ABB NDSI02 | Industrial DCS 16-Channel Digital Input Interface
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.
NDSI02: Product OverviewThe 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.
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 ValueThe 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
Typical ApplicationsThe 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.
We've got you covered
We give you access to a global supply of automation parts at your fingertips, ensuring that manufacturers around the world can avoid unnecessary downtime and continue to do what they do best – making our world possible.
Full 12-month warranty on all components
Dedicated after-sales support
Same-day dispatch on 1000s of parts
All units are fully tested
Continue Searching
We're here when you need us
What happens next?
1. Email confirmation
You will get an email confirming that we have received your enquiry.
2. Dedicated Account Manager
One of our team will be in touch to confirm your part(s) specification and condition.
3. Your quote
You will receive a comprehensive quote tailored to your specific needs.
Full 12-month warranty
Available for dispatch immediately
We deliver worldwide
Full 12-month warranty on all components
Full 12-month warranty on all components
