Product Overview
The Foxboro FBM203, part number RH914SV (legacy P0914SV), is an 8-channel Platinum/Nickel/Copper RTD Input Interface Module for the I/A Series and Foxboro Evo Distributed Control Systems. Each input channel accepts a 2-wire or 3-wire RTD sensor within a 0 to 320 ohm resistance range. The module performs the signal conversion required to interface electrical resistance signals from field RTD sensors to the optionally redundant 2 Mbps Fieldbus .
The FBM203 executes an analog input application program providing conversion time (per module basis) and configurable options for Rate of Change Limits. Each analog input is galvanically isolated from other channels and ground, withstanding 600 V AC for 1 minute . The module is widely deployed in oil and gas, chemical processing, power generation, and water treatment facilities for precise temperature measurement applications.
Technical Specifications
Compatible Termination Assemblies (TAs)
Note: The P0916DC termination cable (3 m) is required to connect DIN rail-mounted TAs to the FBM baseplate.
Key Features & Benefits
Eight Isolated RTD Input Channels
The FBM203 provides 8 fully isolated, independent RTD input channels, each accepting Platinum, Nickel, or Copper resistance temperature detectors. The per-channel galvanic isolation withstands 600 V AC for one minute, preventing ground loops, field faults, and cross-channel interference from propagating through the system .
High-Accuracy Sigma-Delta Conversion
Each channel incorporates an independent Sigma-Delta converter providing new analog input values every 25 ms, with a configurable integration period to remove process noise and power line frequency interference. This architecture delivers ±0.1% reading accuracy, making the FBM203 suitable for precise temperature measurement in critical process loops .
100 Series FBM03A Functionality Support
When used with a 3-wire RTD input, the FBM203 supports the functionality of the legacy 100 Series FBM03A module. This enables phased migration from older I/A Series installations without re-engineering field wiring or control strategies .
Redundant Fieldbus Architecture
The module independently connects to the redundant 2 Mbps Fieldbus. If one Fieldbus path is unsuccessful or switched at the system level, the module continues communication over the active path without process interruption .
Configurable Rate of Change Limits
The analog input application program provides configurable options for Rate of Change Limits, allowing engineers to detect abnormal temperature excursions and suppress noise-induced false alarms in temperature monitoring applications .
Rugged Industrial Construction
The module features a rugged extruded aluminum exterior for physical protection of circuits. It is rated for Class G3 (Harsh) environmental conditions per ISA S71.04, suitable for corrosive chemical plants, coastal installations, and other demanding industrial settings .
Multiple Termination Assembly Options
The FBM203 supports both DIN rail-mounted TAs (compression screw or ring lug) and baseplate-mounted TAs (FBM203/b/c only). Termination cables are available in lengths up to 30 meters (98 feet), allowing flexible cabinet layout and remote TA mounting .
Recommended Related Models
Compatible I/A Series Components:
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Control Processors: CP60, FCP270, FCP280
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Termination Cable: P0916DC (Type-1, 3 m)
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Termination Assemblies: RH916XJ, RH924WN, P0917JM
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Fieldbus Communication Modules: FCM10E, FCM2F2
Frequently Asked Questions (FAQ)
Q1: Is the P0916DC the FBM203 module?
No. The P0916DC is a Type-1 termination cable (3 m, 37-pin D-Sub) used to connect the FBM203 baseplate to a field termination assembly. The FBM203 module part number is RH914SV (supersedes P0914SV). Always verify that your supplier is providing the correct item .
Q2: What is the primary function of the Foxboro FBM203?
The FBM203 is an 8-channel RTD input module for the I/A Series and Foxboro Evo DCS. It accepts resistance signals from Platinum, Nickel, or Copper RTD sensors, performs signal conversion, and transmits digitized temperature data to the control processor over the redundant Fieldbus .
Q3: What RTD sensor types does the FBM203 support?
The module supports Platinum, Nickel, and Copper RTD sensors. Each channel accepts a 2-wire or 3-wire RTD configuration within a 0 to 320 ohm resistance range .
Q4: What is the accuracy and conversion rate of the FBM203?
The module provides ±0.1% reading accuracy with a Sigma-Delta converter per channel, providing new analog input values every 25 ms with a configurable integration period .
Q5: What is the difference between FBM203 and FBM203d?
The FBM203 accepts 2-wire or 3-wire RTD inputs with a 0–320 Ω range. The FBM203d accepts 4-wire RTD inputs only, also with a 0–320 Ω range. The FBM203d is supported only by I/A Series software V8.6 to V8.8 or Control Core Services V9.0 or later .
Q6: What termination assemblies are compatible with the FBM203?
DIN rail-mounted TAs: RH916XJ (compression screw, Polyamide) or P0917JM (ring lug, Polyamide). Baseplate-mounted TA: RH924WN (compression screw, PC/ABS) — supported by FBM203/b/c only .
Q7: What is the maximum termination cable length?
Termination cables are available in lengths up to 30 meters (98 feet), allowing the termination assembly to be mounted in either the enclosure or an adjacent enclosure .
Q8: What environmental conditions can the FBM203 withstand?
The module is rated for Class G3 (Harsh) environmental contamination per ISA S71.04. Operating temperature is 0°C to +60°C .
Q9: What is the power consumption of the FBM203?
The maximum power consumption is 8.5 W per non-fault-tolerant module .
Q10: Does this module come with a warranty?
Yes. This offering includes a 1 Year Warranty on the module. Verify warranty terms with your supplier before purchase.
