ABB NDSI02
ABB NDSI02
ABB NDSI02
ABB NDSI02

ABB NDSI02 | Industrial DCS 16-Channel Digital Input Interface

  • Brand: ABB
  • Model: NDSI02
  • Product Type: Digital Input Slave Module
  • Series: Symphony Harmony (Symphony Plus)
  • Core Function: Receives 16-channel digital signals (dry contact/solid-state) from field devices, converts to standardized format, and transmits to Symphony Harmony DCS master controllers via Profibus DP.
  • Key Specs: 16 isolated channels, 24V DC input (18-30V DC range), 2500VAC isolation, Profibus DP (up to 12 Mbps), -25°C to +60°C operating temperature.
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Part number: ABB NDSI02
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Description

NDSI02: Product Overview
The ABB NDSI02 is a 16-channel digital input slave module designed for integration into ABB Symphony Harmony distributed control system (DCS) architectures. Positioned as a field-to-controller interface, its primary role is to acquire discrete signals from industrial devices—such as proximity switches, limit switches, pushbuttons, and valve position indicators—and transmit this data to Symphony Harmony master controllers (e.g., AC800M) for logic processing. This module is critical for maintaining accurate representation of plant states in continuous process control, where reliable discrete signal acquisition directly impacts safety and operational efficiency.
Functionally, the NDSI02 processes inputs from 16 independently isolated channels, each configurable for 24V DC dry contact (relay) or solid-state (transistor) signals. It employs galvanic isolation (2500VAC) to mitigate ground loop interference and electromagnetic noise, ensuring signal integrity in electrically harsh environments. The module communicates with the DCS master via Profibus DP (up to 12 Mbps), supporting both cyclic data exchange (for real-time control) and acyclic messages (for diagnostics). As part of the Symphony Harmony family, it leverages the platform’s modular design, hot-swappable components, and compatibility with ABB’s Control Builder M engineering tool. Benefits include simplified system expansion, reduced wiring complexity, and unified configuration workflows across I/O racks.

ABB NDSI02

ABB NDSI02

NDSI02: Technical Specifications
  • Model Number: NDSI02
  • Manufacturer: ABB
  • Product Type: Digital Input Slave Module
  • Number of Channels: 16 (individually isolated)
  • Input Type: Dry contact (relay), Solid-state (transistor)
  • Input Voltage: 24V DC nominal (18-30V DC range)
  • Isolation Voltage: 2500VAC (channel-to-channel, channel-to-bus)
  • Signal Response Time: <5 ms (input change to master update)
  • Communication Protocol: Profibus DP (up to 12 Mbps)
  • Operating Temperature: -25°C to +60°C
  • Humidity Range: 5% to 95% non-condensing
  • Power Supply: 24V DC (from rack backplane, 18-32V DC range)
  • Power Consumption: 1.5W (typical, all channels active)
  • Dimensions: 25mm x 128mm x 115mm (width x height x depth)
  • Weight: 0.2kg
  • Certifications: CE, UL, cULus, RoHS
Core Features & Customer Value​
The NDSI02’s design prioritizes reliability and ease of integration for industrial automation engineers. Its 16-channel density reduces cabinet footprint compared to lower-density modules, minimizing wiring complexity and material costs in systems with numerous discrete devices (e.g., assembly lines with multiple sensors). For a water treatment plant, this means fewer modules to mount and wire, streamlining initial installation.
Galvanic isolation (2500VAC) is critical for signal integrity. In chemical plants with high-power agitators or VFDs, EMI can corrupt digital signals, leading to false trip commands. The NDSI02’s isolation prevents this, ensuring limit switch activations or emergency stop signals are transmitted accurately—vital for preventing over-pressurization or equipment damage.
Built-in diagnostics enhance maintenance efficiency. The module monitors channel faults (short/open circuit), power supply health, and communication status, reporting issues to the DCS master via LED indicators and software logs. For maintenance teams, this reduces troubleshooting time from hours to minutes; a failed proximity switch in an automotive assembly line can be identified without invasive testing.
Hot-swap capability allows replacement without system shutdown, critical for continuous processes like oil refining. Technicians remove the faulty module and install a new one; the DCS automatically reloads configuration data, eliminating scheduled downtime. Integration with Control Builder M enables engineers to reuse I/O profiles across projects, cutting commissioning time by 20%.

ABB NDSI02

ABB NDSI02

Typical Applications​
The ABB NDSI02 is deployed in Symphony Harmony DCS environments requiring discrete signal acquisition. In a petroleum refinery’s crude distillation unit, it connects 16 temperature switch inputs (dry contact) to the DCS master, monitoring column tray temperatures. Profibus DP ensures real-time data transmission for control valve adjustments, while 2500VAC isolation withstands EMI from nearby pumps.
At a chemical plant’s polymerization reactor, the module acquires 8 agitator overload switch signals (dry contact) and 8 valve position feedback signals (solid-state). Its -25°C cold-start capability supports winter startups, and hot-swap functionality allows maintenance during planned turnarounds without halting production.
In a municipal wastewater treatment plant, the NDSI02 interfaces with 12 pump status switches (dry contact) and 4 level indicator contacts (solid-state) across lift stations. Data is transmitted via Profibus DP to the central SCADA system, enabling remote monitoring of pump health and tank levels. The module’s compact size (25x128x115mm) fits into space-constrained I/O racks, simplifying retrofits in aging facilities.

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