FOXBORO FBM230 Serial Communication Module

Product Series: I/A Series Foundation Fieldbus Module

Product Introduction:
The FBM230 is a dual-port serial communication interface module for the Foxboro I/A Series DCS. It provides RS-232 and RS-485 communication capabilities, enabling the controller to interface with legacy devices, RTUs, PLCs, and other serial devices using Modbus RTU/ASCII protocols.

Category:
Description

Technical Specifications:

  • Number of Ports2 independent serial ports
  • Port A: RS-232 (DB-9 connector)
  • Port B: RS-232 or RS-485 (configurable via DIP switches)
  • Baud Rate: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200 bps
  • Data Bits: 7 or 8
  • Parity: None, Even, Odd
  • Stop Bits: 1 or 2
  • Protocol SupportModbus RTU, Modbus ASCII, DF1 Master/Slave
  • Max Cable Length (RS-485): 1200 meters at 9600 bps
  • Max Cable Length (RS-232): 15 meters at 19200 bps

Functional Features:

  • Simultaneous dual-port communication with independent configuration
  • Modbus master and slave operation on each port
  • DF1 protocol support for Allen-Bradley device communication
  • Auto-baud detection capability
  • Built-in 15kV ESD protection on all serial ports
  • Optical isolation on RS-485 port (500V isolation)
  • Diagnostic LEDs for TX, RX, and fault status per port

Performance Parameters:

  • Isolation Voltage (RS-485)500V RMS between port and backplane
  • Isolation Voltage (RS-232)250V RMS between port and backplane
  • MTBF: Greater than 150,000 hours
  • Operating Temperature: 0°C to 60°C (32°F to 140°F)
  • Storage Temperature: -40°C to 85°C (-40°F to 185°F)
  • Relative Humidity: 5% to 95% non-condensing

Material Composition:

  • Chassis: Galvanized steel with epoxy powder coating
  • PCB: FR-4 glass epoxy, conformal coated
  • Connectors: DB-9, gold-plated contacts
  • Isolation Barriers: Opto-isolators with silicone encapsulation

Structural Features:

  • Form Factor: Standard I/A Series module, single-width
  • Mounting: DIN rail or chassis mounting via backplane connector
  • Dimensions (W x H x D): 25.4mm x 160mm x 120mm (approximate)
  • Weight: Approximately 0.35 kg (0.77 lb)

Working Principle:
The FBM230 uses UART (Universal Asynchronous Receiver/Transmitter) chips with opto-isolation barriers for RS-485 communication. Data is received from the serial port, buffered in on-board FIFO memory, and transferred to the I/A Series backplane via the system bus interface. The module operates as a protocol translator, converting between serial data frames and I/A Series internal data format.

Advantages & Highlights:

  • Dual independent ports allow simultaneous communication with two different devices
  • Wide baud rate range supports both legacy and modern serial devices
  • Optical isolation provides excellent noise immunity in industrial environments
  • DF1 protocol support enables direct integration with Allen-Bradley PLCs

Applicable Industries:

  • Oil and Gas
  • Chemical Processing
  • Power Generation
  • Water Treatment
  • Manufacturing (batch and continuous)

Installation Requirements:

  • Mount in a location free from electromagnetic interference (EMI) sources
  • Use shielded twisted-pair cable for RS-485 connections
  • Terminate RS-485 bus with 120Ω resistor at both ends
  • Ensure proper ground reference for RS-232 connections
  • Configure DIP switches before powering up

Usage Precautions:

  • Do not exceed 115200 bps on RS-232 ports
  • Do not mix RS-232 and RS-485 devices on the same bus without proper conversion
  • Verify baud rate, parity, and stop bit settings match the connected device
  • Use surge protectors for outdoor or lightning-prone installations
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