Description
Product Overview
The Foxboro FBM244 RH927AK is an analog input/output module used in Foxboro I/A Series and Foxboro Evo distributed control systems. It provides four isolated analog input channels and four isolated analog output channels, for eight channels in total. The inputs accept current signals from compatible field transmitters, while the outputs generate current signals for actuators, valve positioners, and other control equipment. Its HART support allows compatible smart field devices to exchange supported digital instrument information alongside their analog current signals.
Each input and output channel is galvanically isolated from the other channels and from ground. This isolation helps limit the effect of electrical differences between field circuits, although it does not replace proper grounding, surge protection, or installation practices. The module supports 0–20.4 mA DC input and output ranges, with typical process applications using 4–20 mA instrumentation. Output channels are rated for loads up to 735 ohms, subject to the specified compliance voltage and wiring conditions. The module communicates with the control system through the redundant 2 Mbps module fieldbus, allowing communication over the active path if the other path fails or is switched at system level.
For plant engineers, the Foxboro FBM244 RH927AK is useful when maintaining mixed analog instrumentation that combines conventional current-loop signals with HART-capable transmitters or actuators. The module supports configurable output fail-safe behavior, including hold or fallback settings, which should be reviewed before commissioning. It can also support certain legacy FBM04 field-wiring arrangements when paired with the appropriate termination assembly or adapter. Replacement planning must account for the installed baseplate, termination assembly, cable part number, field-loop power arrangement, and controller compatibility. A module with the correct part number is only one part of a successful replacement; the application configuration and each channel’s signal direction must also match the existing design.
Product Introduction — Practical Maintenance Focus
When a process loop stops responding, the fault may lie in the transmitter, wiring, termination assembly, output load, or control module. The Foxboro FBM244 RH927AK combines four isolated current inputs and four isolated current outputs in one HART-capable module, making it suitable for mixed measurement and control duties in compatible Foxboro DCS installations.
Before replacing the module, check whether each channel is configured as an input or output, confirm the termination assembly and cable, and verify the required fail-safe behavior. This reduces the risk of restoring the hardware while leaving a field loop incorrectly configured.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Model | FBM244 |
| Part number | RH927AK |
| Older part designation | P0927AK |
| Manufacturer | Foxboro / Schneider Electric |
| Module family | Standard 200 Series FBM |
| Product type | Analog input/output module with HART support |
| Analog inputs | 4 isolated channels |
| Analog outputs | 4 isolated channels |
| Total channels | 8 |
| Input range | 0–20.4 mA DC |
| Output range | 0–20.4 mA DC |
| Input accuracy | ±0.03% of span |
| Output accuracy | ±0.05% of span at 25°C over 4–20 mA |
| Maximum output load | 735 Ω |
| Nominal output compliance voltage | 18.6 V at 20 mA at field terminals |
| Output resolution | 12 bits |
| Output settling time | 100 ms to settle within a 1% band for the specified step test |
| HART support | Versions 5, 6, and 7 |
| Channel isolation | Galvanically isolated from other channels and ground |
| Fieldbus | Redundant 2 Mbps module fieldbus |
| Compatible termination assemblies | RH924QU, RH924QZ, subject to application requirements |
| Operating temperature | −20°C to +70°C |
| Storage temperature | −40°C to +70°C |
| Relative humidity | 5–95%, non-condensing |
| Module dimensions | 102 mm high; 114 mm including mounting lugs × 45 mm wide × 104 mm deep |
| Module weight | Approximately 284 g |
| Mounting | Modular baseplate or compatible conversion mounting structure |
FBM244 RH927AK
Related Products
- FBM04: A legacy 100 Series analog I/O module. The FBM244 can support certain FBM04 field-wiring arrangements with the appropriate termination hardware or adapter.
- RH924QU: Compatible termination assembly option for FBM244 field wiring.
- RH924QZ: Another termination assembly option listed for applications; confirm the required field-circuit configuration.
- RH916DA: 0.5 m termination cable option for the specified Type 1 assembly.
- RH916DC: 3 m termination cable option for the specified Type 1 assembly.
- RH928AA: 0.5 m low-smoke, zero-halogen termination cable option.
- RH928AD: 3 m low-smoke, zero-halogen termination cable option.
- FCP280: Foxboro control processor used in compatible Foxboro DCS architectures.
- FBM216: HART input module for applications requiring a different input-only channel arrangement.
- FBM215: HART output module for applications requiring a different output-focused arrangement.
Related parts serve different functions or support the installation. Verify the exact hardware and wiring requirements before selecting any alternative.
Frequently Asked Questions
Q1. What is the Foxboro RH927AK used for?
It interfaces analog field transmitters and actuators with a compatible Foxboro DCS. Four channels accept current inputs, while four channels provide current outputs, allowing one module to support both measurement and control duties.
Q2. Is the a four-input or eight-channel module?
It has four analog inputs and four analog outputs, for eight channels total. It is not a four-input-only card, and its channel direction must be reflected in the wiring and application configuration.
Q3. Does the support HART communication?
Yes. The module supports HART versions 5, 6, and 7 for compatible field instruments. HART functionality depends on the instrument, channel configuration, termination arrangement, and the relevant Foxboro DCS software.
Q4. Can I hot-swap the ?
The manufacturer states that the module can be removed or replaced without removing field-device termination cabling, power, or communications cabling. However, whether replacement is permitted while the process is running depends on the installed system, maintenance procedure, and process risk. Follow the approved site procedure and confirm the effect on the affected loops before removal.
Q5. Can the RH927AK replace a P0927AK?
The current Schneider Electric specification lists as the part number, and earlier documentation identifies as superseding P0927AK. Still, confirm the complete module designation, baseplate, termination assembly, and system revision before ordering or installing a replacement.
Q6. Which termination assembly should be used with the ?
The current product specification lists RH924QU and RH924QZ as compatible termination assembly options. The correct choice depends on the field wiring and required certification. Confirm the assembly type and termination cable length against the installed system documentation.
Q7. What should be checked before commissioning a replacement module?
Verify the input/output assignment for each channel, current-loop polarity, loop power, HART requirements, output load, and fail-safe fallback settings. Check the fieldbus status and confirm that each transmitter reading and output command behaves correctly before returning the affected process loops to service.
Q8. What should procurement verify for refurbished stock?
Ask for clear photographs of the label, confirmation of the module’s condition, a functional test report, and written warranty terms. Check connector condition and compatibility with the existing termination assembly. A seller’s claim that a module is “tested” should be supported by evidence of channel and communication checks.
