How many serial ports are available on Foxboro FBM231?

It provides four independently configurable serial I/O ports.

Which electrical interfaces can Foxboro FBM231 use?

Each port can be configured for RS-232, RS-422 or RS-485 service.

How is redundancy implemented for Foxboro FBM231?

Two modules operate as a Master/Tracker pair with shared field termination.

How many RS-485 devices can Foxboro FBM231 access?

The manufacturer states that an FBM231 can access up to 64 devices in RS-485 mode.

Which baud-rate range is supported by Foxboro FBM231?

Its serial ports support rates from 300 through 115200 baud.

How many DCI connections can Foxboro FBM231 support?

The redundant module pair supports up to 2,000 DCI connections.

Which supply is required by Foxboro FBM231?

The module uses redundant 24 V DC input at +5 percent and -10 percent.

What proves commissioning of Foxboro FBM231?

Verify all four ports, every addressed device and mapped value, then witness Master/Tracker failover without losing required communications.

FBM231

Name: FBM231
Brand: Invensys
SKU: FBM231

Serial Interface Module

Product image is representative; revision or series may vary. Contact us to request a specific version.

Product Describe：

FBM231 is a redundant four-port serial field-device integrator for RS-232, RS-422 and RS-485 instruments in a Foxboro DCS 200 Series subsystem.

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Technical specifications for FBM231

Manufacturer:

Invensys
Product Category:

DCS Systems
Spare Part Number:

FBM231
Estimated shipping dimensions:

4.5x11x11.5cm
Weight:

0.36 kg
Tariff Code:

8537101190
Counliy of origin:

USA
Current module part number:

P0926GV
Operating arrangement:

Redundant Master / Tracker pair
Serial ports:

4 independently configurable
Physical interfaces:

RS-232, RS-422 or RS-485
RS-485 device capacity:

Up to 64 devices per module
Direct RS-232/422 capacity:

Up to 4 devices
DCI capacity:

Up to 2,000 connections
Baud range:

300 to 115200 baud
Module Fieldbus:

Redundant 2 Mbps
Input supply:

24 V DC +5%, -10%
Maximum consumption:

7 W per module

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Information

Overview Manuals Common Applications Product Precautions

Foxboro FBM231 forms a Master/Tracker pair that concentrates serial device data into the redundant 2 Mbps Module Fieldbus while keeping each of its four ports independently configurable.

4 configurable serial ports
RS-232 / RS-422 / RS-485
Master/Tracker redundancy
Up to 2,000 DCI connections

Each port is configured for the required physical interface, baud rate and device protocol. The paired modules share a termination arrangement, and failover must preserve every port map, device address and DCI connection.

Important Notice: FBM231 is the module designation; the current manufacturer module part number is P0926GV. Confirm the installed revision, termination assembly and cable type before replacement.

Foxboro FBM231 Manuals & Downloads

Foxboro FBM231 Technical Reference (PDF)Foxboro FBM231 Manufacturer Manual Excerpt (PDF)

The technical reference organizes exact characteristics and engineering boundaries. The manufacturer excerpt presents selected unchanged official pages used for exact-model review.

Serial instrument integration

Collects data from supported serial field devices through four configured ports.

Redundant protocol gateway service

Maintains serial communications through a Master/Tracker module pair.

Legacy device concentration

Maps supported serial process data into the Foxboro control database.

Multi-drop RS-485 networks

Connects addressed instruments through approved RS-485 topology and termination.

Foxboro FBM231 installation checks: retain the exact identity, installed configuration and witnessed acceptance record throughout the work.

Confirm FBM231, P0926GV and both module revisions.

Export all four port protocols, baud rates, addresses and DCI maps.

Place affected loops and serial devices in the approved safe state.

Identify Master and Tracker positions before disturbing baseplate hardware.

Label each TA conductor, shield and serial interface assignment.

Restore the pair in adjacent odd/even baseplate positions.

Verify port electrical mode and termination before energizing devices.

Prove failover, every device response and all mapped values before release.

Technical notes

For FBM231, retain the exact manufacturer identity, installed connection record and witnessed model-specific acceptance result.

FAQ View All FAQ

How many serial ports are available on Foxboro FBM231?

It provides four independently configurable serial I/O ports.
Which electrical interfaces can Foxboro FBM231 use?

Each port can be configured for RS-232, RS-422 or RS-485 service.
How is redundancy implemented for Foxboro FBM231?

Two modules operate as a Master/Tracker pair with shared field termination.
How many RS-485 devices can Foxboro FBM231 access?

The manufacturer states that an FBM231 can access up to 64 devices in RS-485 mode.

Which baud-rate range is supported by Foxboro FBM231?

Its serial ports support rates from 300 through 115200 baud.
How many DCI connections can Foxboro FBM231 support?

The redundant module pair supports up to 2,000 DCI connections.
Which supply is required by Foxboro FBM231?

The module uses redundant 24 V DC input at +5 percent and -10 percent.
What proves commissioning of Foxboro FBM231?

Verify all four ports, every addressed device and mapped value, then witness Master/Tracker failover without losing required communications.

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