Honeywell 8U-TAOXB1 Series 8 Analog Output Module

The Honeywell 8U-TAOXB1, also cataloged as the 8U-TAOXB1 Process Control Module, operates as a dedicated hardware component for 16-channel current loop drive generation within Honeywell Experion PKS and TPS platforms.

Hardware Specifications

4-20 mA HART Loop Protocol and Galvanic Channel Isolation

The Honeywell 8U-TAOXB1 drives up to 16 independent analog output loops across a load resistance span of 50 to 800 ohms, delivering 4-20 mA signals with an output resolution of +/-0.05% of full scale. Integrated digital-to-analog converter (DAC) channels feature built-in 4-20 mA HART loop protocol support, enabling bi-directional digital frequency-shift keying (FSK) pass-through for online field device configuration and diagnostics. Internal 500 VDC galvanic isolation separates system backplane logic from field-side circuits, suppressing common-mode noise and preventing transient ground loops from corrupting critical actuator drive commands.

Frequently Asked Questions

Q: What is the maximum load resistance supported per channel on the 8U-TAOXB1?

A: The module drives current loop outputs into loads ranging from 50 to 800 ohms at 24 VDC nominal power.

Q: Can the 8U-TAOXB1 be replaced while the system backplane remains powered?

A: Yes, the module features hot-swappable architecture, allowing online insertion and removal without interrupting adjacent I/O channels or control bus communication.

Q: What isolation level is provided between the control system and field wiring?

A: The module provides 500 VDC electrical isolation between system backplane circuits and field-side wiring loops.

Field Installation Guidelines

1. Verify that cabinet power supplies maintain a regulated 24 VDC output prior to module energization.
2. Align the module card edges with the carrier slot guides of the Experion Series 8 assembly.
3. Slide the 8U-TAOXB1 firmly into the carrier until the backplane interface connectors are fully seated.
4. Tighten top and bottom module captive mounting screws to establish continuous chassis ground bonding and mechanical stability.
5. Terminate 4-20 mA field actuator loops using twisted-shielded pair conductors, landing wire drain shields at the dedicated enclosure earth ground bar.
6. Verify loop load impedance remains within the specified 50 to 800 ohm limits before enabling channel output loops in system software.