NTAM01 | ABB Bailey | Analog Master Termination Unit

ABB Bailey NTAM01 Analog Master Termination Unit

The ABB Bailey NTAM01 is an Analog Master Termination Unit for the INFI 90 and Net 90 distributed control systems. It serves as the central analog signal termination and routing hub, connecting field instrumentation to INFI 90 analog I/O modules while providing calibration routing and cold-junction compensation reference transfer for thermocouple applications.

Key Specifications

• Part Number: NTAM01
• Product Type: Analog Master Termination Unit
• Series: INFI 90 / Net 90 / Symphony
• Manufacturer: ABB / Bailey Controls
• Origin: Sweden / USA
• Function: Centralized analog signal termination, routing, and calibration support
• Supported Signal Types: 0–10 V, 4–20 mA (low-level industrial analog signals)
• Maximum Analog Channels: 16 channels
• Supported Analog Input Units: Up to 4 × NTAI02
• Supported Indicator Stations: Up to 4 × NDIS01 / NDISe1
• Calibration Routing: Via IMAMM03 Analog Master Module
• Cold-Junction Compensation: Supported (for thermocouple applications)
• Electrical Isolation: 1500 V AC (some sources); designed to maintain analog signal integrity
• Resolution: 14-bit (system-dependent)
• Power Requirement: Passive device (no external power required per some sources); +24 VDC at ~17 mA (other configurations); +5 VDC (alternative spec)
• Power Consumption: 6 Watts (typical)
• Operating Voltage: +24 VDC
• Operating Temperature: 0°C to +60°C (32°F to 140°F); some sources list -20°C to +60°C or -10°C to +55°C
• Storage Temperature: -40°C to +85°C (-40°F to 185°F); some sources list -20°C to +70°C
• Relative Humidity: 5% to 95% non-condensing
• Shock Resistance: 10g
• Dimensions: 7.0" × 1.0" × 8.0" (178 × 25 × 203 mm) or 17.8 × 2.5 × 20.3 cm
• Weight: 0.2 kg (0.44 lbs) to 1.0 kg (2.2 lbs) depending on configuration and source
• Mounting Style: Rack-mounted; fits standard NFTP01 Field Termination Panel
• Terminal Type: Screw terminal blocks
• Connection Method: Factory-wired cables for module-to-module and indicator station connections
• Mechanical Construction: Industrial-grade materials for continuous service
• Tariff Code: 8537101190

Features & Benefits

1. Centralized Analog Termination: Consolidates up to 16 analog channels into a single organized termination point, simplifying cabinet wiring and maintenance.
2. Multi-Unit Expansion: Interfaces with up to four NTAI02 analog input termination units, providing scalable I/O capacity.
3. Calibration Support: Routes calibration voltage from the IMAMM03 module, enabling in-situ sensor calibration without disconnecting field wiring.
4. Cold-Junction Compensation: Passes thermocouple cold-junction reference signals for accurate temperature measurement.
5. Indicator Station Interface: Supports up to four NDIS01/NDISe1 digital indicator stations for local process variable display.
6. Standardized Cabling: Factory-wired cables simplify connections between modules, termination units, and indicator stations.
7. Passive Design: No external power required in standard configuration, reducing installation complexity and power supply loading.
8. Industrial Durability: Rugged construction withstands vibration, temperature cycling, and electrical noise in continuous process environments.

Applications

• Power generation boiler and turbine analog I/O termination
• Petrochemical process variable signal routing
• Water treatment plant analog sensor interfacing
• Continuous manufacturing line control cabinets
• Process automation cabinet signal management
• Distributed control system analog I/O expansion

System Integration

The NTAM01 is commonly paired with:

• NTAI02 — Analog Input Termination Units (up to 4 units)
• NDIS01 / NDISe1 — Digital Indicator Stations (up to 4 stations)
• IMAMM03 — Analog Master Module (for calibration routing)
• IMASI02 / IMASI03 — Analog Input Slave Modules
• IMASO01 — Analog Output Slave Module
• NFTP01 — Field Termination Panel (mounting chassis)

FAQ

Q: Is the NTAM01 an active signal processing module?
A: No. The NTAM01 is a passive termination and routing assembly. It organizes, terminates, and distributes analog signals but does not perform A/D conversion or signal conditioning. Active processing is performed by IMASIxx and IMASOxx slave modules.

Q: What is the maximum number of analog channels the NTAM01 can support?
A: The NTAM01 supports up to 16 analog channels distributed across up to four NTAI02 analog input termination units.

Q: How does the NTAM01 handle thermocouple cold-junction compensation?
A: The NTAM01 passes cold-junction compensation reference signals from the termination environment to the analog input modules. Ensure the CJC sensor is properly located near the termination point for accurate temperature measurement.

Q: Can I use the NTAM01 with Net 90 systems?
A: Yes. The NTAM01 is backward compatible with both INFI 90 and Net 90 control platforms, as well as Symphony Harmony systems.

Q: What is the difference between NTAM01 and NTAI02?
A: The NTAM01 is the master termination unit that aggregates and routes signals to multiple NTAI02 units. The NTAI02 is the analog input termination unit that interfaces directly with field sensors. The NTAM01 sits upstream of the NTAI02 units in the signal path.

Q: Does the NTAM01 require external power?
A: Most configurations are passive and require no external power. Some integrated variants may require +24 VDC at approximately 17 mA for indicator station interfaces or calibration routing circuits. Verify your specific configuration.

Installation Guide

1. Mount the NTAM01 into a standard NFTP01 Field Termination Panel slot.
2. Connect field analog signal wires to the screw terminal blocks per the wiring schedule.
3. Install factory-wired cables between NTAM01 and up to four NTAI02 units.
4. Connect NDIS01/NDISe1 indicator stations if local display is required.
5. Wire IMAMM03 calibration routing cable to the NTAM01 calibration port.
6. Verify all shield grounds are bonded to the panel ground bus at one end only.
7. Perform continuity tests and verify signal integrity before energizing the system.
8. Configure channel scaling and engineering units in the MFP function blocks.