Description
FOXBORO FBM202 P0926EQ Product Description
Product Overview
FOXBORO FBM202 P0926EQ is an 8-channel isolated thermocouple/mV input module belonging to the Foxboro I/A Series FBM200 family. It is designed to acquire low-level temperature and millivolt signals from field instruments and convert them into digital process data for the Foxboro control system. Each of the eight input channels is galvanically isolated, helping reduce ground-loop effects and improve measurement integrity in electrically noisy industrial environments.
The FOXBORO FBM202 P0926EQ also incorporates an isolated RTD reference-junction channel for thermocouple cold-junction compensation. The module supports thermocouple/mV signal conditioning, burnout detection and configurable signal-processing functions, then communicates with the associated FCM or FCP through the redundant 2 Mbps module Fieldbus.
For legacy Foxboro I/A Series installations, FBM202 P0926EQ provides a compact and reliable interface between temperature instrumentation and the DCS. The current Foxboro documentation identifies P0926EQ as the earlier part number, superseded by RH926EQ, which is important when sourcing replacement hardware.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | FBM202 P0926EQ |
| Manufacturer | Foxboro / Schneider Electric |
| Product Series | I/A Series FBM200 |
| Product Type | Thermocouple / mV Input Module |
| Number of Inputs | 8 isolated channels |
| Input Signal | Thermocouple and millivolt |
| Thermocouple Types | J, K, T, E, N, S, R, B and other supported types |
| Reference Junction | 1 isolated RTD reference input |
| Input Impedance | 10 MΩ differential |
| CJC Accuracy | Approx. ±0.50°C with Foxboro termination RTD |
| Thermocouple Conformity | Approx. ±0.25°C |
| mV Accuracy | Approx. ±0.03% of span at 25°C |
| Common-Mode Voltage | Up to 30 VAC / 60 VDC |
| Fieldbus | Redundant 2 Mbps module Fieldbus |
| Power Supply | 24 VDC redundant |
| Power Consumption | Approx. 3 W maximum |
| Mounting | FBM200/200 Series baseplate |
| Termination | DIN-rail or baseplate termination assembly |
| Operating Temperature | Up to −20 to +70°C, enclosure dependent |
| Part Number | P0926EQ |
| Replacement Reference | RH926EQ |
The current Foxboro product specification identifies the FBM202 as an 8-channel thermocouple/mV module, with RH926EQ superseding P0926EQ. It also specifies approximately −20 to +70°C operating temperature, 102 × 45 × 104 mm module dimensions and approximately 284 g module weight.
Main Features and Advantages
8-Channel Isolated Temperature Measurement
The FOXBORO FBM202 P0926EQ provides eight independent thermocouple/mV input channels. Galvanic isolation between channels and ground helps prevent interference and ground-loop problems when multiple field sensors operate at different electrical potentials.
Multi-Type Thermocouple Support
The module can interface with commonly used thermocouple types, including J, K, T, E, N, R, S and B. This makes one module suitable for different temperature-monitoring points within the same process-control cabinet.
FBM202 P0926EQ
Integrated Cold-Junction Compensation
An isolated RTD reference-junction input provides temperature reference information for thermocouple measurement. When used with the specified Foxboro termination assembly, the reference-junction measurement accuracy is approximately ±0.50°C.
Thermocouple Burnout Detection
The FBM202 incorporates up-scale burnout detection, allowing the control system to identify an open thermocouple circuit and distinguish an instrumentation fault from a legitimate process-temperature condition.
High-Impedance mV Measurement
With approximately 10 MΩ differential input impedance, the module places relatively little loading on low-level signal sources. This is useful for thermocouple and millivolt measurements where signal amplitude is small and susceptibility to electrical interference is comparatively high.
Redundant Module-Bus Communication
The module communicates with its associated FCM or FCP through a redundant 2 Mbps module Fieldbus, providing the digital communication path between field signal conditioning and the higher-level Foxboro control architecture.
Maintainable Modular Design
The FBM202 is installed on an FBM200-series baseplate and uses dedicated termination assemblies. Foxboro’s architecture separates field wiring from the electronics, making module replacement and cabinet maintenance more manageable. The current specification also indicates that the module mounts on a baseplate that can be installed on DIN rail or in a 19-inch rack with the appropriate mounting hardware.
Application Fields
FOXBORO FBM202 P0926EQ is primarily used for temperature and low-level analog measurement in Foxboro I/A Series process-control systems. It is particularly appropriate where thermocouples are distributed throughout a plant and reliable temperature acquisition is required at the DCS level.
In chemical and petrochemical plants, the module can monitor reactor temperatures, distillation columns, heat exchangers, furnaces and process piping. Its isolated inputs and thermocouple burnout detection are useful where many temperature sensors operate in electrically demanding environments.
In oil and gas facilities, FBM202 P0926EQ can acquire thermocouple signals from compressors, heaters, separators, process vessels and other equipment. Accurate temperature information can be used by the DCS for process regulation, alarm generation and equipment protection.
In power generation and metallurgy, the module can monitor boiler, furnace, turbine auxiliary and high-temperature process equipment. Its support for multiple thermocouple types allows different sensor technologies to be incorporated within a common I/O architecture.
The module is also applicable to pulp and paper, pharmaceutical manufacturing, food processing, water treatment and general process automation, particularly where a large number of temperature points must be integrated into an existing Foxboro I/A Series DCS.
For replacement projects, it is important to verify the exact hardware revision and termination assembly. Foxboro documentation identifies RH926EQ as the successor to P0926EQ, so the newer part should only be treated as a replacement after confirming system compatibility.
Related Products
- RH926EQ — Current/successor part number for the FBM202 module; Foxboro documentation states that it supersedes P0926EQ.
- FBM201 — Related Foxboro FBM200-series analog input module for different field-signal applications.
- FBM203 — Related FBM200-series analog input module with a different signal-conditioning function.
- FBM204 — Related Foxboro analog input module for process measurement applications.
- FBM205 — FBM200-series analog input hardware for other analog signal types.
- FBM206 — Related I/A Series analog input module used for compatible process instrumentation.
- FCM — Foxboro Fieldbus Communication Module that provides the communication interface between FBM I/O and the control system.
- FCP — Foxboro Field Control Processor that communicates with the FBM subsystem and executes control functions.
- FBM200 Series Baseplate — Mechanical and electrical mounting platform for the FBM202 and associated modules.
- FBM202 Termination Assembly — Field-wiring interface used to connect thermocouples and mV signals to the FBM202.
