Emerson KJ4001XI-NB1 I/O Carrier Extender

Configured for LocalBus expansion in hazardous area applications, the Emerson KJ4001XI-NB1 (KJ4001XI-NB1) I/O Carrier Extender provides direct physical and electrical bridging for DeltaV system architectures.

Hardware Specifications

Process Control and DCS Connectivity

• Hazardous Area Integration: The extender is designed for deployment in Class I, Division 2 and Zone 2 hazardous environments. It provides the necessary signal integrity and electrical isolation required to maintain system safety certifications (ATEX, IECEx, FM) when extending the LocalBus across multi-enclosure configurations.
• LocalBus Expansion: The unit serves as a critical bridge, facilitating the extension of the DeltaV LocalBus beyond a single I/O carrier. This allows for modular system scalability and physical layout optimization within complex control cabinets.
• Integrated Power Distribution: The module facilitates the distribution of 12 VDC LocalBus power and 30 VDC bussed field power across carrier interfaces. This architecture streamlines wiring requirements while ensuring stable voltage levels for downstream I/O modules and field devices.
• Environmental Adaptability: Engineered to meet ISA-S71.04-1985 Class G3 standards for airborne contaminants, the extender ensures long-term operational stability in corrosive or harsh industrial atmospheres.

Frequently Asked Questions

Q: Can this extender be removed or inserted while the system is under power?

A: No. The KJ4001XI-NB1 must not be inserted or removed with system power energized. Ensure the LocalBus and field power are de-energized before connecting or disconnecting the extender cables to prevent electrical arcing or damage to the backplane.

Q: Is there a limit to the total length of the LocalBus extension?

A: Yes. The combined length of all I/O carriers and LocalBus Extender cables must not exceed 6.5 meters. Exceeding this limit can result in signal attenuation and communication timing errors between the controller and I/O interface.

Field Installation Guidelines

• Mounting: Snap the extender onto a standard T-type DIN rail. Ensure the unit is flush with the adjacent I/O carrier and that the bus connectors are fully engaged to provide continuous electrical contact.
• Wiring: Interconnecting cables between enclosures must be routed within protective conduit to maintain safety and EMC compliance. Ensure all cables are seated firmly in the D-shell connectors.
• Grounding: Verify that the DIN rail and the cabinet chassis are bonded to a common ground bus. This provides the necessary low-impedance path for EMI suppression and keeps the extender circuitry at equipotential with the rest of the DCS node.