FOXBORO P0926AH-B

Product Introduction:
The P0926AH-B is a Field Bus Module (FBM) belonging to the Foxboro I/A Series distributed control system. It provides eight galvanically isolated analog input channels accepting standard 4–20 mA process signals and simultaneously acting as a HART communication host, allowing the DCS to read digital HART data (PV, SV, TV, device status) from smart field transmitters.
Category:
Description
Technical Specifications:
  • Input Channels:​ 8 × isolated analog inputs, grouped 4+4
  • Signal Type:​ 4–20 mA DC (supports live zero / HART superimposition)
  • Input Impedance:​ Approx. 250 Ω (HART-compatible termination)
  • Accuracy:​ ±0.1% of full scale typical
  • Resolution:​ 16-bit A/D conversion
  • HART Support:​ HART 5/6/7 — reads up to 2 digital messages/sec per channel; supports Universal, Common Practice, and Device-Specific commands (burst mode not supported)
  • Power:​ Supplied from Foxboro FCP (Field Control Processor) backplane; optional external excitation per channel group
  • Isolation:​ 500 V channel-to-backplane; channel groups isolated in pairs
  • Operating Temp:​ 0 °C to +60 °C
  • Mounting:​ Snap-in to Foxboro I/A Series FBM base (e.g., FBM base assemblies with redundant bus)
Features:
  • Galvanic isolation prevents ground-loop errors in multi-transmitter loops
  • Integrated HART master enables asset management via Foxboro InTouch / AMS
  • Software-configurable per-channel alarm limits, linearization, square-root extraction
  • Compatible with redundant FCP configurations for high availability
Applications:​ Continuous process plants — chemical, pharmaceutical, power, pulp & paper — for pressure, flow, level, and temperature transmitter signal acquisition with smart device management.
Installation Notes:​ Ensure shield drain wires are grounded at one point (typically at the marshalling terminal block, not at the FBM). Verify loop power supply polarity and that HART modem filters are not inline.
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