The ABB NTAO01, also cataloged as the NTAO01 Analog Output Termination Module, operates as a dedicated hardware component for field signal termination and analog control output distribution within Bailey Net 90 and Infi 90 platforms.

Technical Identifier Matrix

Hardware Specifications

Distributed Control System Channel Isolation and Processing

The ABB NTAO01 handles analog current loop conditioning across Bailey Net 90 and Infi 90 control node architectures. Each of the 4 independent output channels processes 12-bit digital conversions to drive standard 4-20 mA industrial field instrumentation. The integrated galvanic barrier delivers 500 VAC isolation between field connections and logic circuits, suppressing common-mode line interference and ground loop potential differences. System bus access latency remains fixed at a 100 ms update rate per channel, maintaining deterministic execution for closed-loop regulatory control logic.

Package Contents & Ordering Information

• 1x ABB NTAO01 Analog Output Termination Unit
• 1x Product Documentation Sheet

Field Installation Guidelines

• Cabinet Mounting: Secure the module into the designated Net 90 / Infi 90 mounting slot. Verify that rear backplane connectors line up before applying seating force.
• Wiring Termination: Terminate 4-20 mA current loop wiring at the designated screw terminal points. Ensure correct polarity (+/-) for each of the 4 output channels.
• Shielding and Grounding: Ground signal cable shields at a single chassis ground point on the termination assembly. Do not ground field ends to avoid dual-ground loops.
• Power Connections: Confirm the control cabinet +5 VDC bus power supply is stable and within operating limits prior to energizing the module.

Frequently Asked Questions

• What primary function does the NTAO01 unit perform in a DCS cabinet?

  The module provides physical field wiring connections, signal conditioning, and 500 VAC isolation for 4 analog current loop output channels.

• What supply voltage does the NTAO01 module require for logic operation?

  The module operates directly from a regulated +5 VDC backplane power distribution line.

• How many field devices can a single NTAO01 module drive simultaneously?

  The unit contains 4 independent output channels, allowing simultaneous control of up to 4 distinct 4-20 mA field actuators or positioners.

• What is the D/A conversion resolution of the NTAO01 output channels?

  The termination module converts digital control values to analog loop currents using 12-bit resolution across the full 4-20 mA span.

• What is the maximum update interval per channel on the NTAO01?

  The module updates field current levels at a fixed rate of 100 ms per output channel.

• Can the NTAO01 withstand high common-mode voltages between field wiring and logic grounds?

  Yes, the module includes continuous galvanic isolation rated up to 500 VAC between field circuitry and backplane logic.

• What ambient temperature range is allowable during operation?

  The module operates continuously within an ambient temperature window of 0 deg C to +60 deg C.

• What type of field signal standards does the NTAO01 support?

  The module supports standard 4-20 mA DC industrial current loops.