Foxboro 2AX-ALM-AR Alarm Annunciator Module

Product Type: Discrete Alarm Processing and Annunciation Module

Overview:
The Foxboro 2AX-ALM-AR is a dedicated alarm annunciator module designed for the Foxboro I/A Series Distributed Control System (DCS). It processes discrete alarm inputs, provides alarm prioritization, and drives annunciator outputs to alert operators of abnormal process conditions. The module is installed in a standard I/A Series chassis and communicates with the system controller via the I/A Series backplane.

Category:
Description

Functional Features:

  • Accepts up to 32 discrete alarm input points per module
  • Provides four alarm priority levels (Critical, High, Medium, Low)
  • Supports alarm shelving and suppression functionality
  • Includes alarm acknowledgment and reset logic
  • Delivers visual annunciation via front-panel LED indicators and system-wide alarm displays
  • Supports alarm logging and historical recording within the I/A Series historian
  • Implements deadband and delay-on/delay-off timer configurations for each input

Technical Specifications:

  • Input Type: Dry contact (form C) or 24 VDC discrete signals
  • Input Voltage Range: 12 VDC to 48 VDC (dry contact) or 24 VDC nominal (wet contact)
  • Input Current: ≤ 5 mA per channel
  • Alarm Priority Levels: 4 configurable levels
  • Scan Rate: 250 ms typical per channel
  • Operating Temperature: 0°C to +60°C (+32°F to +140°F)
  • Humidity Rating: 5% to 95% non-condensing
  • Power Supply: +5 VDC from I/A Series backplane
  • Module Dimensions: Standard I/A Series half-width card
  • Weight: Approximately 0.3 kg (0.66 lb)

Applicable Industries:
Oil and Gas, Chemical Processing, Power Generation, Pulp and Paper, Water and Wastewater Treatment, Pharmaceutical Manufacturing

Installation Requirements:

  • Installed in a standard I/A Series I/O chassis (e.g., I/A Series IOCAR or IOCHAS)
  • Requires backplane connection for power and communication
  • Field wiring connected via terminal blocks on the front or rear of the chassis
  • Must be configured via I/A Series Control Builder software

Advantages:

  • High-speed alarm processing with deterministic scan rates
  • Configurable alarm logic eliminates need for external annunciator panels
  • Fully integrated with I/A Series DCS historian and operator stations
  • Redundant alarm database maintained by the system controller
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