Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | MTL Instruments / Eaton MTL |
| Model | F802 |
| Product Family | F800 |
| Product Type | 8-segment Fieldbus Power Module |
| Fieldbus | FOUNDATION Fieldbus H1 |
| Number of Channels | 8 |
| Input Voltage | 19.2–30.0 VDC |
| Nominal Segment Output | 28.0 VDC |
| Output Range | 28.0–30.0 VDC |
| Design Current | 0–500 mA per segment |
| Current Limit | >520 mA |
| Minimum Load | 0 mA |
| Fieldbus/Input Isolation | 250 VAC RMS withstand |
| Segment/Segment Isolation | 200 VDC withstand |
| Alarm Contact | Normally closed, 1 A max at 30 VDC |
| Operating Temperature | -40°C to +50°C at full load; -40°C to +65°C at 60% load |
| Storage Temperature | -40°C to +85°C |
| Protection | IP20 |
| Mounting | 35 mm DIN rail via F800 carrier |
| Approx. Module Weight | 1.5 kg |
The F802’s higher 28 V / 500 mA segment output distinguishes it from the F801, which is specified at 21.5–24 V and 350 mA. MTL positions the F802 for heavily loaded fieldbus networks and longer trunk applications.
Product Introduction
The MTL F802 is a high-density FOUNDATION Fieldbus H1 power module designed for the MTL F800 fieldbus power architecture. It provides eight individually powered fieldbus segments, with 28 V nominal output and 500 mA design current per segment. The module also provides the electrical isolation and monitoring functions required by the F800 system.
This is a fieldbus infrastructure component rather than a conventional PLC/DCS I/O module. In an installed system, the F802 works with an F800 carrier and associated fieldbus wiring; it can be deployed singly or as a redundant pair. FieldComm Group documentation specifically identifies the F802-based F8xx system as an eight-segment FOUNDATION Fieldbus H1 power supply/conditioner with load-sharing redundant operation.
MTL F802
Engineering Pain Point
The common mistake with an replacement is treating the module as a generic 24 VDC source. Its output characteristics directly affect fieldbus segment operation, and the F800 carrier provides the external segment connections and system-level termination. Replacing an with an F801 changes the segment voltage/current characteristics and should not be treated as a drop-in substitution without checking the installed fieldbus design.
Typical Applications
- FOUNDATION Fieldbus H1 segment power in DCS and process-control systems.
- High-load fieldbus segments requiring up to 500 mA design current.
- Longer fieldbus trunk installations where the ‘s higher output voltage is appropriate.
- Redundant fieldbus power architectures using two modules for load sharing and power availability.
Technical Pitfalls to Avoid
- Do not confuse with F801. F801 is the 21.5–24 V / 350 mA version; is the 28–30 V / 500 mA version. The difference is electrically significant.
- Check the carrier. is installed in the appropriate -series carrier. The carrier provides the field wiring and module interconnections; the itself is not a standalone eight-channel terminal assembly.
- Verify redundant versus simplex operation. Two modules can operate redundantly with load sharing. A single can also be used in simplex configurations. The installed carrier and alarm arrangement must match the intended architecture.
- Check fieldbus loading before substitution. Each segment is designed for up to 500 mA, but actual allowable loading depends on the fieldbus devices, cable length, barriers, and installed fieldbus topology.
- Do not overlook temperature derating. At full load, the published operating range is -40°C to +50°C; the +65°C limit applies at 60% load.
- Confirm hazardous-area requirements at system level. documentation includes Class I Division 2 / Zone 2 and Ex nA certifications for specified configurations, but certification applicability depends on the complete installation and revision.
Related Products
- MTL F801 — 8-segment fieldbus power module with 21.5–24 V output and 350 mA design current; not electrically equivalent to .
- MTL F809F — Fieldbus diagnostic module used with the architecture.
- MTL F811 — Eight-segment FOUNDATION Fieldbus power system using F801 or modules.
- MTL F890 — Redundant fieldbus power supply system designed around / power modules.
- MTL -BLK — Blanking module used where a power-module position is intentionally left unused.
- MTL F882 — Related fieldbus power-system hardware documented with / modules.
For procurement, specify and verify the existing carrier, number of installed modules, fieldbus segment loading, terminal style, revision, and hazardous-area requirements. The critical point is matching the complete fieldbus power architecture, not simply matching the module’s physical dimensions.
