Description
Foxboro FBM239 RH927AG Product Page
Product Overview
The Foxboro FBM239 RH927AG is a 200 Series discrete I/O module designed for Foxboro I/A Series and compatible Foxboro DCS installations. It combines 16 digital input channels and 16 digital output channels in a single module, giving the control system a total of 32 discrete signal channels. The inputs monitor field states such as limit switches, relay contacts, and equipment status signals. The outputs control compatible discrete field loads, including relays and other devices used in process interlocks and equipment sequencing.
The module uses group-isolated input and output circuits, and its exact electrical behavior depends on the selected field termination assembly. With the appropriate feed-through termination assembly, input channels can be configured for voltage monitoring or contact sensing. The documented voltage-monitor arrangement recognizes an ON state from 15 to 30 VDC and an OFF state from 0 to 5 VDC, subject to the specified source-resistance limits. Output circuits use an external DC supply, with a maximum applied voltage of 60 VDC and a maximum load current of 0.24 A per channel. The termination assembly also has an aggregate current limit, so individual channel ratings should not be treated as permission to load every output to its maximum simultaneously. Input filtering can be configured to suppress brief transitions and contact bounce.
For maintenance engineers, the Foxboro FBM239 RH927AG is relevant when a legacy control system requires both field-state monitoring and discrete command outputs. It communicates with its associated Foxboro fieldbus communication module or controller over the module fieldbus. Before replacing it, check the installed termination assembly, channel assignment, external output supply, field wiring, and debounce settings. The part number identifies the module itself; it does not by itself identify every termination component needed for the installation. Where inductive loads are connected, the output circuit may require a suitable protective diode or metal-oxide varistor. Verify the actual load and approved wiring design before commissioning.
Product Introduction — Field Maintenance Focus
When discrete inputs appear unstable or output-driven relays fail to operate, the fault may involve field wiring, the termination assembly, external supply, load current, or the I/O module itself. The FBM239 RH927AG combines 16 digital inputs and 16 digital outputs for compatible Foxboro DCS applications, making it useful for monitoring and control in the same field interface.
For a replacement, match the existing termination assembly and check both the per-channel output rating and the assembly’s total-current limit. Restore the documented input filtering and confirm each input and output point during commissioning.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Model | FBM239 |
| Part number | RH927AG |
| Previous part number | P0927AG |
| Manufacturer | Foxboro / Schneider Electric |
| Product type | Discrete digital I/O module |
| Digital inputs | 16 |
| Digital outputs | 16 |
| Total channels | 32 |
| Isolation | Group isolated from other channel groups and ground |
| Voltage-monitor input | 30 VDC maximum applied voltage |
| Input ON-state | 15–30 VDC |
| Input OFF-state | 0–5 VDC |
| Maximum ON-state input current | 2.3 mA at 30 VDC |
| Contact-sense supply | 24 VDC nominal, supplied through the appropriate termination assembly |
| Contact-sense current | 1.8 mA DC nominal |
| External output voltage | 60 VDC maximum |
| Output load current | 0.24 A maximum per channel |
| Termination-assembly output current | Up to 2.0 A maximum per TA for the specified arrangements |
| Input filter/debounce | No filtering, 4, 8, 16, or 32 ms |
| Module supply | 24 VDC, +5% / −10% |
| Operating temperature | −20°C to +70°C |
| Storage temperature | −40°C to +70°C |
| Relative humidity | 5–95%, non-condensing |
| Mounting | Compatible baseplate; DIN rail or 19-inch rack with appropriate hardware |
| Module dimensions | Approximately 102 × 45 × 104 mm, excluding mounting-lug allowance |
| Module weight | Approximately 284 g |
| Termination cable length | Up to 30 m, depending on cable type and installation |
Specification note: Voltage-monitor and contact-sense figures depend on the selected termination assembly. Verify the exact TA model and its wiring diagram before applying field power.
FBM239 RH927AG
Related Products
- FBM238 RH927AF: A related 32-channel discrete I/O module with a different input/output channel arrangement. Do not substitute it without checking the point map.
- FBM242 RH916TA: A digital output module for applications requiring a different output-focused channel configuration.
- FBM241b RH914WK: A digital input/output module variant with voltage-monitor inputs and internal-source outputs.
- FBM241c RH914WM: A related variant using contact-sense inputs and external-source outputs.
- FBM207 RH914TD: A 16-channel digital input voltage-monitor module.
- FBM216b RH927AJ: A redundant-ready HART input module; it serves an analog instrument role rather than discrete I/O.
- RH924VJ: Feed-through termination assembly option used with compatible FBM239 arrangements.
- RH924VM: Feed-through termination assembly option for compatible contact-sense and output wiring arrangements.
- Foxboro FCP280: A compatible control processor in supported Foxboro DCS architectures; it is a controller, not an I/O replacement.
Related products differ in signal type, channel assignment, or termination requirements. Confirm compatibility in the installed system documentation before choosing an alternative.
Frequently Asked Questions
Q1. What is the Foxboro RH927AG used for?
It provides 16 discrete inputs and 16 discrete outputs for compatible Foxboro DCS installations. The inputs monitor field states, while the outputs command compatible discrete devices.
Q2. Is the a 32-channel digital input module?
No. Its 32 channels are divided into 16 digital inputs and 16 digital outputs. If the application needs 32 inputs, this module does not provide that configuration.
Q3. Can the directly drive solenoids or relays?
It can drive compatible loads within the documented output limits. The external supply must not exceed 60 VDC, and each channel is limited to 0.24 A. The applicable termination assembly also imposes an aggregate current limit. Inductive loads may require a protective diode or MOV.
Q4. Can I hot-swap the ?
Do not assume online replacement is safe in every installation. The permissibility and process impact depend on the installed Foxboro architecture, redundancy, field-output behavior, and maintenance procedure. Follow the site’s approved module-replacement procedure and establish the safe state of affected equipment before removal.
Q5. Does supersede P0927AG?
The Foxboro product specification identifies as the module part number superseding P0927AG. For an actual replacement, verify the complete label and the compatibility of the termination assembly and installed system revision.
Q6. What termination assembly does the require?
The correct assembly depends on whether the application uses voltage-monitor inputs, contact-sense inputs, and the intended output wiring arrangement. RH924VJ and RH924VM are documented feed-through options for compatible configurations. Confirm the complete termination assembly and cable details against the existing wiring records.
Q7. What should be checked if an input signal is unstable?
Inspect the field contact, source resistance, signal voltage, wiring, and termination assembly first. Then check the configured debounce interval. Filtering can reduce short transitions, but excessive filtering may delay detection of a legitimate field change.
Q8. What should procurement verify for a refurbished ?
Confirm the label, physical condition, connector integrity, functional-test evidence, warranty, and return terms. Ask whether testing covered both input and output channels. Also verify that the installed termination assembly and output-load requirements match the proposed replacement.
