Foxboro FBM231 - Analog Output Module for Foxboro I/A Series Control Systems

Foxboro FBM231 – Analog Output Module for Foxboro I/A Series Control Systems

In stock

Product Introduction:
The Foxboro FBM231 is a 16-channel analog output module for the Foxboro I/A Series distributed control system. The “FBM231” designation identifies this module as a high-accuracy analog output board that converts digital values from the I/A Series controller into precise 4-20mA or 0-10V signals for controlling field devices such as control valves, dampers, and variable speed drives. This module provides per-channel isolation, fail-safe output configuration, and continuous self-diagnostics. It is essential for any application where the DCS must directly control a field actuator with high precision and reliability.

Technical Specifications:
Board Type: Analog Output Module
System: Foxboro I/A Series (Series 1, 2, 3)
Channels: 16 independent analog output channels
Output Signals: 4-20mA (2-wire) or 0-10V (4-wire) per channel configurable
Resolution: 16-bit D/A conversion
Accuracy: +/- 0.05% of full scale
Linearity: +/- 0.01% of full scale
Update Rate: 250 milliseconds simultaneous update for all 16 channels
Isolation: 500V RMS channel-to-channel and channel-to-ground
Output Current: Up to 50mA per channel (4-20mA loop-powered)
Fail-Safe Configuration: Configurable to output 0mA, 4mA, or hold last value on communication loss
LED Indicators: Per-channel red/green LEDs show output status and fault conditions
Power: 5V DC from I/A Series backplane
Form Factor: 3U Eurocard
Operating Temperature: 0 to 60 degrees Celsius

Functional Features:
Simultaneous Update: All 16 outputs update at the exact same instant, critical for multi-valve control where timing mismatch causes process upset.
Per-Channel Isolation: Each output is electrically isolated from every other output, preventing ground loops and cross-talk.
Fail-Safe Configuration: Each channel independently configurable to output a safe value (0mA or 4mA) on communication loss, ensuring valves fail to a known safe position.
Current Sourcing and Sinking: Supports both 2-wire (loop-powered) and 4-wire (externally powered) transmitter configurations.
Burnout Detection: Detects open or shorted field wiring and alarms the controller immediately.
Watchdog Timer: Forces all outputs to a safe state on communication loss.
LED Status Indicators: Bright per-channel LEDs allow instant visual verification of output status.