Description
Foxboro FBM214b P0927AH — Product Details
Product Overview
The Foxboro FBM214b P0927AH is an eight-channel HART communication input module designed for distributed control systems used in continuous process industries. It receives 4–20 mA signals from field transmitters and supports HART digital communication over the same signal loop. This lets the control system acquire process measurements while accessing supported digital information from compatible smart instruments. Typical applications include pressure, temperature, flow, and level measurement in chemical processing, power generation, water treatment, and other industrial facilities.
Each input channel is individually isolated from the other channels, ground, and module logic. The module supports a mixture of standard 4–20 mA devices and HART-enabled transmitters, making it useful in installations where conventional instruments and smart field devices operate together. Its dedicated HART interface supports versions 5, 6, and 7, with point-to-point, master/slave, asynchronous half-duplex communication at 1200 baud. The documented communication rate is two messages per second. HART burst communication mode is not supported, so projects that depend on burst-mode behavior should be checked before deployment.
For engineering evaluation, the Foxboro FBM214b P0927AH has a specified input accuracy of ±0.03% of full scale, 15-bit resolution, and a 100 ms input update rate. The standard module uses a redundant 2 Mbps module fieldbus connection to communicate with its associated Fieldbus Communication Module or Control Processor. Individual channel loop supplies can power compatible transmitters; external loop power is also supported under the specified wiring arrangements. When multiple channels share a common external supply, the manufacturer specifies the use of a cable balun to help prevent HART signal crosstalk.
For replacement planning, P0927AH is the earlier designation associated with RH927AH. That relationship is a useful identification reference, but it does not remove the need to verify the exact installed module generation. Check the baseplate, termination assembly, termination cable, field power arrangement, and DCS software compatibility before installation. A correct module number alone is not sufficient evidence that a replacement will fit an existing I/O configuration without further checks.
Product Introduction — Practical Field Focus
When a transmitter reading is unstable or HART diagnostics cannot be accessed, the cause may be in the field device, loop wiring, grounding, external power arrangement, or I/O configuration—not necessarily the input module itself. The Foxboro FBM214b P0927AH combines eight isolated 4–20 mA input channels with HART communication for compatible field instruments.
Before replacement, confirm the module designation, loop-power method, termination assembly, and cable part number. During commissioning, verify analog readings against a calibrated source or known process reference and check HART communication on representative channels.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Module | FBM214b |
| Part number supplied | P0927AH |
| Later module designation | RH927AH |
| Manufacturer | Foxboro / Schneider Electric |
| Function | HART analog input |
| Number of channels | 8 |
| Input signal | 4–20 mA |
| HART signal | FSK digital signal superimposed on the analog signal |
| Supported HART versions | 5, 6, and 7 |
| Communication method | Point-to-point, master/slave, asynchronous, half-duplex |
| HART baud rate | 1200 baud |
| HART message rate | 2 messages per second |
| Burst mode | Not supported |
| Input accuracy | ±0.03% of full scale |
| Resolution | 15 bits |
| Input update rate | 100 ms |
| Integration time | 500 ms |
| Nominal sense resistor | 61.5 Ω |
| Nominal total input resistance | 280 Ω |
| Internal field-device supply | 24 VDC ±10% per channel |
| Minimum loop compliance voltage | 18.5 VDC at 20.5 mA |
| Module power input | 24 VDC, +5%/-10% |
| Maximum power consumption | 8.4 W |
| Maximum heat dissipation | 5.6 W |
| Module fieldbus | Redundant 2 Mbps |
| Operating temperature | -20°C to +70°C |
| Storage temperature | -40°C to +70°C |
| Relative humidity | 5–95%, noncondensing |
| Operating altitude | -300 to +3,000 m |
| Vibration | 0.75 g from 5 to 500 Hz |
| Module dimensions | 102 × 45 × 104 mm |
| Height including mounting lugs | 114 mm |
| Approximate module weight | 284 g |
| Standard mounting | Modular baseplate; DIN rail or rack-mounted baseplate |
| Standard termination assembly | RH924JH, as listed in the current specification |
| Maximum termination cable length | 30 m |
| Software compatibility | I/A Series v8.2–v8.8 or Control Core Services v9.0 and later, subject to system configuration |
Specifications are based on the standard FBM214b documentation. Compact FBM214b installations can have different termination and loop-resistance details; verify the applicable product specification before using these values for design or procurement.
FBM214b-P0927AH
Related Products
- RH927AH — Later part-number designation for the FBM214b HART input module; verify hardware generation before substitution.
- FBM216b RH927AJ — Redundant-ready HART analog input module for applications requiring an appropriate redundant input arrangement.
- FBM215 RH922VU — HART analog output module for sending control signals to compatible field devices.
- FBM218 RH922VW — Redundant-ready HART analog output module.
- FBM244 RH927AK — Mixed HART I/O module with four analog inputs and four analog outputs.
- FBM211 — Standard 0–20 mA analog input module for applications not requiring the FBM214b’s HART feature set.
- RH924JH — Termination assembly listed for the Compact FBM214b configuration; verify its suitability for the specific module and installation.
- RH903SV (CBM-4) — Four-segment cable balun module for applicable loops sharing a common external power supply.
Frequently Asked Questions
Q1. What does the Foxboro FBM214b do?
It acquires eight 4–20 mA analog input signals and supports HART digital communication with compatible smart field devices. It is used in Foxboro DCS installations for process measurement and supported instrument diagnostics.
Q2. Is the same as RH927AH?
Schneider Electric documentation identifies RH927AH as the FBM214b module designation that supersedes . For a field replacement, still confirm the hardware generation, baseplate, termination assembly, and system configuration.
Q3. Does the FBM214b support HART 7?
Yes. The published specification supports HART versions 5, 6, and 7. It uses 1200-baud, half-duplex communication and supports two digital messages per second. Burst mode is not supported.
Q4. Can the module be replaced while the DCS remains online?
The product specification describes removal and replacement without disconnecting the field termination, power, or communications cables. This does not mean every live replacement is automatically safe. Follow the site’s approved maintenance procedure, assess process consequences, and confirm the system supports the intended replacement method before removing the module.
Q5. What termination assembly does the FBM214b use?
The current standard FBM214b specification lists RH924JH for the Compact FBM214b configuration. Confirm the exact module format and installed termination assembly before ordering, as standard and Compact I/O arrangements must not be assumed interchangeable.
Q6. Why might HART communication fail while the analog reading remains normal?
Possible causes include incompatible device configuration, excessive loop resistance or capacitance, grounding or shielding problems, shared external power wiring without the required balun, and unsupported HART behavior. Check the field wiring and power arrangement before concluding that the module has failed.
Q7. Does the module require calibration after replacement?
The manufacturer’s specification states that calibration of the module or termination assembly is not required. Site acceptance checks are still advisable, including verification of representative input values, channel assignments, loop power, HART communication, and configured alarms.
Q8. What should be checked when purchasing used or refurbished stock?
Request a clear photograph of the complete module label, confirmation of the supplied part number, hardware condition, test scope, warranty terms, and details of included accessories. Confirm whether the item is or RH927AH and whether the intended installation requires standard or Compact hardware. A general statement that a module is “tested” does not establish that all eight channels and HART functions have been verified.
