Technical Specifications

Parameter Name	Parameter Value
Product Model	NTRO02-A
Manufacturer	ABB
Product Type	Termination Unit / I/O Interface Board
System Compatibility	ABB Bailey Infi 90, Symphony Plus, Harmony DCS, Advant
Channel Configuration	2-channel analog I/O or 16/32-channel digital I/O (configurable)
Input Signal Types	0-10V, 2-10V, 4-20mA, 0-20mA (analog variants)
Input Voltage Range	24V DC / 125V DC (depending on configuration)
Accuracy	±0.1% FS
Resolution	12-16 bit (variant-dependent)
Electrical Isolation	Galvanic isolation via connected I/O module; channel-to-system isolation provided
Operating Temperature	-25°C to +70°C
Storage Temperature	-40°C to +85°C
Dimensions	127 × 96 × 25 mm (analog variant) or 22.6 × 14.1 × 1 cm (digital variant)
Weight	0.2-0.25 kg (analog variant) / 0.12 kg (digital variant)
Mounting	DIN rail mounting or rack-mount on Harmony mounting base
Connector Type	Screw-clamp terminals (front) / High-density board-to-board (rear)
Protection Class	IP20
Country of Origin	Sweden
Certifications	CE, UL, RoHS

 

Main Features and Advantages

Reliable Field Wiring Interface: The ABB NTRO02-A provides a secure and organized connection point for field devices, significantly simplifying control cabinet wiring and reducing the potential for installation errors. Its high-quality screw-clamp terminals ensure low contact resistance and strong mechanical retention, preventing signal loss or intermittent faults caused by vibration or thermal cycling. The clearly numbered and labeled terminal blocks on the ABB NTRO02-A facilitate rapid identification of signal routes, streamlining both initial installation and ongoing maintenance activities. This design feature makes the ABB NTRO02-A an essential component for high-density I/O applications where wiring clarity is paramount.

Seamless System Integration: The ABB NTRO02-A is specifically engineered for native compatibility with ABB Bailey Infi 90, Symphony Plus, and Harmony DCS platforms, ensuring plug-and-play integration with corresponding I/O modules such as analog input cards, digital input/output modules, and processing units. The rear-mounted board-to-board connector of the ABB NTRO02-A provides a precise mechanical and electrical interface with the companion function module, eliminating the need for complex intermediate cabling and reducing the risk of connection errors. This integrated design of the ABB NTRO02-A minimizes signal path lengths, reducing susceptibility to electromagnetic interference and preserving signal fidelity.

Versatile Signal Support: The ABB NTRO02-A is available in configurations supporting a wide range of signal types, making it adaptable to diverse application requirements. Analog variants of the ABB NTRO02-A accept standard industrial signals including 0-10V, 2-10V, 4-20mA, and 0-20mA, with high accuracy of ±0.1% and resolution up to 16 bits. Digital variants of the ABB NTRO02-A support 16 to 32 discrete channels for connecting limit switches, pressure switches, solenoid valves, and motor starters. This flexibility allows the ABB NTRO02-A to serve as a universal termination solution across multiple process areas, simplifying spare parts management and technician training.

Robust Industrial Construction: Built to withstand the rigors of industrial environments, the ABB NTRO02-A features a flame-retardant glass-fiber PCB, corrosion-resistant alloy terminals with plating for oxidation protection, and a compact form factor suitable for space-constrained cabinets. The ABB NTRO02-A operates reliably across a wide temperature range of -25°C to +70°C and maintains stable performance in humid conditions up to 95% non-condensing. Its IP20 protection rating ensures safe indoor operation in control rooms and electrical cabinets, and the ABB NTRO02-A meets stringent international standards including UL and CE certifications.

 

Application Fields

Distributed Control Systems (DCS): The ABB NTRO02-A is predominantly deployed within ABB Bailey Infi 90 and Symphony Harmony DCS racks, where it functions as the primary field wiring interface for critical process measurements and control outputs. In these systems, the ABB NTRO02-A terminates signals from pressure transmitters, temperature sensors, flow meters, and level switches, routing them to the appropriate analog or digital input modules for processing. The ABB NTRO02-A also connects control output signals to final control elements such as control valves, motor starters, and solenoid-operated devices, closing the control loop for continuous process management.

Power Generation and Utilities: The ABB NTRO02-A plays a vital role in power generation applications, including boiler control systems, turbine supervisory systems, and balance-of-plant monitoring. In thermal and nuclear power plants, the ABB NTRO02-A interfaces with sensors monitoring steam pressure, fuel flow, water chemistry, and generator output, ensuring that critical safety and operational parameters are reliably transmitted to the DCS. The robust construction of the ABB NTRO02-A ensures dependable performance in these high-availability applications where system reliability directly impacts plant safety and production continuity.

Oil, Gas, and Chemical Processing: In refineries, petrochemical plants, and natural gas processing facilities, the ABB NTRO02-A serves as the interface between field-mounted instrumentation and the DCS. The ABB NTRO02-A supports signals from safety instrumented systems, emergency shutdown systems, and fire and gas detection networks, providing the connectivity foundation for process safety and asset protection. The ABB NTRO02-A also facilitates monitoring and control in compressor stations, pipeline control systems, and chemical reactor control applications, where reliable signal transmission is essential for maintaining process integrity.