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- ABB Bailey
- NTDI02
- Digital I/O Termination Unit
- Sweden (SE)
- 330 × 180 × 50 mm
- 0.3 kg
- Xiamen, China
- New & In Stock
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Product Overview
The ABB Bailey NTDI02 Infi 90 Digital I/O Termination Unit is a field wiring interface used within Infi 90 control systems for organizing connections associated with digital input and output circuits. It provides a structured termination point between cabinet wiring and the corresponding Infi 90 digital I/O equipment.
Digital I/O circuits are used throughout industrial control systems for equipment status, interlocks, permissive signals, commands, and discrete control functions. By concentrating these connections at a dedicated termination unit, the NTDI02 helps maintain an orderly wiring arrangement between field devices and the active control-system hardware.
For maintenance technicians, a dedicated digital I/O termination point makes individual circuits easier to identify and trace. This is useful when diagnosing an unexpected equipment status, a missing input, or an output command that does not reach the intended field device.
The NTDI02 belongs to the termination layer of the Infi 90 architecture rather than the control-processing layer. Signal interpretation and control logic remain the responsibility of the associated I/O and controller hardware.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB Bailey |
| Model | NTDI02 |
| Product Family | Infi 90 |
| Product Series | NTDI |
| Product Type | Digital I/O Termination Unit |
| Primary Function | Digital input and output field-wiring termination |
| System Role | Digital I/O connection interface |
| Application | Infi 90 digital I/O circuits |
| Installation | Control cabinet / termination panel |
| Dimensions | 330 × 180 × 50 mm |
| Weight | 0.3 kg |
Product Features
- Infi 90 digital I/O termination unit
- Supports termination of digital input and output wiring
- Provides an organized interface between field circuits and I/O hardware
- Suitable for discrete status, command, and interlock circuits
- Simplifies identification and tracing of digital I/O wiring
- Supports control cabinet maintenance and troubleshooting
- Suitable for existing ABB Bailey Infi 90 installations
- Useful for legacy system replacement and refurbishment work
Working Principle
The NTDI02 serves as the connection point through which digital input and output circuits are terminated and routed within the Infi 90 control system.
For an input circuit, a discrete signal from a field device travels through the field wiring and termination arrangement toward the associated digital input circuitry.
Field Input Device → Field Wiring → NTDI02 → Infi 90 Digital Input → Controller
For an output circuit, the signal direction is reversed. A command generated by the controller is transferred through the digital output circuitry and termination arrangement to the connected field equipment.
Controller → Infi 90 Digital Output → NTDI02 → Field Wiring → Field Device
The NTDI02 itself does not execute application logic or determine the required machine action. Its purpose is to maintain the physical connection and organization of the digital I/O circuits.
Because the unit serves both input and output wiring, troubleshooting should consider the direction of the affected signal. An input problem generally requires checking the field device and incoming circuit, while an output problem may require checking the controller command, output channel, termination connection, and field load.
Role in Infi 90 Control Architecture
The NTDI02 sits between field wiring and the active digital I/O circuitry in an ABB Bailey Infi 90 installation.
Field Devices ↔ Field Wiring ↔ NTDI02 ↔ Digital I/O ↔ Infi 90 Controller ↔ Operator Interface
| System Element | Function |
|---|---|
| Field Input Devices | Generate discrete equipment or process status |
| Field Output Devices | Receive discrete control commands |
| Field Wiring | Carries digital signals between equipment and cabinet |
| NTDI02 | Terminates and organizes digital I/O connections |
| Digital I/O Hardware | Detects inputs and generates output signals |
| Infi 90 Controller | Executes control logic and sequencing |
| Operator Interface | Displays status and allows configured operator commands |
This arrangement gives the control cabinet a defined wiring interface while leaving signal processing and application control to the appropriate active Infi 90 components.
Industrial Applications
| Application | Typical Use |
|---|---|
| Power Generation | Generator, turbine, and auxiliary equipment status and commands |
| Process Control | Discrete valve, pump, motor, and interlock signals |
| Chemical Plants | Process permissives, alarms, and equipment feedback |
| Oil & Gas Facilities | Discrete equipment monitoring and control |
| Water Treatment | Pump, valve, and equipment status circuits |
| Industrial Utilities | Motor and auxiliary equipment control |
| Manufacturing Equipment | Machine status, interlocks, and discrete commands |
| Infi 90 Retrofit Projects | Replacement of existing digital I/O termination hardware |
Installation and Maintenance
- Install the NTDI02 at the designated Infi 90 digital I/O termination location.
- Verify the mounting arrangement before connecting any field wiring.
- Identify input and output circuits using the applicable electrical drawings.
- Confirm terminal assignments before disconnecting an existing termination unit.
- Connect each conductor to its designated termination point.
- Ensure all connections are mechanically secure after wiring.
- Keep input and output wiring clearly identified and properly routed.
- Check for loose, damaged, or incorrectly terminated conductors during maintenance.
- Verify field-device continuity when an expected digital input is missing.
- Check the corresponding output circuit and field load when an output command is not received.
- Inspect the termination assembly for contamination, corrosion, overheating, or mechanical damage.
- After replacement, test all affected digital input and output circuits before returning the Infi 90 system to normal operation.
Compatible System Components
| Component | Function |
|---|---|
| ABB Bailey Infi 90 Controller | Executes control logic and process sequencing |
| Infi 90 Digital Input Modules | Receives discrete field signals |
| Infi 90 Digital Output Modules | Sends discrete commands to field equipment |
| NTDI02 | Provides digital I/O field-wiring termination |
| Field Terminal Wiring | Connects field devices to the termination interface |
| Limit Switches | Provides discrete position feedback |
| Auxiliary Contacts | Provides motor and equipment status |
| Solenoid Valves / Relays | Receives discrete control outputs |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| ABB Bailey NTDI01 | Digital Input Termination Unit | Infi 90 digital input termination |
| ABB Bailey NTDI02 | Digital I/O Termination Unit | Infi 90 digital input and output termination |
| ABB Bailey NTDO01 | Digital Output Termination Unit | Infi 90 digital output termination |
| ABB Bailey NTCS01 | Control I/O Termination Unit | Infi 90 control signal termination |
| ABB Bailey NTCS02 | Control I/O Termination Unit | Infi 90 control signal termination |
| ABB Bailey NTCS04 | Control Station Termination Unit | Infi 90 control station wiring |
| ABB Bailey NTCU01 | Serial Interface Termination Unit | Infi 90 serial communication wiring |
Key Advantages
- Handles termination requirements for both digital input and output circuits
- Provides a centralized connection point for discrete field wiring
- Makes input and output circuit tracing easier during maintenance
- Helps organize complex Infi 90 cabinet wiring
- Supports faster isolation of field wiring and I/O connection problems
- Suitable for maintenance and refurbishment of legacy Infi 90 systems
Technical FAQs
When should an NTDI02 be considered instead of a digital input-only termination unit?
The NTDI02 is appropriate when the wiring arrangement includes both digital input and digital output circuits. A digital input-only termination unit is more suitable when the installation requires termination exclusively for incoming discrete signals.
How can an NTDI02-related fault be distinguished from an I/O module fault?
Check the affected field circuit at the termination point first. Verify the terminal connection and wiring continuity, then check the corresponding I/O channel and controller status. This separates physical termination problems from faults in the active I/O hardware.
What is the correct troubleshooting direction for an output that does not operate?
Start with the controller command and corresponding digital output channel, then follow the signal toward the NTDI02 termination point, field wiring, and final load. This helps identify whether the problem originates in control logic, the output channel, the termination connection, or the field device.
Why is correct circuit identification important when replacing the NTDI02?
The unit can serve multiple digital input and output circuits, so incorrect reconnection can affect more than one control function. Existing terminal assignments and electrical drawings should be verified before transferring wiring to replacement hardware.