Description
Product Introduction
The DS3800NHVJ1A1A is an enhanced version of the high-voltage junction interface board—the NHVJ with improved diagnostics. The suffix tells the story: the first “1” indicates a hardware revision with improved isolation and signal conditioning. The “A” specifies the standard configuration. The second “1” adds enhanced diagnostic features (configuration verification, junction point monitoring). The final “A” is the standard environmental package (no conformal coating). This board was designed for installations where better diagnostic feedback was needed for high-voltage junction applications.
The enhanced diagnostics verify the board’s configuration and provide detailed status reporting on the junction points. Compare this to the base DS3800NHVJ (standard diagnostics). The 1A1A gives you the same basic functionality with better diagnostic feedback.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Interface Type | High-voltage junction interface with enhanced diagnostics |
| Voltage Rating | High-voltage (specific ratings depend on configuration) |
| Isolation | Electrical isolation for backplane protection |
| Junction Points | Configurable (depending on configuration) |
| Diagnostic Features | Configuration verification, junction point monitoring, error logging |
| Diagnostic LEDs | Power, Link Status, Junction Status, Config OK, Fault |
| Backplane Interface | Parallel, Mark IV-specific |
| CPU Compatibility | DS3800DMP series (Mark IV) — firmware v3.0 or later recommended |
| Backplane Current Draw | +5V DC @ 0.8A, +12V DC @ 0.3A |
| Operating Temperature | 0 to 60°C (non-condensing) |
| Dimensions | 328 mm x 185 mm x 20 mm (full-length Mark IV) |
| Mounting | Standard Mark IV rack slot |
| Configuration | No DIP switches—hardware address fixed |
Compatible Replacement Models
| Model | Compatibility Level | Notes |
|---|---|---|
| DS3800NHVJ | ⚠️ Software Compatible | Base model without enhanced diagnostics. Hardware fits, but you lose junction point monitoring. |
| DS3800NHVJ1 | ⚠️ Software Compatible | Hardware revision without enhanced diagnostics. |
| DS3800NHVJ1A | ⚠️ Software Compatible | Enhanced configuration without diagnostic features. |
| DS3800NHVJ1A1 | ✅ Drop-in Replacement | Same board without the “A” coating. Functionally identical. |
| DS3800NHVD1A1A | ✅ Drop-in Replacement | Similar high-voltage digital interface—check configuration. |
Frequently Asked Questions (FAQ)
What’s the difference between the NHVJ1A1A and the base NHVJ?
The 1A1A adds enhanced diagnostics—configuration verification, junction point monitoring, and error logging. The base NHVJ has basic link status only. The junction point monitoring gives you visibility into the health of each termination point.
What’s the “Junction Status” LED?
The Junction Status LED indicates the integrity of the junction points. The board monitors each junction point for leakage or breakdown. Green means all junctions are healthy. Red means one or more junctions are degraded—check the field wiring.
Do I need to upgrade my DMP firmware for the enhanced diagnostics?
The enhanced diagnostics require DMP firmware v3.0 or later. Older firmware won’t recognize the diagnostic registers. We can provide the firmware EPROMs if you need them.
What’s the voltage rating of this board?
The voltage rating depends on the specific configuration. Check the board’s label or your system documentation for the exact voltage rating.
Can I hot-swap this board?
No. Mark IV backplanes are not hot-swappable. Power down the cabinet, lock out the breaker, and wait 60 seconds before removing or installing the board.
What’s your warranty and lead time?
We stock the NHVJ1A1A in limited quantities. Lead time is 1-2 business days. We offer a 1-year warranty. We test every board with a 24-hour burn-in and a diagnostic verification. The test report is included.
Is this board compatible with the Mark VIe?
No. This board is for Mark IV systems only. The backplane architecture is different.

ABB 5SHY3545L0010
SCHNEIDER 140CPU65260
SIEMENS VF10-5
Email: sales@plcfcs.com
Phone:+86 15343416922
Wechat:+86 15343416922
PLC : Allen Bradley , Siemens MOORE, GE FANUC , Schneider
DCS : ABB ,Honeywell, Invensys Triconex , Foxboro , Ovation,YOKOGAWA, Woodword, HIMA
TSI : Triconex , HIMA , Bently Nevada , ICS Triplex
Complete service we offer
Payment: T/T
Delivery: 1-2 days
Shipment: DHL UPS FedEx, etc
After-sales service: Yes, 24/7 hours




Email: jiedong@sxrszdh.com
Phone / Wechat:+86 15340683922

Wechat:+86 15343416922