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- ABB Bailey
- NTAI05-A
- 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 NTAI05-A Analog Input Terminal Unit is a field termination module used in ABB Bailey INFI 90 / Net 90 Distributed Control Systems (DCS). It provides structured wiring and signal termination for multiple analog input signals coming from field instruments such as transmitters, sensors, and industrial measurement devices.
The “-A” variant typically indicates a revised or application-specific version within the NTAI05 series, while maintaining the same core role as an analog input termination interface.
It functions as the front-end interface layer between field wiring and analog input processing modules.
Technical Specifications
| Item | Details |
|---|---|
| Manufacturer | ABB (Bailey) |
| Model | NTAI05-A |
| 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 | Multi-channel analog inputs (system dependent) |
| Signal Types | 4–20 mA, voltage, RTD, thermocouple (depending on configuration) |
| Installation Type | Control cabinet / termination assembly |
Function Description
The NTAI05-A is used to terminate and organize analog field wiring signals before they are processed by the DCS system.
Its main functions include:
- Providing termination points for analog input signals
- Supporting multiple field instrument connections
- Routing signals to analog input slave modules
- Organizing complex field wiring in control cabinets
- Improving maintenance efficiency and signal traceability
It does not perform signal conversion or processing; it is strictly a termination interface unit.
Working Principle
The module operates within the analog signal acquisition chain:
- Field instruments generate analog process signals
- Signals are wired into the NTAI05-A terminal points
- The unit routes signals to analog input slave modules
- Slave modules perform signal conditioning and analog-to-digital conversion
- Controller modules use processed data for monitoring and control
This structure ensures stable and organized signal handling across the system.
System Role
Within ABB Bailey DCS architecture, the NTAI05-A performs:
- Analog signal termination
- Field wiring organization
- Signal routing to I/O modules
- Support for multi-channel analog acquisition
- Front-end interface for process instrumentation
It belongs to the input interface layer of the control system.
Industrial Applications
The ABB NTAI05-A is used in:
- Power generation plants
- Oil and gas 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 racks
- Connected directly to field instrumentation wiring
- Interfaces with analog input slave modules (e.g., IMASI/IMASM series)
- Requires proper grounding and shielding practices
- Installed by qualified instrumentation engineers
- Integrated into 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 termination modules
- INFI 90 / Net 90 system backplane architecture
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| NTAI05-A | Analog input terminal unit | Revised version of NTAI05 | Standard analog I/O termination |
| NTAI05 | Analog input terminal unit | Base model | Field signal interface |
| NTAI04 | Analog input terminal unit | Earlier revision | Standard analog wiring |
| IMASI05 | Analog input slave module | Signal conversion & processing | DCS input layer |
| NIAI05 | Analog input module | Direct acquisition module | Control system processing |
Key Advantages
- Structured multi-channel analog wiring
- Improves signal stability and reliability
- Reduces control cabinet wiring complexity
- Strong compatibility with ABB Bailey systems
- Suitable for large-scale industrial processes
- Supports long-term operation in harsh environments
- Simplifies maintenance and troubleshooting
Technical FAQs
Q1: What is the main difference of NTAI05-A?
It is a revised or variant version of the NTAI05 terminal unit, typically with minor design or manufacturing updates.
Q2: Does it process signals?
No. It only handles termination and routing of analog signals.
Q3: What systems use it?
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 connections into the control system.
Conclusion
The ABB Bailey NTAI05-A Analog Input Terminal Unit is an essential interface component in ABB Bailey distributed control systems. It provides structured termination and routing for multiple analog signals, ensuring stable and reliable data flow into system I/O modules.
It is widely used in industrial environments such as power plants, petrochemical facilities, and process automation systems where accurate analog signal acquisition is critical for safe and efficient operation.