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The FOXBORO 2AX-ALM-AR ABS Alarm Module is the dual absolute alarm / ABS alarm control module of the Foxboro I/A Series, providing two independent alarm channels with relay output for process-variable monitoring (temperature, pressure, etc.). Per the Foxboro official type-test report (NRC ML13311A278), it is designed for use with the 2AP signal processing module — the combined product code being 2AP+ALM-AR — with alarm channels A and B settable as HI and LO alarms via dial setpoints.
Key Features
- Dual absolute alarm module — two independent alarm channels with separate setpoints
- Relay output for alarm annunciation / control action
- Alarm channels A and B settable as HI and LO alarms
- Dial-set alarm setpoints; accuracy ±2% of dial setting
- Designed for use with the 2AP signal processing module (combined code 2AP+ALM-AR)
- Monitors process variables (temperature, pressure, etc.) and triggers alarm when exceeding thresholds
- 24 V DC supply class
Technical Specifications
- Type Designation: 2AX-ALM-AR
- Product Type: Dual absolute alarm module (ABS alarm control module)
- System: Foxboro I/A Series DCS
- Alarm Channels: 2 (A/B), independently settable as HI / LO
- Setpoint Setting: Dial setting, accuracy ±2%
- Output: Relay (alarm output)
- Companion Module: 2AP signal processing module (combined code 2AP+ALM-AR, per Foxboro)
- Supply Voltage: 24 V DC
- Mounting: Backplane slot (plug-in adapter module)
Installation Notes
- Verify the module combination (2AX-ALM-AR with the 2AP signal processing module) against the I/A Series drawings before installation.
- De-energize the rack before inserting or removing the module; follow ESD precautions.
- Install the module in its designated backplane slot; ensure full seating of the connector.
- Set the alarm setpoints on the dials per the process alarm schedule; set channel A/B HI/LO configuration as required.
- After power-up, verify alarm activation and relay output against the setpoints during commissioning (per the type-test procedure, check both HI and LO channels).
Common Questions
What does the 2AX-ALM-AR do? It provides two independent absolute alarm channels with relay output for process-variable monitoring — the alarm module of a Foxboro I/A Series analog signal-processing pair.
What is it paired with? Per the Foxboro type-test report, it is used with the 2AP signal processing module; the combined product code is 2AP+ALM-AR.
How are the alarms set? Alarm channels A and B are set via dials (accuracy ±2% of dial setting) and can be configured as HI and LO alarms respectively.
What power does it need? 24 V DC.
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