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FBM230
FBM230
FBM230

Foxboro FBM230 P0926GU 4-Port Serial Communication Module

  • Model: FBM230 P0926GU
  • Brand: Foxboro (Invensys / Schneider Electric)
  • Series: I/A Series 200 Field Device System Integrator (FDSI) Modules
  • Core Function: Serial device protocol integration
  • Product Type: Serial Communication Fieldbus Module
  • Key Specs: 4 configurable serial ports, RS-232/RS-422/RS-485 support, Modbus device integration capability
  • Condition: New Original / New Surplus
  • ⚠️ Obsolete Model – Limited Stock Available
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Description

Key Technical Specifications

Parameter Value
Product Model FBM230
Ordering Number P0926GU
Manufacturer Foxboro (Invensys / Schneider Electric)
System Platform Foxboro I/A Series DCS / Foxboro Evo
Product Type Field Device System Integrator (FDSI) Module
Communication Ports 4 independent serial ports
Serial Interface RS-232, RS-422, RS-485
Port Configuration Software configurable per port
Communication Protocols Modbus RTU, Modbus ASCII, vendor-specific serial protocols (driver dependent)
Network Topology Point-to-point and RS-485 multidrop
Maximum RS-485 Devices Up to 64 field devices (configuration dependent)
Fieldbus Communication Redundant 2 Mbps I/A Series Fieldbus
Host Interface FCP270, FCP280, ZCP270, FCM100E/FCM100Et
Isolation Serial port electrical isolation
Baud Rate Protocol and driver dependent
Termination Assembly Dedicated FBM230 TA assembly
Power Supply 24 V DC +5 %, −10 % redundant input
Power Consumption 7 W maximum
Heat Dissipation 7 W maximum
Operating Temperature −20 to +70 °C
Storage Temperature −40 to +70 °C
Relative Humidity 5 to 95 % RH, non-condensing
Mounting Foxboro I/A Series 200 baseplate
Dimensions 102 mm × 45 mm × 104 mm
Weight Approximately 284 g

The Foxboro FBM230 P0926GU is a Field Device System Integrator module providing four configurable serial communication ports for integrating third-party devices into Foxboro I/A Series systems. Each port can be configured for RS-232, RS-422, or RS-485 communication standards.

 

Product Introduction

The Foxboro FBM230 P0926GU is a serial communication interface module used in I/A Series DCS installations to connect external field devices through RS-232, RS-422, or RS-485 networks. Typical applications include Modbus RTU meters, analyzers, motor drives, PLCs, and packaged equipment controllers.

The module provides four independent serial channels and transfers device data between third-party equipment and the Foxboro control system. It is commonly retained in operating plants where legacy serial instruments must remain integrated without replacing the complete DCS architecture.

FBM230

FBM230

FBM230

FBM230

Installation & Configuration Guide

 

Stage 1: Pre-Installation Preparation (Approx. 15 minutes)

⚠️ Safety First

  1. Notify the control room before removing the FBM230.
  2. Confirm affected serial-connected devices can tolerate communication interruption.
  3. Place critical equipment into a safe operating state.
  4. Apply lockout/tagout procedures if cabinet power isolation is required.
  5. Wait at least 5 minutes after power removal before handling the module.

Tools Required

  • ESD wrist strap
  • PH1 screwdriver
  • Digital multimeter
  • Wire labels
  • Smartphone for photos
  • Serial communication tester (recommended)

Data Backup

Before removal:

  1. Record:
    • FBM230 model and P0926GU part number
    • Module slot location
    • Serial port assignments
    • Protocol configuration
  2. Photograph:
    • Terminal wiring
    • Shield grounding
    • RS-485 termination resistors
    • Cable routing
  3. Save:
    • Device driver configuration
    • Modbus addresses
    • Baud rate settings
    • Data mapping tables

 

Stage 2: Removing the Old Module (Approx. 10 minutes)

Steps

  1. Open the Foxboro I/A Series cabinet.
  2. Confirm the correct slot.
  3. Label each serial communication cable.
  4. Disconnect wiring from the termination assembly.
  5. Release the module locking mechanism.
  6. Pull the straight outward from the baseplate.
  7. Inspect:
    • Backplane connector pins
    • Cable connectors
    • Dust contamination
    • Mechanical damage

⚠️ Note:
Keep the old until communication testing is complete. Serial communication failures are often caused by configuration differences rather than hardware faults.

 

Stage 3: Installing the New Module (Approx. 15 minutes)

Steps

  1. Wear an ESD strap before handling the replacement module.
  2. Verify:
    • model
    • P0926GU ordering code
    • Compatible termination assembly
    • Correct serial driver support
  3. Configuration Clone (Critical):
    • Match port assignments.
    • Copy RS-232/422/485 settings.
    • Verify baud rate.
    • Verify parity and stop bits.
    • Confirm device addresses.
    • Check RS-485 termination.
  4. Insert the into the baseplate.
  5. Secure module locking tabs.
  6. Reconnect communication wiring.

Self-Checklist

  • P0926GU confirmed
  • Serial ports mapped correctly
  • RS-485 termination verified
  • Shield grounding checked
  • Module seated correctly

 

Stage 4: Power-On & Testing (Approx. 20 minutes)

Pre-Power Check

  1. Verify 24 V DC supply.
  2. Check serial wiring polarity.
  3. Confirm RS-485 A/B lines are not reversed.
  4. Verify communication grounding.

Power-On Steps

  1. Restore cabinet power.
  2. Check status LEDs.
  3. Verify Fieldbus communication.
  4. Confirm module status in Foxboro system management tools.
  5. Test serial communication.
  6. Verify device data updates.
  7. Confirm control logic receives correct values.

⚠️ Troubleshooting Note

  • If communication fails, check baud rate, parity, and address settings first.
  • If only one direction works, inspect RS-485 polarity and termination.
  • If the module is online but data is incorrect, verify device register mapping.

 

Frequently Asked Questions (FAQ)

Q1: Can the Foxboro be hot-swapped?

The replacement procedure depends on the specific I/A Series hardware configuration and plant maintenance rules.

Although some I/A Series systems support online module replacement, serial-connected field devices may lose communication during removal. Confirm the site procedure before replacing an active module.

Q2: What devices can connect to the ?

The connects Foxboro I/A Series systems with serial field devices such as:

  • PLCs
  • Power meters
  • Analyzers
  • Variable frequency drives
  • Package equipment controllers
  • Remote serial instruments

The actual protocol depends on the installed software driver and device configuration.

Q3: Is the obsolete?

The belongs to the mature Foxboro I/A Series hardware family. Many plants continue using these systems, so replacement modules remain required for maintenance and spare inventory management. Availability depends on remaining stock and tested units.

Q4: Are and FBM231 interchangeable?

No.

The is designed for single serial communication applications. The FBM231 provides a redundant version for dual-ported field devices.

Before replacement, verify:

  • Module model
  • Redundancy requirement
  • Serial port configuration
  • Field device communication architecture

Q5: Will replacing the erase my Modbus configuration?

No. The Foxboro control database stores the system configuration, but the replacement module requires correct communication parameters.

Verify:

  • Protocol driver
  • Device address
  • Baud rate
  • Data register mapping
  • Port configuration

A hardware replacement without configuration verification can result in communication timeouts.

Q6: Why is surplus pricing lower than OEM pricing?

Legacy automation modules often enter the market through:

  • Plant shutdown inventory
  • DCS upgrade projects
  • Excess engineering stock
  • Maintenance spare liquidation

Condition should always be clearly identified:

  • New Original / New Surplus: Unused inventory.
  • Factory Sealed: Original unopened packaging when available.
  • Refurbished (tested): Inspected and function-tested before shipment.

Q7: What inspection process should be completed before installing a surplus ?

 

Inbound Inspection & Traceability

  • Verify source documentation.
  • Confirm and markings.
  • Check serial numbers.
  • Inspect enclosure condition.
  • Confirm no corrosion, scratches, repair marks, or contamination.
  • Audit accessories.

 

Live Functional Testing

Test environment:

  • Genuine Foxboro I/A Series FBM test rack.

Testing steps:

  • Power-up LED verification.
  • Fieldbus communication test.
  • RS-232 communication test.
  • RS-485 communication test.
  • Modbus data exchange verification.
  • Continuous operation monitoring.
  • Test report generation.

 

Electrical Parameter Testing

  • Insulation resistance test using 500 V Megger where applicable.
  • Ground continuity check.
  • Serial port isolation verification.

 

Firmware & Configuration Verification

  • Record hardware revision.
  • Document module identification.
  • Save communication configuration.
  • Photograph labels and connectors.

 

Final QC & Packaging

  • QC inspector sign-off.
  • Anti-static ESD bagging.
  • Bubble wrap protection.
  • Heavy-duty corrugated boxing.
  • QC Passed label with inspection date.

Q8: What are the most common replacement mistakes?

❗ The most common mistake is replacing the module without documenting serial communication settings.

I have seen maintenance teams install a replacement correctly, but the connected PLC or analyzer would not communicate because the old RS-485 parameters were not recorded.

Common issues:

  • Wrong baud rate.
  • Incorrect parity settings.
  • RS-485 polarity reversed.
  • Missing termination resistor.
  • Incorrect Modbus register mapping.

Take photos before removal and record every communication parameter. Those checks prevent most serial integration delays.

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