noise rejection capabilities that ensure accurate temperature measurement even in electrically noisy industrial environments.
Designed for critical temperature monitoring applications, the FOXBORO FBM216B incorporates high-resolution measurement circuitry and automatic lead resistance compensation that eliminates measurement errors caused by wiring resistance. The module features comprehensive diagnostic capabilities that monitor sensor health, wiring integrity, and module performance, providing early detection of sensor failures or wiring problems. The FOXBORO FBM216B is engineered for seamless integration with Foxboro’s control strategies and asset management solutions, enabling sophisticated temperature control algorithms while providing maintenance teams with valuable diagnostic information. Its high channel density and advanced features make it particularly suitable for applications where precise temperature monitoring is critical for process quality, equipment protection, or safety considerations.

FBM216B FOXBORO
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | FBM216B |
| Manufacturer | FOXBORO (Emerson) |
| Product Type | 8-Channel RTD Input Module |
| Input Channels | 8 individually isolated channels |
| Supported RTD Types | Pt100, Pt200, Pt500, Pt1000 (α=0.00385) |
| Wire Configurations | 2-wire, 3-wire, 4-wire (software selectable) |
| Measurement Range | -200°C to +850°C (all RTD types) |
| Resolution | 0.1°C (24-bit effective resolution) |
| Accuracy | ±0.2°C (±0.1% of reading) |
| Excitation Current | 0.5mA constant current source per channel |
| Lead Resistance Compensation | Automatic for 3-wire and 4-wire configurations |
| Update Rate | 500 ms per channel (all channels) |
| Common Mode Rejection | >120 dB at 50/60 Hz |
| Normal Mode Rejection | >80 dB at 50/60 Hz |
| Isolation | 500V AC channel-to-channel and field-to-system |
| Diagnostic Features | Sensor break detection, short circuit detection |
| Status Indication | Per-channel LED indicators |
| Power Supply | 5V DC from fieldbus (FBM bus) |
| Power Consumption | 2.8W typical |
| Operating Temperature | -40°C to +70°C |
| Storage Temperature | -40°C to +85°C |
| Relative Humidity | 5% to 95% non-condensing |
| Safety Standards | UL, cUL, ATEX, IECEx |
| EMC Compatibility | Meets IEC 61326 industrial requirements |
| Connection Type | Removable terminal block |
| MTBF | >450,000 hours per IEC 61709 |
Main Features and Advantages
The FOXBORO FBM216B offers several advanced features specifically designed for precision temperature measurement applications. High-accuracy measurement: The module provides exceptional measurement accuracy of ±0.2°C with 0.1°C resolution, ensuring precise temperature monitoring for critical processes. Flexible sensor support: With support for multiple RTD types and wire configurations, the FOXBORO FBM216B offers installation flexibility and compatibility with existing sensor infrastructures. Automatic lead resistance compensation eliminates measurement errors in 3-wire and 4-wire configurations, ensuring accurate readings regardless of cable length or resistance.
Advanced diagnostic capabilities include sensor break detection, short circuit identification, and out-of-range monitoring, enabling proactive maintenance and reducing downtime. Individual channel isolation prevents cross-talk between measurement circuits and protects the system from field-side electrical faults. The FOXBORO FBM216B features excellent noise rejection characteristics, maintaining measurement accuracy even in electrically noisy environments. Software-based configuration allows easy setup of RTD type, wire configuration, and measurement parameters without hardware modifications. The module also supports hot-swappable replacement when proper procedures are followed, minimizing process disruption during maintenance activities. These features combine to make the FOXBORO FBM216B an ideal solution for reliable and accurate temperature measurement in process automation systems.
Application Field
The FOXBORO FBM216B is extensively used in process industries where precise temperature monitoring is critical for process control, product quality, and equipment protection. In chemical processing plants, the module is employed for reactor temperature monitoring, distillation column control, and heat exchanger performance monitoring. The FOXBORO FBM216B is crucial in oil and gas facilities for pipeline temperature monitoring, vessel temperature control, and compressor protection systems. In power generation facilities, the module serves critical functions for bearing temperature monitoring, winding temperature measurement, and heat rate calculation in turbines and generators.
The pharmaceutical industry utilizes the FOXBORO FBM216B for critical process temperature monitoring in bioreactors, sterilization processes, and product drying operations where temperature accuracy affects product quality and regulatory compliance. In food and beverage processing, the module monitors pasteurization temperatures, cooking processes, and storage conditions throughout production facilities. The FOXBORO FBM216B is also found in metals production for furnace temperature control, rolling mill temperature monitoring, and heat treatment processes. The module’s high channel density makes it particularly suitable for applications where multiple temperature points are concentrated in specific areas, such as reactor systems, heat transfer units, or machinery protection systems where comprehensive temperature monitoring is essential for safe and efficient operation.

FBM216B FOXBORO
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