Foxboro FBM231 Field Device System Integrator Module

Configured for serial communication data acquisition in I/A Series DCS platforms, the Foxboro FBM231 P0926GV (FBM231 Communication Interface Module) provides direct physical execution of multi-port RS-232, RS-422, and RS-485 device interfacing.

Hardware Specifications

4-20 mA HART Loop Protocol

The FBM231 integrates into the I/A Series control network to facilitate advanced field device communication. While the module acts as a bridge for serial protocols, it maintains compatibility with the overarching DCS communication architecture. The design supports the routing of HART protocol data encapsulated within serial streams, provided the end devices are configured for such exchange. Channel-to-channel isolation is maintained within the serial interface circuitry to protect the module backplane from field-originated surges. Proper cold junction compensation (CJC) is not applicable to these digital serial interfaces, but the module provides robust shielding against noise, ensuring data integrity across the RS-485 buses when scaling up to 64 dual-ported devices.

Frequently Asked Questions

Q: Can the FBM231 be mounted in both horizontal and vertical orientations?

A: Yes, the FBM231 mounts on a standard Modular Baseplate, which supports both horizontal and vertical mounting on a 32 mm or 35 mm DIN rail or within a standard 19-inch rack using the appropriate mounting kit.

Q: Is the module capable of supporting redundant power inputs?

A: The module is designed to accept a redundant 24 VDC (+5%, -10%) power supply input, ensuring operational continuity in the event of a single power rail failure.

Field Installation Guidelines

1. Ensure the Modular Baseplate is firmly fixed to the DIN rail or rack system before inserting the FBM231 to prevent mechanical strain on the bus connectors.
2. When utilizing RS-485 buses, ensure proper line termination is applied at both ends of the segment to prevent signal reflections that can degrade communication speed.
3. Keep serial communication cables separated from high-current power cables to minimize induced electromagnetic interference.
4. Verify all wiring connections at the Termination Assembly (TA) for secure physical contact, adhering to standard industrial electrical practices for shielding and grounding.
5. Perform an initial communication diagnostic test via the I/A Series workstation to verify that port settings match the address and baud rate requirements of the connected field devices.