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- ABB Bailey
- NTAI02 6634679F1
- Analog Input Terminal Unit
- Sweden (SE)
- 78.74 x 215.9 x 233.68 mm
- 0.54 kg
- Xiamen, China
- New & In Stock
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Product Overview
The ABB Bailey NTAI02 (Part No. 6634679F1) is an Analog Input Terminal Unit used in ABB Bailey INFI 90 / Net 90 Distributed Control Systems (DCS). It is designed to provide a structured termination interface for multiple analog field signals, such as those coming from transmitters for pressure, temperature, flow, and level measurement.
This module acts as the physical wiring and signal conditioning interface layer between field instruments and analog input slave modules in the DCS system.
Technical Specifications
| Item | Details |
|---|---|
| Manufacturer | ABB (Bailey) |
| Model | NTAI02 |
| Part Number | 6634679F1 |
| Product Type | Analog Input Terminal Unit |
| System Compatibility | INFI 90 / Net 90 DCS |
| Function | Analog signal termination and routing |
| Dimensions | 78.74 × 215.9 × 233.68 mm |
| Weight | 0.54 kg |
| Input Channels | Multiple analog input channels (system dependent, typically 16) |
| Signal Types | 4–20 mA / voltage / thermocouple (system dependent configuration) |
| Installation Type | Field termination panel / rack-mounted unit |
Function Description
The NTAI02 is used to organize and terminate analog field wiring signals before they are processed by the DCS system.
Its main functions include:
- Providing termination points for analog sensor wiring
- Supporting multiple analog input channels
- Routing field signals to analog input slave modules
- Allowing structured connection of transmitters and sensors
- Reducing wiring complexity inside control cabinets
It does not perform signal conversion or control logic; it serves as a termination and interface unit.
Working Principle
The module operates as part of the analog input acquisition chain:
- Field instruments generate analog signals (e.g., 4–20 mA)
- Signals are wired into the NTAI02 terminal points
- The unit routes signals to analog input modules (slave modules)
- Input modules perform A/D conversion
- Controller modules use the processed digital data for control logic
This ensures clean signal organization and reliable data acquisition.
System Role
Within ABB Bailey DCS architecture, the NTAI02 performs:
- Analog signal termination
- Field wiring organization
- Signal routing to I/O modules
- Support for multi-channel analog acquisition
- Interface layer between field and control system
It is part of the front-end signal interface structure.
Industrial Applications
The ABB NTAI02 is used in:
- Power generation plants
- Oil and gas processing facilities
- Petrochemical industries
- Water treatment systems
- Industrial automation systems
- Process monitoring and control systems
- ABB Bailey INFI 90 / Net 90 installations
Installation and Integration
- Installed in control cabinets or termination panels
- Connected directly to field instrumentation wiring
- Interfaces with analog input modules (e.g., IMASI series)
- Requires proper grounding and shielding practices
- Installed by qualified instrumentation engineers
- Used as part of system I/O architecture
Compatible System Components
- ABB Bailey IMASI / IMASM analog input modules
- ABB Bailey NMFC / NMFP controller modules
- ABB Bailey NLIM loop interface modules
- ABB Bailey NPTM point table modules
- ABB Bailey NRDI / NRAI terminal modules
- INFI 90 / Net 90 system backplane architecture
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| NTAI02 | Analog input terminal unit | Standard multi-channel termination | Field signal interface |
| NRAI01 | Analog input terminal | Simplified analog termination | Small-scale I/O |
| IMASI02 | Analog input module | Signal conversion and processing | Control system I/O |
| NIAI01 | Analog input module | High-level data acquisition | DCS processing layer |
| NTDI01 | Digital input terminal | Digital signal termination | On/off signal handling |
Key Advantages
- Organized multi-channel analog signal termination
- Reduces field wiring complexity
- Improves signal reliability and maintenance
- Strong compatibility with ABB Bailey systems
- Stable operation in industrial environments
- Supports large-scale process instrumentation
- Long service life in control system cabinets
Technical FAQs
Q1: What is the main function of NTAI02?
It provides termination and routing for analog input signals from field instruments.
Q2: Does it convert signals?
No. Signal conversion is done by analog input modules, not the terminal unit.
Q3: Where is it used?
It is used in ABB Bailey INFI 90 and Net 90 distributed control systems.
Q4: Why is it important?
Because it ensures organized and reliable analog signal wiring into the control system.
Conclusion
The ABB Bailey NTAI02 (6634679F1) Analog Input Terminal Unit is a key interface component in ABB Bailey distributed control systems. It provides structured termination and routing for multiple analog field signals, ensuring reliable data flow into the control system’s I/O modules.
It is widely used in industrial environments such as power plants, petrochemical facilities, and process automation systems where accurate and stable analog signal acquisition is essential.