The ABB NTAI01 6632115A1, also cataloged as the NTAI01 Analog Input Termination Unit, operates as a dedicated hardware component for analog loop signal conditioning and field termination within Bailey Net 90 and Infi 90 architectures.

Product Variants & Part Number Structure

• NTAI01: Standard product model designator representing the 8-channel analog input termination block assembly.
• 6632115A1: Factory spare part identification code used for hardware revision validation and direct unit substitution.

Hardware Specifications

System Execution & Bus Integration

The termination unit converts incoming 4-20 mA or 0-20 mA current signals across precision 250 OHM input resistors for high-speed digitizing. Signal data passes through system interface cables maintaining high backplane bus communication velocity to connected Infi 90 controller modules. Optimized hardware structures support I/O density scaling inside termination cabinets while preserving firmware flash compatibility across standard DCS master modules.

Scope of Delivery

• 1 x ABB NTAI01 6632115A1 Analog Input Termination Unit

Installation & Cabinet Wiring Rules

• Field Cable Termination: Connect field transmitter loop wiring directly to the screw terminals, ensuring correct polarity for 4-20 mA inputs.
• Interface Cable Connection: Attach the multi-conductor ribbon or round cable from the slave input module securely to the unit header connector.
• Earthing Guidelines: Terminate loop cable shields at the designated chassis grounding bus bar to divert high-frequency noise away from analog circuitry.

Frequently Asked Questions

• What input resistor value is used on the NTAI01 for current loop sensing?

  The unit incorporates precision 250 OHM termination resistors to convert 4-20 mA or 0-20 mA process loops into internal voltage signals.

• Is channel-to-channel isolation supported on this termination unit?

  The unit provides an overall isolation rating of 1000 VAC between field input circuitry and the system backplane logic.

• What power supply voltage does the NTAI01 require for operation?

  The termination board draws its required operational logic power from a regulated +5 VDC system supply rail.

• What is the signal conversion accuracy of the NTAI01 input channels?

  The analog input termination channels maintain an accuracy rating within +/-0.15% of full scale across standard operating limits.

• Can the unit be mounted inside a standard termination subrack?

  Yes, the physical dimensions and mounting holes match standard Bailey Net 90 / Infi 90 mounting subrack dimensions.

• What update rate is achieved across the 8 analog input channels?

  The onboard signal conversion and sampling cycle updates process values in less than 100 ms per active channel.

• How are input signal types selected on the termination unit?

  Input signal ranges (4-20 mA or 0-20 mA) are determined by field transmitter wiring configuration and upstream software settings.

• What steps prevent ground loops on shielded analog cables?

  Ensure signal cable shields are grounded at only one point, typically at the termination unit grounding bar inside the cabinet.