FBM24 DM900HT
Foxboro FBM24 DM900HT Contact/125 V dc Input Interface Module
FBM24 DM900HT identifies the requested Foxboro I/A Series input module. The manufacturer specification reviewed for this page identifies FBM24 as an expandable main Contact/125 V dc Input Interface Module. Technical details below are limited to that official FBM24 specification.
Confirmed Product Information
| Manufacturer | The Foxboro Company / Foxboro I/A Series |
| Requested identifier | FBM24 DM900HT |
| Official FBM type | Contact/125 V dc Input Interface Module; expandable main module |
| Input capacity | 16 independent channels, or 15 contact-sensor channels when an external supply is used |
| Fieldbus role | Converts field digital input signals and communicates through the redundant Fieldbus |
| Expansion capability | Supports one compatible expansion module as the expandable main module |
Functional Role And Applications
The official Foxboro specification describes FBM24 as a fieldbus interface for contact-sensor or dc-voltage-monitor inputs. Each module performs the signal conversion required to pass digital field input states to the redundant Fieldbus.
- 15- or 16-channel contact-sensor monitoring, depending on the supply arrangement.
- 16-channel dc voltage monitoring.
- Digital I/O, Sequence of Events Monitor, Pulse Count Inputs or Ladder Logic application programs when used alone or with an input-only expansion module.
- Digital I/O or Ladder Logic programs when paired with an expansion module that handles both inputs and outputs.
Electrical And Input Specifications
| Module input power | 26 to 42 V dc redundant input |
| Power consumption | 8 W maximum for the main module |
| Heat dissipation | 15 W maximum for the main module |
| Input filter time | Configurable: 4, 8, 16 or 32 ms |
| Contact sensor open-circuit voltage | 48 V dc nominal |
| Contact sensor short-circuit current | 2.5 mA ±20% |
| External contact supply | 48 to 150 V dc |
| Voltage monitor ON / OFF | ON: 33 to 150 V dc; OFF: 0 to 10 V dc |
| Isolation withstand | 1250 V ac for one minute between any channel and earth, under the conditions stated in the manufacturer specification |
Termination, Indicators And Mounting
- Two operational-status LEDs: one red and one green.
- Sixteen input-channel status LEDs, one per channel.
- Termination options include two 16-terminal discrete wire blocks, a 34-pin plug connector block or a 32-terminal direct connection block, subject to enclosure and cable-assembly design.
- With a Y-adapter: suitable for the 1x8 Mounting Structure, I/A Series Industrial Enclosures and Field Enclosure 8.
- Without a Y-adapter: suitable for Field Enclosure 4 and the 1x8 FBM Mounting Structure.
Physical data
FBM24 DM900HT official FBM mass: 1 kg (2.2 lb).
Select the termination assembly and enclosure from the installed I/A Series design rather than by connector appearance alone.
Environmental Specifications
| Operating temperature | 0 to 60°C (32 to 140°F) |
| Storage temperature | -40 to +70°C (-40 to +158°F) |
| Relative humidity | 5 to 95%, noncondensing |
| Operating altitude | -300 to +3,000 m (-1,000 to +10,000 ft) |
| Contamination class | ISA S71.04 Class G3 (Harsh) |
Compatibility And Replacement Guidance
For a FBM24 DM900HT replacement, confirm the full nameplate, FBM variant, input configuration, Fieldbus connection, termination assembly, Y-adapter use, enclosure, channel wiring and configured application program. The FBM24 main module may support one compatible expansion module, but an expansion module is functionally dependent on its supporting main module.
The manufacturer document reviewed for this page covers FBM24 together with the FBM25 expansion input interface module; it does not state that FBM25 is a direct replacement for FBM24. No official direct successor or conversion procedure for DM900HT was confirmed in the reviewed manufacturer material.
Lifecycle Status
The reviewed Foxboro product specification does not provide a discontinuation date for FBM24 DM900HT and does not identify a complete drop-in replacement. Confirm current lifecycle, revision and supported system configuration with the manufacturer for the installed site.
Frequently Asked Questions
Which Input Configuration Must Be Confirmed For Foxboro FBM24 DM900HT?
Confirm whether the installed module is configured for contact sensors, contact sensors with an external supply or dc voltage monitoring. The channel count and field wiring depend on that configuration.
Can Foxboro FBM24 DM900HT Be Ordered By Connector Appearance Alone?
No. Verify the discrete-wire, 34-pin plug-connector or direct-connection termination design, plus the enclosure and termination cable assembly used at the site.
Does Foxboro FBM24 DM900HT Support An Expansion Module?
The official FBM24 specification describes it as an expandable main module capable of supporting one expansion module. Confirm the expansion-module type and configured application program before installation.
What Site Conditions Should Be Checked Before Installing Foxboro FBM24 DM900HT?
Check enclosure type, mounting structure, Y-adapter requirement, ambient temperature, humidity, altitude, contamination class, Fieldbus connection and field wiring against the site design.
Is A Direct Successor Confirmed For Foxboro FBM24 DM900HT?
No direct successor or drop-in conversion was identified in the reviewed manufacturer specification. Confirm lifecycle and migration requirements for the installed I/A Series configuration before ordering.
Model Identification
Use the complete requested identifier FBM24 DM900HT. Customer records may also be searched under DM900HT or FBM24, but the complete nameplate, revision and installed wiring must be verified before supply.
Manufacturer Reference
Foxboro Product Specification PSS 21H-2E4 B4, I/A Series Hardware, Contact/125 V dc Input Interface Module (FBM24) and Contact/125 V dc Expansion Input Interface Module (FBM25), 1998 edition. Product data on this page is limited to the manufacturer document reviewed; external website links are intentionally omitted.
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PLC Leader is an independent industrial automation parts supplier based in China. We support maintenance teams, system integrators, distributors and industrial end users sourcing current, surplus, legacy and hard-to-find PLC, DCS, drive, safety and machinery-monitoring components.
Availability, product condition and order requirements are confirmed for each RFQ.
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