Product Description

The FOXBORO FBM202​is a 4-channel,isolated Analog Input Fieldbus Module(FBM)for the Foxboro I/A Series distributed control system.It is designed to interface with a variety of field sensors,providing high-accuracy acquisition and conditioning of analog signals such as 4-20 mA,thermocouple(TC),and resistance temperature detector(RTD)inputs.This module serves as a remote,intelligent I/O node,extending the DCS’s measurement capabilities directly into the field or local equipment enclosures.

Application Scenario

In a pharmaceutical bioreactor suite,maintaining precise jacket temperature and vessel pressure is critical for cell culture viability.Running individual analog cables from each sensor back to a central control room is costly and introduces noise.Instead,a FOXBORO FBM202​module is installed in a local junction box near the reactor.It connects to two RTDs for jacket temperature and two 4-20mA pressure transmitters.The module provides the precise excitation current for the RTDs and digitizes all four signals with high accuracy.Using FOUNDATION Fieldbus,it transmits the fully scaled,engineering-unit values digitally to the control system over a single twisted-pair cable.When a cooling valve began to stick,causing a slight temperature oscillation,the high-resolution data from the FBM202​allowed the advanced process control(APC)software to detect the specific frequency of the limit cycle.This diagnostic insight,derived from the clean signal provided by the module,enabled predictive maintenance to replace the valve before it caused a batch deviation.The FBM202’s role as a high-fidelity,distributed data acquisition point was crucial in transforming raw sensor data into actionable intelligence for predictive health monitoring.

Key Parameters

Main Parameters

Value/Description

Product Model​

FOXBORO FBM202​

Manufacturer​

Foxboro(an Emerson business)

Product Category​

Fieldbus Module(FBM)-Analog Input

System Compatibility​

Foxboro I/A Series DCS

Number of Channels​

4,configurable per channel

Input Types​

Software-selectable:4-20 mA,Voltage,Thermocouple(J,K,T,E,etc.),RTD(Pt100,Ni120)

Isolation​

1500 Vrms channel-to-channel and channel-to-fieldbus.

Accuracy​

High accuracy,e.g.,±0.05%of span for 4-20 mA inputs.

Update Rate​

Configurable per channel to balance speed and noise rejection.

Fieldbus Protocol​

FOUNDATION Fieldbus H1(31.25 kbps)

Power​

Powered directly from the fieldbus segment.

Environmental Rating​

Suitable for harsh industrial environments.

Technical Principles and Innovative Values

Universal,Software-Configurable Input Channels:​The FBM202’s core innovation is its universal channel design.Each of the four channels can be independently configured via software for a wide range of sensor types without hardware changes.A channel can be set for 4-20mA today and reconfigured for a Type J thermocouple tomorrow.This flexibility drastically simplifies engineering,spare parts inventory,and system modifications,allowing a single module type to serve diverse measurement needs throughout a plant.

Intelligent Signal Processing at the Edge:​The module performs significant signal conditioning and processing locally.For thermocouples,it applies high-accuracy cold-junction compensation.For RTDs,it provides a stable excitation current and linearization.It also executes digital filtering to remove noise.By delivering clean,fully processed engineering-unit values over the fieldbus,it reduces the computational load on the controller and ensures that only high-integrity data enters the control system,improving loop performance and data reliability.

True Distributed Control with Embedded Function Blocks:​As a native FOUNDATION Fieldbus device,the FBM202​supports standard function blocks.This means control strategies,such as a single-loop PID,can be executed within the module itself.The Analog Input(AI)block reads the sensor,and a PID block can compute the output,which is then sent to a neighboring FBM203​(Analog Output)module.This enables true distributed control where loops are closed at the field level,increasing system responsiveness and availability,as the loop can operate even if communication to the higher-level controller is lost.

Application Cases and Industry Value

Case Study:Offshore Oil Platform Production Separator Control

An offshore platform needed to upgrade the control of its three-phase production separator(oil,water,gas).The existing system used long analog runs susceptible to lightning-induced surges.The retrofit used FOUNDATION Fieldbus with FOXBORO FBM202​modules mounted in Ex-i(intrinsically safe)enclosures at the vessel.Each module interfaced with level,pressure,and interface level sensors.The platform’s control systems engineer reported:”Deploying the FBM202​modules locally was a game-changer.We eliminated over 5 kilometers of analog cable,saving significant weight and cost.The modules’immunity to lightning transients solved a chronic problem.We implemented the level and pressure control loops using the PID function blocks in the FBM202s​themselves.During a severe storm that disrupted the control network,these critical loops continued to operate autonomously,preventing a production shutdown.The diagnostic capabilities also let us identify a drifting pressure transmitter before it affected control.”This case highlights the module’s value in reducing installation costs,enhancing reliability in harsh environments,and enabling resilient,distributed control architectures that maximize production uptime.

Related Product Combination Solutions

The FOXBORO FBM202​operates within the I/A Series fieldbus ecosystem:

FOXBORO FBM203​(Analog Output Module):The complementary output module used to command control valves or variable speed drives based on signals processed from the FBM202​inputs.

FOXBORO FBM204​(Digital Input/Output Module):Provides discrete I/O for permissives,alarms,and on/off control in the same fieldbus segment.

FOUNDATION Fieldbus Power Supply&Conditioner:​Provides power and signal conditioning for the fieldbus segment,linking multiple FBM​modules.

Foxboro I/A Series Controller(e.g.,FCP270):​The higher-level controller that can coordinate multiple fieldbus segments,run advanced control strategies,and provide the HMI interface for loops distributed to the FBM202.

Fieldbus Junction Box:​Provides the physical connection and termination point for the fieldbus spur cables connecting to the FBM202​and other devices.

Emerson AMS Device Manager:​The asset management software used to configure,calibrate,and monitor the health and performance of every FBM202​module in the plant.

Installation,Maintenance,and Full-Cycle Support

Installation involves mounting the module on a DIN rail within a suitable enclosure,connecting the field wiring to its terminals,and connecting it to the fieldbus segment via a trunk or spur cable.Configuration is performed using the I/A Series engineering tools or AMS Device Manager,where each channel’s type,range,and function block linkages are defined.

Maintenance is simplified by the module’s remote diagnostics.Calibration,ranging,and channel configuration can be performed remotely.The modular design allows for replacement with minimal disruption.Our support provides genuine,factory-configured FOXBORO FBM202​modules.We assist in selecting the correct version for your environmental and area classification needs.We provide technical documentation and guidance on integrating these modules into your I/A Series or DeltaV system.We are your partner in building reliable,intelligent distributed I/O networks that enhance process control and operational insight.

Distribute intelligence and reliability to the field level.Contact us for a genuine FOXBORO FBM202 analog input module and expert support for your I/A Series fieldbus architecture.

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