Description
The Foxboro FBM202 (Part Number: P0926EQ) is a high-performance fieldbus interface module designed for the EcoStruxure Foxboro DCS (formerly I/A Series) architecture. This module serves as a specialized analog input interface that converts low-level signals from thermocouples or millivolt (mV) sources into digital data for the process control network.
The FBM202 is part of the 200 Series Fieldbus Modules, which are renowned for their ruggedness, galvanic isolation, and high density. It is specifically engineered to provide extreme accuracy in temperature measurement, incorporating advanced cold-junction compensation and signal filtering to ensure stable performance in harsh industrial environments.
FOXBORO FBM202 P0926EQ
Product Parameters (Datasheet)
The technical specifications for the P0926EQ are as follows:
| Parameter | Specification |
| Model Number | FBM202 |
| Part Number | P0926EQ |
| Input Channels | 8 Isolated Channels |
| Input Signal Types | Thermocouples (Type B, E, J, K, N, R, S, T) and -100 to +100 mV |
| A/D Conversion | 15-bit Resolution |
| Accuracy | Typical ±0.03% of Span |
| Input Impedance | >10 MΩ |
| Galvanic Isolation | 600 V AC (Channel-to-Bus and Channel-to-Earth) |
| Integration Time | 16.7 ms or 20 ms (Software selectable) |
| Power Consumption | 2 W (Maximum) @ 24 V DC |
| Regulatory Compliance | CE, UL/CSA, ATEX (Zone 2), G3 (Corrosive environments) |
| Operating Temperature | -20°C to +70°C (-4°F to +158°F) |
Technical Description & Features
- High Channel Isolation: Each of the 8 channels is galvanically isolated. This prevents ground loops and ensures that a fault or surge on one sensor does not propagate to other channels or the central control processor.
- Automatic Cold-Junction Compensation (CJC): The module, when paired with the appropriate termination assembly (TA), provides automatic compensation for the temperature at the connection terminals, ensuring the thermocouple reading remains precise regardless of ambient temperature swings.
- Digital Filtering: The FBM202 utilizes advanced noise rejection algorithms to eliminate 50/60 Hz interference, which is critical when measuring the very small voltage changes generated by thermocouples.
- Open Sensor Detection: The module continuously monitors the integrity of the field wiring. If a thermocouple wire breaks, the system immediately flags the data as “Bad” and triggers a system alarm to prevent control errors.
- Rugged Enclosure: The module is housed in a high-density, impact-resistant plastic casing designed for DIN-rail mounting via the Foxboro baseplate system.
Country of Origin
- Primary Origin: United States (USA)
Installation & Usage Guidelines
- Baseplate Integration: The FBM202 must be installed onto a Foxboro 200 Series baseplate (e.g., P0926KE). The module utilizes a high-reliability connector that supports “Hot Swapping,” allowing the module to be replaced while the system is powered.
- Termination Assemblies: To connect field wiring, the FBM202 requires a compatible Termination Assembly (TA). For thermocouple applications, a TA with an integrated CJC sensor (like the P0916BT) is essential for accurate temperature measurement.
- Software Setup: Within the Foxboro control software (IACC or Control Editor), the user must define the “FBM Type” and specify the thermocouple type (e.g., Type K) for each channel. Scaling from mV to Temperature is handled automatically by the module’s internal firmware.
- Wiring: Use shielded thermocouple extension wire that matches the thermocouple type. Ensure the shield is grounded at the termination assembly to minimize electromagnetic interference.
FOXBORO FBM202 P0926EQ
Recommended Related Foxboro (Schneider Electric) Models
To expand or complement a system utilizing the FBM202, the following 200 Series modules and components are frequently used:
- FBM203 (P0926ER): An 8-Channel RTD (Resistance Temperature Detector) Input Module, ideal for high-precision temperature sensing where thermocouples are not used.
- FBM201 (P0914SQ): An 8-Channel 0-20 mA Analog Input Module for standard pressure and flow transmitters.
- FBM214 (P0922VT): A Discrete Input Module for monitoring 24 V DC contact closures.
- FCP270 (P0917CP): The Field Control Processor that manages data from the FBMs and executes the primary control logic.
- P0926KE / P0926HM: 8-position or 2-position baseplates used for mounting the FBM202 and other 200 Series modules.
- FBM242 (P0916TA): External Source Discrete Output Module for driving field relays and solenoids.
