Description
Core Product Summary (Brand / Model / Key Attributes)
The Foxboro FBM211 is a 16-channel 0 to 20 mA Analog Input Module for the Foxboro I/A Series and EcoStruxure Foxboro DCS 200 Series I/O subsystem. It accepts current signals from 2-wire transmitters, self-powered 20 mA sources, or line-monitored digital inputs with end-of-line resistors and converts them for transmission over the redundant module Fieldbus.
Channels are organized as two groups of eight, with each group galvanically isolated from ground and module logic. The module uses a multiplexed Sigma-Delta converter, supports configurable conversion time and rate-of-change limits, and is rated for Class G3 harsh environments.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | 0 to 20 mA Analog Input Module |
| Input Channels | 16 group-isolated and independent channels |
| Input Range (each channel) | 0 to 20.4 mA DC (current limited to 33 mA) |
| Accepted Signal Sources | 2-wire 4–20 mA transmitters, self-powered 20 mA sources, line-monitored digital inputs with EOL resistors |
| Accuracy (includes linearity) | ±0.03 % of span |
| Accuracy Temperature Coefficient | ±50 ppm/°C |
| A/D Conversion | Multiplexed Sigma-Delta converter shared by all channels |
| Update Capability | New readings every 100 ms (integration period configurable) |
| Common Mode Rejection | >100 dB at 50 or 60 Hz |
| Normal Mode Rejection | >35 dB at 50 or 60 Hz |
| Input Channel Impedance | 61.9 Ω nominal |
| Isolation | Group isolation (groups of 8) from ground and module logic |
| Power Supply (Redundant) | 24 V DC +5 % / –10 % |
| Power Consumption | 7 W maximum at 24 V DC; 11 W maximum with all inputs at 20.4 mA (internal power) |
| Heat Dissipation | 3 W maximum |
| Communication | Redundant 2 Mbps module Fieldbus |
| Application Program | Analog Input with configurable Conversion Time and Rate of Change Limits |
| Environmental Rating | Suitable for Class G3 (harsh) environments |
| Typical Part Number | P0914TN / RH914TN (and related revisions) |
Detailed Product Overview
The Foxboro FBM211 provides high-density analog current input for process measurement loops. Each of the 16 channels accepts a standard 0–20.4 mA signal and is current-limited to 33 mA for protection. The channels are arranged in two groups of eight; each group is galvanically isolated from system ground and from the module’s internal logic, reducing the impact of ground loops and common-mode noise.
Signal conversion is performed by a multiplexed Sigma-Delta analog-to-digital converter that serves all channels. This architecture supports update intervals as short as 100 ms while allowing the integration period to be configured in software to reject process noise or power-line frequencies. The module executes the standard Analog Input application program, which also provides configurable rate-of-change limits.
Field devices may be powered by the module (via the termination assembly) or by an external supply. Dedicated termination assemblies support both configurations and include the necessary current-limiting and protection circuitry. The FBM211 communicates with the associated Fieldbus Communications Module or Field Control Processor over the redundant 2 Mbps module Fieldbus and is designed for Class G3 harsh industrial environments.
Engineering Selection Highlights
- Select FBM211 when high channel density (16 inputs) for 0–20 mA signals is required in a single module slot.
- Confirm that the application can accept group isolation (two groups of eight) rather than full channel-to-channel isolation.
- Match the termination assembly to the power scheme (module-powered or externally powered transmitters).
- Use the configurable integration period to optimize noise rejection versus update rate for the process.
- Account for the higher power draw (up to 11 W) when all channels are at full scale with internal loop power.
- Verify that the control software is configured for the Analog Input application program with the desired conversion time and rate-of-change limits.
- Ensure field wiring and shielding practices keep common-mode voltages within the module’s rejection capability.
FBM211
FBM211
Dimensions, Mounting & Connection Notes
The FBM211 is a standard 200 Series Fieldbus Module form factor (approximately 102–114 mm high × 45 mm wide × 104 mm deep including mounting features). It mounts on a DIN-rail or modular baseplate. Field wiring is terminated on a dedicated termination assembly that may be local or remote. Separate termination assemblies are available for module-powered and externally powered transmitters. Adequate ventilation should be provided, especially when internal loop power is used at high channel loading. Installation follows normal 200 Series practices and must remain within Class G3 environmental limits.
System Compatibility & Integration Requirements
| Item / Dependency | Verified Compatibility or Requirement | Practical Note |
|---|---|---|
| System Family | Foxboro I/A Series / EcoStruxure Foxboro DCS | 200 Series Fieldbus Module subsystem |
| Fieldbus | Redundant 2 Mbps module Fieldbus | Connects to FCM or FCP |
| Power Supply | Redundant 24 V DC +5 % / –10 % | Up to 11 W when using internal loop power |
| Termination Assembly | Compatible TA for module-powered or external-powered transmitters (e.g., P0916BT/BU or P0916JT/PQ series) | Required for field wiring and protection |
| Isolation Scheme | Group isolation (8 channels per group) | Not full channel-to-channel isolation |
| Application Program | Analog Input | Configurable conversion time and Rate of Change Limits |
| Environmental | Class G3 (harsh) | Suitable for industrial process areas |
FAQ
What is the Foxboro FBM211?
The Foxboro FBM211 is a 16-channel 0 to 20 mA analog input module that converts current signals from field transmitters for use in the I/A Series and EcoStruxure Foxboro DCS.
How many channels does it have and how are they isolated?
It has 16 channels arranged in two groups of eight. Each group is galvanically isolated from ground and module logic.
What input range is supported?
0 to 20.4 mA DC per channel, with each channel current-limited to 33 mA.
What is the accuracy?
±0.03 % of span, with a temperature coefficient of ±50 ppm/°C.
Does the module support HART?
The base FBM211 is a standard analog input module. HART-capable variants exist in the broader 200 Series family (for example FBM214), but the FBM211 itself is specified for analog current signals.
What power consumption should be planned for?
7 W maximum under normal conditions; up to 11 W when all channels operate at 20.4 mA with internal loop power.
What environmental rating does it have?
It is designed for Class G3 (harsh) industrial environments.
Verification & Troubleshooting Notes
- Confirm module identity by the FBM211 designation and part number on the label and by successful recognition on the Fieldbus.
- Verify that the correct termination assembly is installed for the chosen power scheme (module-powered or external).
- Check that the 24 V DC redundant supply is present and within tolerance; monitor total current when internal loop power is used.
- Review the configured integration period if noise or slow response is observed.
- Confirm that common-mode voltages remain within the module’s rejection capability (>100 dB at line frequency).
- Channel status and diagnostic information are available through the control system; open or over-range conditions are reported accordingly.
- Module replacement should be performed only after verifying power, Fieldbus integrity, and correct termination assembly matching.
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