Description
Core Product Summary
The Foxboro RH101AB (part designation for the Compact FBM214b) is an 8-channel HART communication analog input interface module engineered for the EcoStruxure Foxboro DCS and I/A Series Compact 200 Series I/O subsystem. It accepts up to eight 4 to 20 mA DC analog input signals while simultaneously supporting bidirectional digital communication via Frequency Shift Keying (FSK) for HART-compliant field instruments.
Each channel is individually isolated from other channels, ground, and module logic, featuring dedicated FSK modems that execute digital data transfers without interrupting primary analog measurement loops. Operating on redundant 24 V DC system power and communicating via dual 2 Mbps fieldbus paths, the Compact FBM214b (RH101AB) delivers high-accuracy process variable acquisition and real-time HART device management within a space-saving physical enclosure.
Key Technical Specifications
| Specification Parameter | Verified Value / Detail |
| Product Model / Part Number | Compact FBM214b / RH101AB |
| System Architecture | EcoStruxure Foxboro DCS / I/A Series (Compact 200 Series I/O) |
| Module Type | 8-Channel HART Communication Analog Input Interface |
| Input Channels | 8 individually isolated channels |
| Supported Signal Formats | Standard 4 to 20 mA DC analog signals; Superimposed digital HART FSK (HART 5, 6, and 7) |
| Dedicated Channel Modems | 1 FSK modem per channel for concurrent HART communication |
| Analog-to-Digital Converter | Independent Sigma-Delta converter per channel (100 ms update rate) |
| Input Resistance | 282 Ω (Externally Powered loop) / 302 Ω (Internally Powered loop) |
| Internal Field Loop Supply | Isolated 24 V DC ±10% per channel (current limited to <37 mA) |
| Power Consumption / Dissipation | 7 W to 8.4 W maximum consumption / 4 W heat dissipation |
| Channel Isolation Rating | Galvanic isolation rated for 600 V AC withstand for 1 minute |
| Operating Temperature & Humidity | -20°C to +60°C (-4°F to +140°F); 5% to 95% RH (non-condensing) |
| Environmental Certification | Class G3 (Harsh) environment compliant per ISA Standard S71.04 |
Detailed Product Overview
The Foxboro RH101AB (Compact FBM214b) acts as a high-density measurement gateway for industrial process facilities utilizing HART-enabled smart transmitters. By incorporating an independent Sigma-Delta A/D converter alongside a dedicated FSK modem on every channel, the unit acquires high-resolution analog input values updated every 100 milliseconds while concurrently processing digital HART diagnostic, secondary process, and device status data.
The module supports both 2-wire internally powered field loops and 4-wire externally powered devices. For 2-wire transmitters, the module provides an internally isolated, current-limited 24 V DC loop power supply rated to restrict short-circuit currents to under 37 mA. Physical installation uses a narrow-width form factor designed for high channel density per cabinet, reducing space requirements on Compact 200 Series baseplates while maintaining full Class G3 environmental protection.
Dimensions, Mounting & Connection Notes
- Module Dimensions: 130 mm (5.12 in) Height × 25 mm (0.98 in) Width × 150 mm (5.90 in) Depth.
- Unit Mass: Approximately 185 g (6.5 oz).
- Mounting Configuration: Snaps directly onto a Compact 200 Series 16-slot horizontal baseplate mounted on standard 35 mm DIN rails or 19-inch racks.
- Field Termination: Field wiring terminates at a separate DIN-rail mounted Termination Assembly (TA) connected to the baseplate via Type 1 multi-core subsystem cables.
- Hot-Swapping Provision: Supports live module insertion and removal under power on active baseplates without disturbing field wiring or network communications.
FBM214b RH101AB
FBM214b RH101AB
System Compatibility & Integration Requirements
| Item / Dependency | Verified Compatibility or Requirement | Practical Note |
| System Platform | EcoStruxure Foxboro DCS / I/A Series | Requires Control Core Services v9.0, I/A Series v8.8, or later system software supporting Compact 200 Series definitions. |
| Mounting Infrastructure | Compact 200 Series 16-Slot Horizontal Baseplate | Installs into horizontal baseplate slots supporting dual 2 Mbps fieldbus communications and redundant 24 V DC power feeds. |
| Field Termination Assemblies | DIN-rail mounted Termination Assemblies (TAs) | Interfaces via Type 1 multi-core subsystem cables up to 30 meters in length (available in PVC or Low Smoke Zero Halogen materials). |
| Configuration Environment | Foxboro Control Software / PC20 IFDC / HART Handhelds | Managed through system engineering tools or standard HART configurators using the module’s built-in loop resistance. |
FAQ
What is the relationship between model designations FBM214b and RH101AB?
FBM214b is the functional module description (Compact 8-Channel HART Input Interface Module), while RH101AB is the specific Foxboro part number for this Compact 200 Series module.
Can non-HART analog devices be connected to the RH101AB?
Yes. Each channel independently accepts standard 4 to 20 mA DC analog signals from non-HART sensors, as well as digital FSK signals superimposed on 4 to 20 mA loops from HART-compliant field instruments.
Does the RH101AB module provide loop power to field transmitters?
Yes. The module provides an internally isolated 24 V DC power supply per channel limited to less than 37 mA, suitable for powering 2-wire transmitters directly through the termination assembly.
How are field signals connected to the Compact FBM214b?
Field signals connect to a DIN-rail mounted Termination Assembly (TA), which links to the Compact 200 Series baseplate using Type 1 subsystem cables up to 30 meters long.
Is the module rated for harsh industrial environments?
Yes. The unit features conformal coating and is certified for use in ISA S71.04 Class G3 (Harsh) environmental conditions.
Start Chat
