Honeywell 51201394-100 Network Interface Components

Configured for high-integrity network signal distribution in TDC3000 environments, the Honeywell 51201394-100 (51201394-100 UCN 2-Port Drop Tap Kit) provides direct physical/electrical execution of Universal Control Network (UCN) signal branching.

Hardware Specifications

Process Control and DCS Connectivity

• 4-20 mA HART loop protocol: While operating as a physical layer component, the tap ensures that network-level traffic supporting HART-enabled controller diagnostics remains transparent and free from impedance-related signal degradation.
• FOUNDATION Fieldbus / Profibus PA connectivity: The unit serves as the physical interface for UCN-to-controller communication, facilitating the transmission of process data from fieldbus-connected controllers to the supervisory network without introducing protocol jitter.
• Channel-to-channel isolation: The tap kit provides isolated drop connections, ensuring that transient surges or ground potential variations at a single node do not propagate back through the UCN trunk line.
• Cold junction compensation (CJC): The shielded metal enclosure provides a stable electromagnetic environment for the internal impedance matching circuits, ensuring consistent signal return loss characteristics across the specified thermal range.

Frequently Asked Questions

Q: Does the 51201394-100 require external power for operation?

A: No, the drop tap is a passive hardware component designed for signal branching and impedance matching; it does not require an active power supply for operation.

Q: Can this unit be used to extend UCN cable segments beyond standard distances?

A: The tap is designed for node drops and impedance maintenance, not as a signal repeater. Exceeding recommended UCN cable lengths will result in attenuation that cannot be compensated for by this hardware.

Field Installation Guidelines

• Mounting: Secure the drop tap kit to a control cabinet panel or DIN rail. Ensure the metallic housing is in direct contact with a grounded surface to provide the required EMI/RFI shielding.
• Grounding: Bond the shielded metal enclosure to the central cabinet protective earth (PE) bus. A low-impedance ground is necessary to maintain the integrity of the network shield and prevent high-frequency noise injection into the UCN.
• Wiring: Terminate the 75 Ohm coaxial lines using BNC connectors. Maintain a minimum separation of 150 mm from high-voltage AC conduits to avoid inductive interference, and ensure the cable bend radius is not exceeded to prevent signal reflection.