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Brand: Pepperl+Fuchs
Pepperl+Fuchs HD2-DM-A Advanced Diagnostic Module, 4 Segments
Description
HD2-DM-A advanced diagnostic module for FieldConnex Power Hub
The HD2-DM-A is a plug-in Advanced Diagnostic Module (ADM) for the Pepperl+Fuchs FieldConnex Power Hub. It measures the physical layer of up to four FOUNDATION Fieldbus H1 or PROFIBUS PA segments through passive circuits and reports gradual or sudden degradations before they stop communication.
Reading the code: HD2 is the Power Hub plug-in range, DM is the diagnostic module and A is the advanced version. The manufacturer also lists HD2-DM-B and HD2-DM-A.RO modules; check their own datasheets before treating them as equivalent.
Seven Star LLC supplies this module in Oman and the GCC as an independent supplier in Muscat.
Technical specifications of the HD2-DM-A
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Pepperl+Fuchs HD2-DM-A |
| Segments monitored | 4, FOUNDATION Fieldbus or PROFIBUS PA; fieldbus voltage 9 to 32 V |
| Supply | 19.2 to 35 V, 30 to 110 mA; power dissipation max. 2 W |
| Diagnostic interface | RS 485 diagnostic bus; diagnostic address 1 to 247 set binary by DIP switch |
| Indicators | PRI PWR and SEC PWR green; segment LEDs yellow for bus activity, red flashing at 2 Hz for alarm, steady red for hardware error |
| Fault signal | VFC alarm contact 1 A, 50 V DC, normally closed |
| Isolation | Segment to segment and segment to supply: functional insulation to IEC 62103, 50 V rms |
| Installation | Motherboard based, Zone 2 / Class I, Div. 2 |
| Ambient temperature | -40 to 70 °C; storage -40 to 85 °C; humidity below 95 % non-condensing |
| Mechanical | Shock 15 g 11 ms, vibration 1 g 10 to 150 Hz, corrosion class ISA-S71.04 G3; polycarbonate, IP20, approx. 100 g |
How the HD2-DM-A watches the fieldbus
The module uses passive input circuits, so the measuring inputs do not load or distort the segment. It detects gradual or sudden changes of the physical layer, which makes it possible to spot slow drift caused by corrosion, water in junction boxes or damaged cable, and also intermittent faults that a simple alarm would miss.
Results go to a diagnostic bus (RS 485) and from there to the Diagnostic Manager software or to the DCS and asset management system, so the status of the physical layer can be seen from the control room.
System fit and related parts
The HD2-DM-A plugs into the Power Hub motherboard alongside power supply modules such as HD2-FBPS-1.25.360 and gateway modules. Each hub can use one ADM for up to four segments. For single-segment installations with the K-System housing, a mobile Advanced Diagnostic Module is used with the KLD2-FBPS-1.25.360 test sockets.
Selection and ordering checklist for the HD2-DM-A
- Number of segments to be monitored (up to 4 per module).
- Fieldbus type: FOUNDATION Fieldbus H1 or PROFIBUS PA.
- Diagnostic bus address from 1 to 247 and DCS integration plan.
- Alarm contact wiring (normally closed).
- Diagnostic Manager software licence level, which is separate from the hardware.
Installation, commissioning and maintenance of the HD2-DM-A
Plug the module into its slot in the Power Hub motherboard, set the DIP switch address and connect the diagnostic bus. Run the automatic setup in the configuration tool, and record the baseline values of each segment at commissioning; later deviations are then easier to interpret.
Fieldbus diagnostics are most valuable when baselines are stored. Review alarms on the control room display, and replace the module without tools when the hub is designed for hot swap, following the Power Hub documentation.
Archive the DIP switch address list of every hub, since two diagnostic modules with the same address on one RS 485 line will disturb each other. After a replacement, check that the new module reports all four segments and that the alarm contact is closed in the healthy state.
Reading diagnostic results from the HD2-DM-A
A fieldbus segment can still communicate while margin is shrinking. The HD2-DM-A presents the margin so maintenance can act before communication errors start. Typical causes found with such tools are wet or corroded terminals, missing terminators and cable screen problems.
Combine the module data with a record of device additions, because a new device or cable change shifts the baseline.
Typical applications in Oman and the GCC
In Oman and the GCC the HD2-DM-A is useful on large FOUNDATION Fieldbus or PROFIBUS PA installations in oil, gas and power plants, where hot and humid conditions, salt air and long cable runs put the physical layer at risk. Many plants only look at the fieldbus when a device drops out; a diagnostic module turns that into continuous condition monitoring and shortens fault finding during outages, when every hour of shutdown is expensive.
Plan the diagnostic bus together with the control system team: the address range, cabling of the RS 485 line, the alarm contact wiring and the software licence are separate items, and all must be in place before the module delivers value. Include the module in the commissioning checklist and archive the baseline readings for future comparison.
Family comparison
| Part | Key difference |
|---|---|
| HD2-DM-A (this part) | Advanced diagnostics, 4 segments |
| HD2-DM-A.RO | Related module, see its own datasheet |
| HD2-DM-B | Related module, see its own datasheet |
| HD2-FBPS-1.25.360 | Power supply module for the same hub |
Information to send with an RFQ
- Part number HD2-DM-A and quantity
- Fieldbus type and segment count
- Existing Power Hub or motherboard
- DCS integration requirement
- Delivery location
Documents and quotation
The manufacturer datasheet for HD2-DM-A is attached on this page, so you can check wiring, approvals and dimensions before ordering. Send the exact part number, quantity and delivery location in Oman or the GCC and Seven Star LLC will reply with a quotation.
Seven Star LLC is an independent supplier in Muscat and is not the manufacturer; confirm availability, lead time and any project approval requirements in your RFQ.
Other Models in the Pf Fc Hd2 Range
Seven Star LLC supplies models from the Pf Fc Hd2 range in Oman and the GCC. Compare the related models below and request a quote for the one that matches your application.
| Model | Category | |
|---|---|---|
| Pepperl+Fuchs HD2-DM-A Advanced Diagnostic Module, 4 Segments | Controllers & Data Acquisition | You are viewing this model |
| Pepperl+Fuchs HD2-FBPS-1.25.360 Fieldbus Power Supply Module | Power Modules | View details |
Datasheets & Documents
- Datasheet Pepperl+Fuchs HD2-DM-A Datasheet Download
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About brand
Pepperl+Fuchs is a German manufacturer of industrial sensors and explosion protection equipment, founded in 1945 in Mannheim by Walter Pepperl and Ludwig Fuchs as a radio repair shop. Defective transformers led them into manufacturing, and the company developed its first proximity switch in the late 1950s. Pepperl+Fuchs is headquartered in Mannheim and is a pioneer of intrinsically safe electrical equipment for hazardous areas.
Seven Star LLC lists Pepperl+Fuchs sensors, isolated barriers, power supplies and hazardous-area mobile devices, and supplies them to instrument and automation teams in Oman by exact model designation.
Pepperl+Fuchs company profile
| Founded | 1945, Mannheim-Sandhofen, Germany, by Walter Pepperl and Ludwig Fuchs |
|---|---|
| Headquarters | Mannheim, Germany |
| Ownership | Privately owned (Pepperl+Fuchs SE) |
| Origins | Radio repair workshop that began making replacement transformers |
| Product families | Inductive, capacitive, ultrasonic and photoelectric sensors, rotary encoders, R2000 LiDAR scanners, KFD and HiC isolated barriers, Zener barriers, remote I/O, purge and pressurization systems, Ex-rated enclosures |
Milestones
- 1945: Walter Pepperl and Ludwig Fuchs open their radio repair shop in Mannheim.
- 1958: The first proximity switch is developed (some company sources say 1959).
Pepperl+Fuchs product families on this page
On the interface side there are two systems. The K-System mounts on DIN rail and is represented here by the KFD2-UT2-Ex2 universal temperature converter. The H-System plugs into termination boards and is represented by the HiD2030 SMART transmitter power supply with HART. The PS1000-A6-24.20 is a 24 VDC, 20 A power supply for cabinets. Sensors listed include the NJ2-12GK-SN NAMUR inductive sensor, the R101 retro-reflective photoelectric sensor and the R2000 2-D LiDAR scanner. For field staff there are the Tab-Ex 05 DZ1 tablet for Zone 1/21 areas and the Smart-Ex 03 DZ2 smartphone for Zone 2/22 and Division 2 areas.
Where Pepperl+Fuchs equipment is used
Isolated barriers sit between field instruments in Zone 0 or Zone 1 and the DCS or safety system in refineries, gas plants and chemical works. NAMUR sensors report valve position and machine states in classified areas. Photoelectric sensors and LiDAR scanners work in conveying, packaging, warehousing and vehicle guidance. Ex-rated tablets and phones are carried on operator rounds and maintenance jobs.
Pepperl+Fuchs products we list
Ordering Pepperl+Fuchs parts: what we need
Send the complete model designation as printed on the device, including every suffix; a single letter can change the supply voltage or the output type. Add the part number if the label shows one. For barriers, tell us the field device and signal type, the number of channels and whether the safety loop needs a SIL-assessed module. For mobile devices, state the zone or division and the regional radio version.
Facts checked against Pepperl+Fuchs's own chronicle pages, October 2026.
Browse Pepperl+Fuchs products by category: Sensors & Transmitters, Industrial Computer, Isolator & Barrier, Power Modules.
FAQ
Questions about the Pepperl+Fuchs HD2-DM-A Advanced Diagnostic Module,
Answers from our engineering team on installation, compatibility and integration.
01What does the HD2-DM-A measure?
The physical layer of up to four FOUNDATION Fieldbus H1 or PROFIBUS PA segments through passive inputs.
02How does it report faults?
By LEDs per segment, a normally closed alarm contact rated 1 A / 50 V DC and an RS 485 diagnostic bus.
03What supply is required?
19.2 to 35 V, with 30 to 110 mA current and up to 2 W dissipation.
04How is the diagnostic address set?
By a binary coded DIP switch from 1 to 247.
05What temperature range does it cover?
-40 to 70 °C ambient, installed in Zone 2 / Div. 2 on a Power Hub motherboard.
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