KJ3246X1-BA1 Emerson DeltaV S-Series Datasheet & Technical Manual

Emerson KJ3246X1-BA1 Integrated Power Fieldbus Interface

The Emerson KJ3246X1-BA1, also cataloged as the KJ3246X1-BA1 Fieldbus Interface Module, operates as a dedicated hardware component for H1 network data and power distribution within DeltaV S-Series platforms.

Hardware Specifications

FOUNDATION Fieldbus / Profibus PA Connectivity and Channel Isolation

The Emerson KJ3246X1-BA1 combines a FOUNDATION Fieldbus H1 physical layer interface with an integrated network power conditioner inside a single S-Series housing. The hardware drives deterministic 31.25 kbps H1 trunk segments, multiplexing digital control parameters and field instrument power over a single twisted-pair cable structure. The module architecture incorporates active impedance conditioning networks to prevent data wave attenuation while outputting a stable 28 to 30 VDC field circuit profile rated at 400 mA per port. Built-in channel-to-channel galvanic isolation barriers decouple independent trunk segments, preventing localized field ground faults or short circuits from interrupting communication loops across adjacent S-Series carrier ports.

Frequently Asked Questions

Q: Can this module supply power directly to intrinsically safe FISCO field instruments? A: The integrated power supply outputs 28 to 30 VDC at 400 mA per port, which fits standard non-incendive or flameproof (Ex d) Fieldbus segment requirements. For strictly intrinsically safe (Ex i / FISCO) topologies, external barrier modules or specific isolated physical layer segment protectors must be integrated down-segment to safely limit loop energy parameters.

Q: Does this S-Series interface card support online module replacement (hot-swapping)? A: Yes. The DeltaV S-Series carrier infrastructure permits hot-swapping of the interface module under live system conditions. When configured in a redundant pair arrangement, removing an active card triggers a bumpless control shift to the standby partner module without disrupting active H1 segment communications or dropping loop power.

Field Installation Guidelines

• Carrier Backplane Slot Engagement: De-energize the specific segment field loops before mounting the module. Position the card onto the designated S-Series carrier slot, ensuring absolute alignment of the rear connector pin matrix, and push downward until the integrated retention fasteners latch securely.
• Segment Terminator Architecture: Every FOUNDATION Fieldbus H1 segment requires two terminators consisting of a 100 Ohm resistor in series with a 1 microfarad capacitor. Since this card features integrated power conditioning, verify via system software whether the internal terminator is engaged, ensuring only one additional terminator is placed at the furthest physical end of the field trunk.
• Cable Shield Grounding Rules: Connect the outer braided shield of the H1 field cable to the designated shield terminal on the DeltaV carrier block, which routes directly to the plant instrument earth ground. Keep the shield floating on the field instrument enclosure side to block circulating parasitic ground currents from distorting the digital H1 waveform.