Product Core Brief
- Model: KJ4001X1-NA1 (12P3373X012)
- Brand: Emerson
- Series: DeltaV S‑series / MD Plus
- Core Function: Extends LocalBus communication for remote I/O rack deployment
- Product Type: Horizontal LocalBus Dual Right Cable Extender
- Key Specs: 12.6 VDC / 8A | Dual right‑side ports | 6.5m max bus length
- Note: New original, factory sealed, 12‑month warranty
Key Technical Specifications
- Part Number: (alias 12P3373X012)
- Form Factor: 1‑wide horizontal DeltaV slot
- Bus Interface: Dual LocalBus, right‑side only
- Power: 12.6 VDC, 8A, LocalBus‑powered (no external supply)
- Max Bus Length: 6.5 meters total (carriers + extenders)
- Operating Temp: –40°C to +70°C
- Humidity: 5%–95% non‑condensing
- Shock/Vibration: 10g peak / 1mm pp (5–16 Hz)
- Ingress Protection: IP20
- Certifications: ATEX II 3G, Class I Div.2, CE, UL/cUL
- Dimensions: 140 × 80 × 25 mm
- Weight: 0.18 kg
Product Introduction
The Emerson is a dedicated LocalBus extender for DeltaV DCS, providing dual right‑side ports to stretch communication between controllers and remote I/O racks. It installs horizontally in a standard DeltaV slot and draws power directly from the LocalBus backplane.
This unit lets engineers split I/O hardware across multiple cabinets without signal loss. Its fixed right‑side orientation and 6.5m total length limit simplify layout planning while maintaining noise immunity in Class G3 industrial environments.
QA & Testing SOP (Transparency Building)
- Incoming Inspection: Verify OEM part number, Rev C labeling, and hologram; check PCB for burn marks or cold solder joints; cross‑serial with Emerson database to flag counterfeits.
- Live Testing: Mount in DeltaV S‑series chassis; apply 12.6 VDC; confirm LocalBus handshake with Fluke 115; run 24‑hour load test at 8A to rule out thermal faults.
- Electrical Testing: Measure insulation resistance >10MΩ between chassis and signal pins; verify ground continuity <0.5Ω; check for voltage ripple <50mV.
- Firmware/Config Backup: Record exact firmware revision; photograph DIP switch positions; save bus configuration file to secure server.
- Final QC & Packaging: Label with test date and tech initials; seal in ESD bag; include foam padding and QC checklist; box with OEM labeling.
Installation Pitfalls & Guide (Engineer to Engineer)
❗ No Hot‑Swap Capability: The module connects directly to the LocalBus backplane; power‑on removal can short the 12.6 VDC rail and damage the controller (field cost: 8,000–12,000). Always cut chassis power first.
❗ Strict Orientation Lock: This unit only works as a right‑side extender. Mixing with left‑side NA1 variants causes bus collisions and intermittent I/O drops. Label cables “RIGHT ONLY” during install.
❗ 6.5m Hard Limit: Exceeding total bus length triggers CRC errors and scan time spikes above 200ms. Use shorter cables or add repeaters for longer runs.
❗ ESD Critical: Unprotected handling can punch micro‑holes in the multilayer PCB. One site lost three units ($6,000 total) to static discharge; always ground yourself and use ESD mats.
❗ Rev Mismatch Risk: Rev B firmware may not handshake with Rev C I/O cards. Match extender revision to the rest of the S‑series system to avoid communication timeouts.
Replacement Guide
- Pre‑install: Power down chassis; lockout/tagout; take photos of existing cabling and DIP switches.
- Removal: Release front latch; pull straight out (no twisting); place in ESD bag.
- Install: Align rails; push firmly until latch clicks; route cables to the right only.
- Power‑on Test: Restore power; verify LocalBus link LED solid; run I/O scan check; log results.
FAQ
Q: Is this module hot‑swappable?A: No. It connects to the core LocalBus backplane. Hot‑swapping can damage the controller and backplane, requiring full chassis replacement.
Q: What is the warranty period?A: 12 months from shipment. The module has no user‑serviceable parts; repair requires OEM RMA and factory rework.
Q: Can I mix left and right extenders in the same bus?A: No. is right‑side only. Left‑side models use different routing logic; mixing causes bus conflicts and I/O offline events.
Q: What is the maximum distance I can run?A: 6.5 meters total for all carriers and extenders. Beyond that, signal attenuation causes CRC errors and unstable I/O.
Q: Does the module require external power?A: No. It draws 12.6 VDC, 8A from the LocalBus backplane. No separate power supply is needed.
Q: Is this part obsolete?A: No. It remains active in Emerson’s DeltaV S‑series lineup. No end‑of‑life announcement as of 2026.
Q: Can I use it with non‑DeltaV systems?A: No. It uses DeltaV’s proprietary LocalBus protocol. It will not work with ABB, Siemens, or Rockwell PLCs.
