Component Snapshot At-a-Glance
- Model:
- Alt. P/N: 12P0818X072,12P0818X092
- Product Series: Emerson DeltaV M-Series Standard I/O System
- Hardware Type: Passive 8-wide terminal base carrier with full-length integrated EMI shield bar
- Key Feature: Integrated metal shield bar bonded to chassis ground to suppress cabinet-borne EMI noise from variable frequency drives
- Primary Field Use: Mounts 8 individual DeltaV plug-in I/O modules, terminates all field wiring and routes LocalBus/field power between I/O card and rack backplane
Hard-Numbers: Technical Specifications
- Slot Count: 8 independent module mounting positions per base unit
- Protocol Support: DeltaV proprietary LocalBus backplane, compatible with HART-enabled I/O cards
- LocalBus Input: 12.6VDC @ max 8A from upstream KJ4002X1-BC1 carrier
- Bussed Field Power Rating: Max 30VDC @6.5A aggregated field feed across all channels
- Operating Temperature: -40°C ~ +70°C ambient cabinet rating per FM/ATEX specs
- Vibration Rating: 0.7g @13.2–150Hz,1mm pp @2–13.2Hz (ISA-S71.04 G3 industrial contaminant grade)
- Isolation Rating: No onboard channel isolation; isolation implemented on paired plug-in I/O modules
- Mount Spec: EN60715 standard 35mm DIN rail snap-in installation
- Weight: 0.69kg nominal per unit
- Certifications: UL,CSA,FM Class I Div2,ATEX II3G,IECEx certified
The Real-World Problem It Solves
Unshielded generic terminal bases pick up VFD switching noise inside motor control adjacent cabinets, triggering sporadic AI drift and intermittent DI dropout alarms. Split single/dual slot bases force messy stacked wiring that crowds cabinet marshall space during incremental I/O expansion.
Where you’ll typically find it:
- Refinery crude feed DCS cabinet racks adjacent pump VFD enclosures
- Coal power plant boiler drum level control I/O marshall panels
- Chemical batch reactor field termination cabinets with mixed HART analog/digital wiring
It consolidates 8-point termination onto one DIN footprint while factory-integrated grounding shield cuts field EMI troubleshooting hours on noisy plant floors.
Hardware Architecture & Under-the-Hood Logic
Entirely passive PCB construction with zero embedded microprocessors; solid copper internal traces split LocalBus power, field bus and communication lines, plus a full-length bonded metal shield bar tied to protective earth for noise mitigation.
- Rear edge gold edge fingers mate directly to KJ4002X1-BC1 backplane to pull regulated LocalBus power and LocalBus data onto base PCB traces.
- Internal layered PCB splits incoming LocalBus voltage evenly across all eight card slot contact sets.
- Separate dedicated trace paths route user-supplied bussed field power out to front screw terminal blocks for field cable termination.
- Front slot spring gold contacts complete power/signal path once DeltaV I/O module locks into place.
- Full-width top shield bar mechanically latches to base chassis, pre-wired to earth lug to shunt stray cabinet EMI to ground potential.
Field Service Pitfalls: What Rookies Get Wrong
Unbonded Shield Bar From Cabinet Protective Earth
New techs skip connecting base ground lug to cabinet PE bar; floating shield renders EMI bar useless, resulting in erratic fluctuating analog readings near drive cabinets.
- Field Rule: Run 14AWG green ground wire from base earth terminal straight to cabinet master ground bus before wiring any field loops.
Empty Slots Left Uncovered Without Blanking Plugs
Open unused slots break shield continuity, creating EMI ingress gaps that bleed noise into adjacent active channels.
- Quick Fix: Install KJ4001X1-FA1 factory blank covers on all permanently vacant slot positions per DeltaV cabinet layout standard.
Over-Torquing Front Field Terminals Splitting PCB Internal Traces
Excessive screwdriver torque on front terminal screws cracks buried power traces, creating high-resistance intermittent field power faults that only surface during cabinet thermal cycling.
- Field Rule: Torque all field screw terminals to factory 0.7–0.9Nm specified range; discard base if any terminal post pulls loose from molded housing.
Commercial Availability & Pricing Note
Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.
