Product Details
The Emerson 396458-18-1, also cataloged as the 396458-18-1 I/O Expansion Board, operates as a dedicated hardware component for high-density signal distribution and module interface housing within DeltaV and Ovation control architectures. The unit provides physical slot alignment, backplane communications routing, and power distribution for up to 16 analog, digital, and temperature I/O modules across system expansion racks.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 396458-18-1 |
| Brand | Emerson |
| Origin | USA |
| Weight | 2.5 kg |
| Dimensions | 482.6 mm x 132 mm x 100 mm |
| Operating Temp | -20 to +70 deg C |
| Power Consumption | System backplane / Field loop powered |
| Input Voltage Range | 24 VDC or 110/220 VAC |
| Module Capacity | Up to 16 I/O modules |
| Mounting Style | DIN rail or panel-mounted |
| Environmental Protection | IP20 |
| Communication Interface | High-speed DeltaV or Ovation system bus |
| Diagnostic Visuals | LED indicators for power status, module status, and communication activity |
| Electrical Safeguards | Overvoltage protection, overcurrent protection, and signal isolation |
4-20 mA HART Loop Protocol and Channel Isolation
The expansion board incorporates systemic channel-to-channel isolation networks across the backplane bus interface to block differential ground noise between connected I/O channels. Internal bus traces maintain full pass-through integrity for 4-20 mA HART loop protocol signals, preserving digital secondary variables and HART device diagnostic data routed to controller nodes. Onboard electrical safeguards, combined with local cold junction compensation support on incoming thermal channels, prevent environmental signal drift and sustain conversion precision under severe cabinet temperature variations.
Frequently Asked Questions
Q: Can individual I/O modules installed on the 396458-18-1 base be hot-swapped during online operations?
A: Yes, provided the host DeltaV or Ovation carrier setup permits RIUP (Removal and Insertion Under Power). Replacing an I/O card interrupts processing only for the affected slot without disturbing bus communication to adjacent modules.
Q: How is primary system earth grounding established on the assembly?
A: The expansion board must be bonded directly to the cabinet functional earth bus via dedicated grounding lugs on the base chassis to ensure overvoltage protection and signal isolation circuits function correctly.
Q: What power sources can be wired to the primary power input terminals?
A: The board features a wide-range power interface accepting either direct 24 VDC industrial loop supplies or standard 110/220 VAC mains sources.
Field Installation Guidelines
- Mount the expansion base horizontally on a standard 35 mm DIN rail or bolt directly to an enclosure backpanel using the designated mounting holes.
- Connect a heavy-gauge copper conductor from the chassis ground terminal directly to the enclosure main earth grounding bus bar.
- Wire the incoming power supply line (24 VDC or 110/220 VAC) to the terminal strip, verifying line polarity and voltage levels before energizing.
- Align module rear connectors carefully with the target slot keyways on the backplane and push firmly until slot lock latches engage fully.
- Terminate all field signal cable drain shields at a dedicated single-point ground rail separate from the backplane power supply connections.
- Verify status LEDs on the base assembly to confirm proper DC bus power distribution and active system bus communication.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
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