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Product Introduction
The ABB Bailey NDSI01 6635905A1 Digital Slave Input Module is a high-performance discrete input module engineered for use within the INFI 90 Distributed Control System (DCS). Designed for precise acquisition of digital signals from the field, this module reads the status of various discrete sensors and switchgear components and communicates their condition to the controller in real-time.
With 16 isolated digital input channels, the NDSI01 is capable of monitoring contacts such as limit switches, push buttons, interlocks, relays, and auxiliary feedback points. It supports fail-safe operations and ensures reliability in the face of voltage spikes and industrial electrical noise, making it a dependable part of control infrastructures in process industries.
This module is widely used in industrial plants for signal collection in mission-critical applications, such as emergency stop systems, valve limit detection, and motor starter feedback. Built with rugged construction and diagnostic capabilities, the NDSI01 is a cornerstone in Bailey’s proven control solutions portfolio.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | NDSI01 Digital Slave Input Module |
| ABB Part Number | 6635905A1 |
| Input Type | Digital (Discrete) |
| Number of Channels | 16 |
| Input Voltage Range | 24V DC nominal (typical range: 18–30V DC) |
| Input Signal Type | Dry contact or voltage level sensing |
| Input Isolation | Channel-to-channel and channel-to-bus |
| Input Current | Approx. 6 mA per channel |
| Status Indicators | One LED per channel (on/off state) |
| Diagnostic Features | Input status monitoring, fault detection |
| Mounting Type | Rack-mounted in standard INFI 90 chassis |
| Communication Interface | Slave Bus Interface |
| Hot Swap Capability | Not hot-swappable; requires system shutdown for replacement |
| Power Consumption | Approx. 4.2 W |
| Operating Temperature | 0°C to +60°C (32°F to +140°F) |
| Storage Temperature | -40°C to +85°C (-40°F to +185°F) |
| Humidity Range | 5% to 95% non-condensing |
| Dimensions (W x H x D) | 26 x 292 x 188 mm |
| Weight | 0.23 kg |
| Certifications | CE, UL, CSA, RoHS compliant |
| Compatible Systems | ABB INFI 90 DCS, Harmony system |
Product Applications
The NDSI01 module is suitable for a wide range of industrial applications where accurate monitoring of binary input conditions is essential. Its use spans various sectors including:
-
Power Generation
Tracks circuit breaker status, auxiliary relay contacts, and turbine protection inputs. -
Oil & Gas Industry
Monitors emergency shutdown pushbuttons, wellhead equipment signals, and flow switch statuses. -
Chemical & Petrochemical Plants
Used for limit switch monitoring, tank overflow switches, and critical interlock signal acquisition. -
Metals and Mining
Detects conveyor belt sensors, proximity switches, and safety interlocks. -
Water & Wastewater Treatment
Monitors pump feedback, valve position sensors, and level indicators. -
Pulp & Paper Industry
Inputs from feeder interlocks, emergency pull cords, and stop switches are collected through NDSI01.
Product Advantages
-
Reliable Signal Acquisition
Delivers accurate digital signal monitoring for critical applications under industrial stress conditions. -
High-Density Input
Features 16 input channels per module, optimizing rack space and reducing system complexity. -
LED Indicators
Channel-specific LEDs provide clear diagnostics and signal presence confirmation. -
Noise Immunity
Designed with electrical isolation and surge protection to function reliably in harsh EMI conditions. -
Flexible Input Support
Compatible with both dry contacts and logic voltage levels. -
Industrial-Grade Durability
Built to operate under extreme environmental conditions with extended temperature and humidity tolerance. -
Seamless DCS Integration
Fully compatible with ABB Bailey INFI 90 systems, ensuring no compatibility or software adaptation issues. -
Extended Life Cycle
Backed by ABB’s support for legacy systems, ideal for facilities with long system life expectations. -
Easy Maintenance
LEDs and diagnostic tools assist in quick fault isolation and system health checks. -
Proven Performance
Trusted by thousands of industrial sites globally in 24/7 operation.
Frequently Asked Questions (FAQ)
-
What is the main function of the NDSI01 module?
It collects digital signals (on/off) from field devices and transmits them to the control system. -
How many channels are available in NDSI01?
The module supports 16 isolated digital input channels. -
Can the module detect both dry contact and voltage input?
Yes, it is designed to support both contact closures and DC voltage-level inputs. -
Is this module compatible with non-ABB systems?
No, it is specifically designed for the ABB Bailey INFI 90 control system. -
Does it support hot-swapping?
No, the module is not hot-swappable and should be replaced only after system power-down. -
Are the input channels isolated from each other?
Yes, each input channel is isolated to prevent signal interference or damage. -
What kind of field devices can be monitored with NDSI01?
Devices such as limit switches, pushbuttons, relay contacts, and sensors can be monitored. -
How do I confirm if a channel is receiving a signal?
Each channel has a status LED that lights up when an input signal is detected. -
What is the typical operating temperature range?
The module operates reliably between 0°C to 60°C (32°F to 140°F). -
What certifications does this module carry?
It complies with CE, UL, CSA, and RoHS standards.
Related Models – Same Series or Functionality
| Model | Description | Type | Compatibility |
|---|---|---|---|
| NDSO04 | Digital Slave Output Module | Digital Output | INFI 90 DCS |
| IMMFP12 | Multifunction Processor Module | Controller Module | INFI 90 DCS |
| INNIS21 | INFI-Net to INFI-Net Slave Module | Communication Module | INFI 90 DCS |
| INICT03A | INFI-Net to Computer Transfer Module | Interface Module | INFI 90 DCS |
| NTDI01 | Termination Unit for Digital Input Modules | Terminal Assembly | INFI 90 DCS |
| NDSI02 | Digital Slave Input Module (24V DC variation) | Digital Input | INFI 90 DCS |
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