Foxboro AO2 Analog Output Module | Replacement, Equivalent & Selection Guide
The Foxboro AO2 is a field-proven Analog Output Module designed for the Foxboro I/A Series Distributed Control System (DCS). It delivers precise 4–20 mA analog output signals to final control elements such as control valves, positioners, and variable-speed drives. This page provides full technical specifications, compatible replacement options, and a structured selection guide to help engineers and procurement teams make confident sourcing decisions.
Technical Specifications
- Model: AO2
- Manufacturer: Foxboro (Schneider Electric)
- Series: I/A Series DCS
- Module Type: Analog Output
- Output Channels: 2 channels (typical)
- Output Signal: 4–20 mA (current loop)
- Resolution: 12-bit D/A conversion
- Isolation: Channel-to-channel and channel-to-bus isolation
- Communication Bus: Nodebus / Fieldbus (I/A Series backplane)
- Power Supply: Supplied via DCS backplane
- Operating Temperature: 0°C to 60°C
- Weight: Approx. 2,450 g (with housing)
- Compliance: CE, UL listed (verify with current datasheet)
Compatible Replacement & Equivalent Models
When the original AO2 is discontinued or unavailable, the following models are commonly evaluated as functional replacements. Always verify backplane compatibility and firmware revision before substitution.
- Foxboro AO4 – 4-channel analog output; direct I/A Series backplane fit; expanded channel count
- Foxboro AO8 – 8-channel variant; suitable for high-density output applications
- Foxboro FBM242 – FOUNDATION Fieldbus analog output; requires fieldbus segment infrastructure
- Foxboro FBM207 – HART-enabled analog output; compatible with HART field devices
- Emerson DeltaV AO Card – Cross-platform option; requires DeltaV migration project
- Honeywell HC900 AO Module – Third-party equivalent for hybrid control architectures
Note: Cross-brand replacements require engineering validation. Contact Konmask for compatibility assessment.
Why Choose the Original Foxboro AO2
- Proven Reliability: Decades of field deployment in refining, petrochemical, and power generation industries
- Seamless Integration: Native I/A Series backplane compatibility — no gateway or protocol converter required
- Minimal Reconfiguration: Drop-in replacement maintains existing loop configurations and calibration data
- OEM Quality: Factory-tested to Foxboro specifications; full traceability documentation available
- Long Service Life: Robust industrial-grade components rated for continuous 24/7 operation
Typical Applications
- Control valve positioner signal output in oil & gas processing
- Variable-speed drive (VSD/VFD) speed reference in power plants
- Analog setpoint transmission in chemical batch processes
- Flow control loops in water treatment and utilities
- Temperature and pressure regulation in pharmaceutical manufacturing
System Compatibility
- DCS Platform: Foxboro I/A Series (all generations)
- Backplane: I/A Series FCP270, CP60, CP30 control processors
- Software: Foxboro IACC / FoxCAE configuration tools
- Field Wiring: Standard 4–20 mA two-wire or four-wire loops
- HART Protocol: Not native on AO2; see FBM207 for HART support
Selection Guide
Use the criteria below to confirm the AO2 is the right module for your application, or to identify the best alternative:
- Channel Count: Need exactly 2 analog outputs? → AO2 is optimal. Need 4 or 8? → Consider AO4 / AO8.
- Protocol: Standard 4–20 mA? → AO2. HART required? → FBM207. FOUNDATION Fieldbus? → FBM242.
- Backplane Slot: Confirm existing slot type (standard I/A Series FBM slot) before ordering.
- Firmware Version: Match firmware to your CP processor version to avoid compatibility issues.
- Budget vs. Lead Time: New OEM units offer full warranty; refurbished units reduce cost with shorter lead time.
Quality Assurance & Sourcing
- All units sourced through authorized distribution channels or verified surplus inventory
- Pre-shipment functional testing available upon request
- Certificate of Conformance (CoC) and test reports provided
- Secure anti-static packaging with full traceability labeling
- Minimum 90-day warranty on all refurbished units; 12-month warranty on new OEM stock
How to Order
- Confirm your part number: Foxboro AO2 (include revision suffix if known, e.g., AO2-A)
- Specify quantity and required delivery timeline
- Request a quote via support@konmask.com or add directly to cart
- Provide your DCS processor model for compatibility pre-check (optional but recommended)
- Receive order confirmation with lead time and tracking information within 24 hours
Replacement & Compatibility FAQ
Q: Can the AO2 be replaced with an AO4 without reconfiguration?
A: In most cases yes — the AO4 occupies the same backplane slot and the additional channels are simply unused. Verify with your I/A Series system engineer.
Q: Is the Foxboro AO2 still in production?
A: The AO2 is a legacy module. Schneider Electric (Foxboro) may offer limited new stock; refurbished and surplus units are widely available through Konmask.
Q: What is the lead time for the AO2?
A: In-stock units ship within 3–5 business days. Out-of-stock units typically have a 2–6 week lead time depending on sourcing.
Q: Can I use a third-party replacement in my I/A Series system?
A: Third-party modules require engineering validation and may void system warranties. Contact Konmask for a compatibility assessment before substitution.
Q: Do you provide testing reports?
A: Yes. Functional test reports and CoC documents are available upon request for all units.
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