Technical Specifications

Parameter Name	Parameter Value
Product Model	NTDO02
Manufacturer	ABB (Bailey Controls)
Product Type	Digital Output Termination Unit
Series Compatibility	INFI 90, Symphony, Net 90 DCS
Output Channels	8 (solid state relay outputs)
Compatibility	IMDSO04 Digital Output Module / IMDSM05 Digital I/O Module
Max Channel Output	24V DC, 1.2A (typical)
Overload Capacity	Up to 20A
Configuration	Dipshunts (XU01-XU10)
Input Voltage	24V DC
Operating Temperature	-20°C to +70°C
Protection	Fused outputs
Cable Connection	NKTU01/11 or NKDO01/11
Dimensions (W x H x D)	Various: 178 x 178 x 51 mm
Weight	Approx. 0.25 – 0.5 kg
Product Status	Active Spare / Support Phase

 

 

Main Features and Advantages

Configurable Dipshunt Design: The ABB NTDO02 employs a flexible dipshunt configuration system that allows precise mapping of DCS output channels to physical field terminals. The XU01 and XU02 dipshunts determine whether the outputs correspond to Group A or Group B from the connected DSO module, while dipshunts XU03 through XU10 are strapped to assign each of the eight channels to its specific output . This design enables the ABB NTDO02 to adapt to various control strategies without hardware modifications, although careful configuration is critical—removing unused output jumpers is essential to prevent unintended cross-talk or outputs not matching software commands .

Robust Interface with DCS Modules: The ABB NTDO02 forms a seamless interface with control system logic, translating digital signals from modules like the IMDSO14 into reliable, high-current outputs for field devices . It ensures that up to 16 digital output signals from a master I/O module can securely manage up to nine relays per channel, dramatically expanding the control capacity of a single DCS module . The ABB NTDO02 is also the direct upgrade path from the NTDO01, providing enhanced functionality while maintaining compatibility within the existing INFI 90 infrastructure .

Reliable Performance and Protection: Engineered for the rigorous demands of industrial environments, the ABB NTDO02 delivers consistent performance, supporting a 1.2A output per channel with a peak overload capacity of up to 20A . The inclusion of individual fuses (F1-F8) on the termination board protects the unit and the connected DCS module from field wiring faults or short circuits, preventing costly damage to backplane components . The ABB NTDO02 operates across a wide temperature range of -20°C to +70°C, ensuring stability in demanding environments .

Ease of Maintenance and Troubleshooting: The ABB NTDO02 simplifies system diagnostics with clearly labeled terminal blocks and dipshunt configuration sockets . The ability to independently power or test individual output groups makes maintenance straightforward, allowing technicians to isolate and resolve channel issues quickly, which minimizes downtime. The ABB NTDO02‘s robust and compact design ensures it remains a reliable link between the digital control logic and the power-consuming field devices.

 

Application Field

The ABB NTDO02 is a critical component within ABB Bailey INFI 90 and Net 90 distributed control systems (DCS), serving as the essential interface for deploying digital control commands to the field . Its primary function is to translate logic-level signals from the DCS into robust, high-current outputs capable of directly driving industrial actuators, relays, and motors.

Power Generation: The ABB NTDO02 is heavily utilized in fossil fuel, nuclear, and combined-cycle power plants. It is instrumental in controlling critical binary equipment such as motor-operated valves (MOVs) on feedwater and steam lines, solenoid-operated trip valves on turbines, and start/stop control for auxiliary pumps and fans . Its fused outputs and robust isolation are crucial for safe, reliable operation in power generation environments.

Oil, Gas, and Petrochemicals: In refineries and chemical processing plants, the ABB NTDO02 is deployed to manage control loops for emergency shutdown (ESD) systems, operate actuated on/off valves, and manage pump start/stop sequences. Its ability to interface with the DCS to provide high-integrity digital outputs is vital for maintaining both process safety and operational continuity . The ABB NTDO02 is often used in non-hazardous (safe) areas to control devices in more hazardous parts of a plant.

Heavy Industry and Manufacturing: The ABB NTDO02 finds application in metals processing, where it controls solenoid valves and contactors for heavy material handling equipment. In pulp and paper mills, the ABB NTDO02 manages the start-up and shut-down sequences of large motors and valve control on digesters, ensuring the rigorous demands of production are met.

Water and Wastewater Treatment: The ABB NTDO02 is utilized in municipal and industrial water treatment facilities to control large pumps, chemical metering pumps, and filter backwash sequences . The unit’s reliable output capability is critical for maintaining water quality and environmental compliance. As a common spare part in MRO inventories, the ABB NTDO02 provides plants with a reliable path to keep legacy systems operational while they plan for long-term migrations to newer platforms .