Description
Key Technical Specifications
| Parameter | Value |
|---|---|
| Product Model | FBM214B |
| Ordering Number | P0927AH |
| Manufacturer | Foxboro (Invensys / Schneider Electric) |
| System Platform | Foxboro I/A Series DCS |
| Product Type | HART Communication Input Module |
| Input Channels | 8 individually isolated analog input channels |
| Analog Input Signal | 4-20 mA DC |
| Digital Communication | HART FSK signal superimposed on 4-20 mA loop |
| HART Compatibility | HART Version 5, 6, and 7 compliant devices |
| HART Communication Mode | Point-to-point, master/slave, asynchronous, half-duplex |
| HART Baud Rate | 1200 baud |
| HART Message Rate | Up to 2 messages per second |
| Input Accuracy | ±0.03 % of full scale |
| Resolution | 15-bit Sigma-Delta conversion |
| Sense Resistance | 61.5 Ω nominal |
| Total Input Resistance | 280 Ω nominal |
| Update Rate | 100 ms |
| Integration Time | 500 ms |
| Common Mode Rejection | >100 dB at 50/60 Hz |
| Normal Mode Rejection | >35 dB at 50/60 Hz |
| Loop Supply | 24 V DC ±10 % per channel |
| Minimum Compliance Voltage | 18.5 V DC at 20.5 mA |
| Communication Interface | I/A Series redundant Fieldbus |
| Fieldbus Speed | 2 Mbps |
| Power Consumption | 7 W maximum |
| Heat Dissipation | 4 W maximum |
| Operating Temperature | −20 to +70 °C |
| Storage Temperature | −40 to +70 °C |
| Humidity | 5 to 95 % RH, non-condensing |
| Mounting | I/A Series modular baseplate |
| Module Dimensions | 102 × 45 × 104 mm |
| Module Weight | Approximately 284 g |
The Foxboro FBM214B P0927AH is an I/A Series HART communication input module with eight isolated 4-20 mA channels. It allows the Foxboro DCS to acquire analog process values while communicating with smart HART field instruments for diagnostics and configuration data.
Product Introduction
The Foxboro FBM214B P0927AH is an 8-channel HART analog input Fieldbus Module designed for Foxboro I/A Series distributed control systems. It interfaces with smart transmitters measuring pressure, flow, temperature, and level while maintaining standard 4-20 mA process signal acquisition.
Each input channel includes isolated HART communication capability, allowing engineers to access transmitter diagnostics and device information without interrupting the primary control signal. The module is commonly maintained in legacy process plants where I/A Series DCS hardware remains operational.

FBM214B P0927AH

FBM214B P0927AH
Installation & Configuration Guide
Stage 1: Pre-Installation Preparation (Approx. 10 minutes)
⚠️ Safety First
- Notify the control room before removing the FBM214B.
- Confirm affected loops are placed in a safe operating condition.
- Apply lockout/tagout procedures if cabinet access requires power isolation.
- Remove module power and wait at least 5 minutes before handling connections.
Tools Required
- ESD wrist strap
- PH1 screwdriver
- Digital multimeter
- Wire labels
- Smartphone for configuration photos
Data Backup
Before replacement:
- Record the module model and ordering number:
- FBM214B
- P0927AH
- Photograph:
- Module position
- Termination assembly
- Field wiring
- Document:
- Channel assignments
- Transmitter tags
- HART device addresses
- I/O database configuration
- Save current DCS configuration records.
Stage 2: Removing the Old Module (Approx. 10 minutes)
Steps
- Open the I/A Series cabinet.
- Verify the correct FBM214B slot location.
- Label each transmitter connection.
- Disconnect termination wiring carefully.
- Release the module retaining mechanism.
- Pull the module straight outward from the baseplate.
- Inspect the connector pins and mounting area.
⚠️ Note:
Keep the original until the replacement has completed HART communication and analog input verification. Legacy I/A Series systems depend on correct module location and termination hardware.
Stage 3: Installing the New Module (Approx. 10 minutes)
Steps
- Wear an ESD strap before handling the replacement module.
- Verify:
- Model:
- Part Number: P0927AH
- Correct termination assembly
- Compatible Fieldbus configuration
- Configuration Clone (Critical):
- Match module slot position.
- Verify all eight input channels.
- Confirm 4-20 mA scaling.
- Verify HART device assignments.
- Confirm loop power configuration.
- Insert the into the baseplate.
- Secure the module locking mechanism.
- Reconnect field wiring.
Self-Checklist
- P0927AH verified
- Termination assembly checked
- Transmitter wiring confirmed
- HART settings documented
- Module seated correctly
Stage 4: Power-On & Testing (Approx. 15 minutes)
Pre-Power Check
- Verify 24 V DC module supply.
- Check transmitter loop polarity.
- Confirm no shorts exist on input terminals.
Power-On Steps
- Restore cabinet power.
- Observe FBM status LEDs.
- Verify Fieldbus communication.
- Check module health status in the I/A Series workstation.
- Confirm 4-20 mA input values.
- Verify HART communication with field devices.
- Check transmitter diagnostic data.
⚠️ Troubleshooting Note
- If analog values are incorrect, verify loop wiring and scaling.
- If HART communication fails, check loop resistance and device address.
- If the module does not communicate, inspect Fieldbus termination and addressing.
Frequently Asked Questions (FAQ)
Q1: Can the Foxboro be hot-swapped?
Some Foxboro I/A Series configurations support online replacement, but this depends on the installed baseplate, termination hardware, and system revision. Confirm the site replacement procedure before removing an active module.
Because the provides loop power and HART communication, incorrect removal procedures can interrupt transmitter communication.
Q2: Is the obsolete?
The belongs to the Foxboro I/A Series product family. It is a mature module used in many installed systems. Availability depends mainly on remaining inventory, surplus stock, and tested refurbished units.
Q3: What type of field devices can connect to ?
The supports:
- Standard 4-20 mA transmitters
- HART-enabled pressure transmitters
- HART-enabled flow transmitters
- HART-enabled temperature transmitters
- HART-enabled level instruments
Supported HART instruments comply with HART Version 5, 6, or 7 specifications.
Q4: Will replacing erase my transmitter configuration?
No. The Foxboro DCS configuration database stores the control strategy and I/O definitions. However, the replacement module must match:
- Slot location
- Channel assignment
- Signal scaling
- HART configuration
Always document the original settings before removal.
Q5: What is the difference between and a standard analog input module?
The adds HART communication capability.
A standard analog input module mainly reads the 4-20 mA process value. The can also communicate with smart instruments to retrieve:
- Device status
- Diagnostic information
- Configuration parameters
- Secondary variables
This allows maintenance teams to access transmitter information without installing separate HART tools.
Q6: Why is surplus pricing lower than OEM pricing?
Legacy DCS modules are often sourced from:
- Plant spare inventory
- Project cancellation stock
- System upgrade programs
- Equipment retirement inventory
A lower price does not define the condition. Confirm whether the unit is:
- New Original / New Surplus: Unused inventory.
- Factory Sealed: Original unopened packaging when available.
- Refurbished (tested): Function-tested after inspection.
Q7: What inspection process should be completed before installing a surplus ?
A professional inspection process should include:
Inbound Inspection & Traceability
- Verify source documentation.
- Confirm model and label.
- Check serial number markings.
- Inspect enclosure condition.
- Confirm no corrosion, scratches, repair marks, or contamination.
- Audit accessories.
Live Functional Testing
Test environment:
- Genuine Foxboro I/A Series FBM test rack.
Testing steps:
- Power-up LED verification.
- Fieldbus communication test.
- 4-20 mA signal simulation.
- HART communication verification.
- Eight-channel input testing.
- Continuous operation monitoring.
- Test report generation.
Electrical Parameter Testing
- Insulation resistance testing where applicable.
- Ground continuity verification.
- Input channel electrical checks.
Firmware & Configuration Verification
- Record hardware revision.
- Document module identification.
- Save test records.
- Photograph labels and connectors.
Final QC & Packaging
- QC inspector sign-off.
- Anti-static ESD bagging.
- Bubble wrap protection.
- Heavy-duty corrugated boxing.
- QC Passed label with inspection date.
Q8: What are the most common replacement mistakes?
❗ The most common mistake is treating the as a simple analog input module and ignoring HART configuration.
I have seen maintenance teams restore the 4-20 mA signal correctly but lose HART diagnostics because loop resistance, wiring, or configuration settings were not verified.
Common issues:
- Incorrect termination assembly.
- Missing HART device configuration.
- Wrong transmitter loop wiring.
- Incorrect channel mapping.
- Ignoring Fieldbus addressing.
Document the original configuration before removal. For legacy Foxboro systems, accurate records save more time than troubleshooting after installation.

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