Digital I/O Termination Unit | NTRO02-A | ABB

Technical Specifications

The NTRO02-A is a digital I/O termination unit and relay output board for use in the Bailey Infi 90 and Symphony Harmony distributed control systems. It provides the signal interface between system-level processors and field devices, including circuit breakers and sensors, for digital control and monitoring functions.

Functional Operation

The ABB NTRO02-A is a Digital Input/Output (I/O) Termination Unit and Relay Output Board for use in ABB Bailey INFI 90 distributed control systems (DCS). It provides the termination interface between field digital devices and the control system, allowing digital input and output signals to be connected through a standardized wiring arrangement. The unit supports reliable signal transmission between field instruments and the associated control modules, enabling the exchange of digital status information and control commands within the INFI 90 system.

The NTRO02-A is intended to simplify field wiring and provide a dependable interface for external devices while maintaining signal continuity throughout the control system. Used as part of the INFI 90 I/O architecture, the unit supports process monitoring and control applications by providing a stable connection between field equipment and the distributed control system.

The difference between NTRO02-A and NTDO02-A

The NTRO02-A is a digital I/O termination unit and relay output board for the Bailey INFI 90 distributed control system. The unit terminates digital input and output signals between field devices and the control system. It interfaces directly with field instruments and I/O modules, maintaining signal integrity and simplifying wiring connections. The NTRO02-A is used for digital process monitoring and control applications.

The NTDO02-A is a Digital Output Termination Unit in the ABB INFI 90/Bailey control system. For wiring and signal transmission between digital output modules and field actuators, belonging to the field I/O layer. The NTDO02 Digital Output Termination Unit can provide up to eight solid state relay outputs. The configuration contained in a control module determines the output state of the digital output termination unit (TDO) relays. The NTDO02 termination unit is a functional replacement for the NTDO01 termination unit. The TDO termination unit interfaces with an I/O module through a cable connection. It can interface with an IMDSO04 Digital Output Module (DSO) or an IMDSM05 Digital I/O Module.

Technical FAQ

Q:What is the primary function of the ABB NTRO02-A?
A:The module operates primarily as a digital I/O termination unit and relay output board. It functions as a communication interface or bridge that routes control signals and handles data acquisition between an ABB INFI 90 OPEN multifunction processor and low-voltage field hardware like circuit breakers, actuators, or external relays.

Q:Which automation platforms are compatible with this module?
A:It is engineered explicitly for ABB Bailey INFI 90 control systems, but it is also backward compatible or integrated within updated Symphony Plus architectures utilizing standard Bailey termination styling.

Q:What type of electrical protection does it include?
A:It features optical isolation across channels rated at 2500 VDC. This protects fragile core control electronics from high-voltage transients or ground loops generated out in the industrial field environment.

Q: Do you supply brand-new, original parts or second-hand refurbished items?

A: Our stock consists of Original New items; all products undergo quality inspection to ensure they are fully functional.

Q: What guarantees are included with the shipment?
A: All items in stock are tested by engineers, packed in professional ESD packaging, and shipped via express logistics with a global delivery time of 24–48 hours.

Q: How long does global shipping take?
A: Stock items are typically dispatched within 24 hours. Shipments are sent via DHL or FedEx Express, taking approximately 3–5 days to reach Asia, 4–6 days to Europe and the Middle East, and usually arriving within a week in major industrial regions worldwide.

Q: If the model I need is not listed on the website, can I request a quote?
A: Yes. We hold over 200,000 SKUs of industrial spare parts in stock, and many long-tail models are not listed in full. You can send us an RFQ (Request for Quote) directly, and we will provide wholesale pricing promptly.

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