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- ABB Bailey
- NTDO02
- Digital Output Termination Unit
- Sweden (SE)
- 78.74 × 205.74 × 205.74 mm
- 0.34 kg
- Xiamen, China
- New & In Stock
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- 1 Year
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Product Overview
The ABB Bailey NTDO02 Infi 90 Digital Output Termination Unit is a field-wiring interface used to connect digital output circuits from an ABB Bailey Infi 90 control system to external plant equipment. It provides a dedicated termination point between the active I/O electronics and discrete field devices.
Digital output circuits are commonly used for commands such as valve actuation, relay energization, motor start/stop signals, alarm outputs, and equipment interlocks. The NTDO02 organizes these field connections so that output signals from the control system can be routed to the appropriate external circuits.
The unit is a termination component rather than an independent controller or signal-processing module. Control logic remains within the associated Infi 90 controller and I/O electronics, while the NTDO02 handles the physical field connection layer.
For commissioning and maintenance, the termination unit provides a practical point for checking output wiring and signal paths. Incorrect terminal assignment, loose wiring, or a poor connection between the termination unit and I/O electronics can prevent an otherwise valid output command from reaching the field device.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB Bailey |
| Model | NTDO02 |
| Product Family | Infi 90 |
| Product Type | Digital Output Termination Unit |
| Primary Function | Digital output field-signal termination |
| System Role | Digital output field-wiring interface |
| Application | Infi 90 industrial process control systems |
| Dimensions | 78.74 × 205.74 × 205.74 mm |
| Weight | 0.34 kg |
Product Features
- Infi 90 Digital Output Termination Unit
- Provides a dedicated interface for digital output field wiring
- Connects compatible Infi 90 I/O electronics with external field circuits
- Suitable for discrete control signals and equipment commands
- Supports organized field wiring within industrial control installations
- Useful for relay, actuator, alarm, and interlock output circuits
- Passive termination component without independent control logic
- Suitable for commissioning, maintenance, and replacement applications
Working Principle
The NTDO02 provides the physical connection between the digital output channels of the Infi 90 I/O system and the external field circuits. A control command generated by the controller is processed by the associated I/O electronics and then transferred through the termination arrangement to the connected field device.
Infi 90 Controller → Digital Output I/O → NTDO02 → Field Wiring → Actuator / Relay / Indication Device
When an output channel changes state, the corresponding electrical condition is presented through the NTDO02 termination point. The connected field equipment then responds according to its own electrical and control characteristics.
The NTDO02 does not determine when an output should operate. It maintains the physical signal path between the active I/O circuitry and field wiring. A problem at the termination point can therefore appear as a failed output even though the controller and I/O logic are functioning correctly.
Role in an ABB Bailey Infi 90 Digital Output Architecture
The NTDO02 occupies the field termination layer of an Infi 90 digital output system. It sits between the active digital output electronics and the plant wiring used by external discrete devices.
Infi 90 Controller → Digital Output Module → NTDO02 → Field Wiring → External Equipment
| System Element | Function |
|---|---|
| Infi 90 Controller | Executes control logic and operating sequences |
| Digital Output Module | Generates configured discrete output states |
| NTDO02 | Terminates and interfaces digital output wiring |
| Field Wiring | Carries output commands to external equipment |
| Relay / Interface | Transfers or isolates the output circuit |
| Actuator | Performs the commanded physical action |
| Alarm / Indication | Provides discrete equipment or process indication |
This arrangement separates controller logic and active I/O processing from the physical field-wiring interface, making individual output circuits easier to identify during commissioning and troubleshooting.
Industrial Applications
| Application | Typical Use |
|---|---|
| Process Automation | Termination of discrete control outputs |
| Valve Control | Routing commands to compatible valve circuits |
| Motor Control | Interface for start/stop and auxiliary circuits |
| Power Generation | Discrete commands for plant equipment |
| Boiler and Turbine Systems | Equipment control and interlock outputs |
| Chemical Processing | Actuator and auxiliary equipment control |
| Oil and Gas Facilities | Field output signal termination |
| Water Treatment | Control of pumps, valves, and auxiliary devices |
| Industrial Utilities | Discrete output wiring organization |
Installation and Maintenance
- Verify that the NTDO02 matches the intended Infi 90 digital output termination arrangement.
- Review the approved control-system drawings before disconnecting existing field wiring.
- Isolate the relevant output circuits according to applicable maintenance and safety procedures.
- Inspect the NTDO02 for physical damage, contamination, or loose components.
- Confirm terminal identification and output-channel assignments against the system documentation.
- Check field conductors for damaged insulation, loose terminals, or incorrect wiring.
- Verify the connection between the NTDO02 and the associated Infi 90 digital output electronics.
- Confirm that the connected field load is appropriate for the complete output circuit.
- Energize the system under controlled commissioning conditions.
- Test each affected output channel using an approved commissioning procedure.
- Compare the controller command, I/O output state, termination point, and actual field-device response when troubleshooting.
- After replacement, verify all affected output circuits and complete the required functional test before returning the process to normal operation.
Compatible System Components
| Component | Function |
|---|---|
| ABB Bailey Infi 90 Controller | Executes process-control and sequencing logic |
| Infi 90 Digital Output Module | Generates discrete output signals |
| NTDO02 | Terminates digital output field wiring |
| Field Terminal Wiring | Carries output signals to connected equipment |
| Interposing Relay | Provides switching or electrical interface |
| Solenoid Valve | Performs a discrete process-control action |
| Motor Starter | Provides motor start/stop control |
| Alarm / Indication Device | Provides equipment or process status indication |
| Field Actuator | Performs the commanded physical operation |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| ABB Bailey NTDO02 | Digital Output Termination Unit | Infi 90 digital output termination |
| ABB Bailey NTDO01 | Digital Output Termination Unit | Infi 90 output field interfacing |
| ABB Bailey NTDI21 | Digital I/O Termination Unit | Infi 90 digital I/O field interface |
| ABB Bailey NTDI02 | Digital I/O Termination Unit | Infi 90 digital signal termination |
| ABB Bailey NTDI01 | Digital Input Termination Unit | Infi 90 digital input interfacing |
| ABB Bailey NTCU01 | Serial Interface Termination Unit | Infi 90 serial communication interface |
| ABB Bailey NTCS04 | Control Station Termination Unit | Infi 90 control station interfacing |
| ABB Bailey Infi 90 Series | Distributed Control System | Industrial process automation |
Key Advantages
- Provides a dedicated termination interface for Infi 90 digital output circuits.
- Organizes field wiring for discrete control commands.
- Separates field connections from active controller and I/O electronics.
- Supports practical channel-level commissioning and troubleshooting.
- Suitable for valves, relays, alarms, motor-control circuits, and other discrete loads.
- Useful for maintenance and replacement of compatible Infi 90 output termination arrangements.
Technical FAQs
What is the difference between the NTDO02 and an Infi 90 digital output module?
The NTDO02 is a field termination unit, while the digital output module performs the active I/O function. The controller and I/O module determine the output state, and the NTDO02 provides the physical interface to the field wiring.
What types of equipment can receive signals through the NTDO02?
It can form part of digital output circuits connected to compatible equipment such as relays, solenoids, valve interfaces, alarms, interlocks, and motor-control circuits. The complete field circuit must be checked for compatibility.
How can an NTDO02 wiring problem appear during commissioning?
A controller may show the expected output state while the external device fails to respond. In that situation, the termination point, field wiring, intermediate relay or interface, and field device should be checked in sequence.
What should be verified after replacing an NTDO02?
Confirm the terminal assignments, channel mapping, connection to the Infi 90 output electronics, and field wiring. Each affected output should then be tested from the controller command through to the actual field-device response.