ABB Bailey SPDSI22 DI Module

Product Overview

The ABB Bailey SPDSI22 is a high-density digital input (DI) module designed for use with ABB’s Symphony and INFI 90 Distributed Control Systems (DCS). Supporting 64 discrete input channels, the SPDSI22 is purpose-built to monitor field digital signals such as push buttons, proximity sensors, interlock switches, and relay contacts. Its compact form factor, paired with robust noise immunity and electrical isolation, makes it ideal for critical control and monitoring applications in industrial automation.

The SPDSI22 excels in environments requiring a high channel count with minimal physical footprint. Each channel features optical isolation for safe, reliable signal acquisition, and the module is engineered for use in harsh operating conditions.

Key Features

• 64 optically isolated digital input channels

• Supports 24 V DC clean contact inputs

• Designed for high-density I/O applications

• Fast input response with excellent noise rejection

• Full compatibility with ABB Symphony and INFI 90 systems

• Diagnostic and status indicators per channel

• Modular rack-mount design for easy installation

• Built-in surge protection and optical isolation

• Suited for high-availability and redundant systems

Technical Specifications

Industry Applications

The SPDSI22 is ideal for high-volume digital signal monitoring in a variety of critical automation environments:

• Oil & Gas – Monitoring valve positions, limit switches, interlocks, and safety devices.

• Power Generation – Tracks contact closures, alarms, and breaker statuses in fossil, hydro, and nuclear facilities.

• Water & Wastewater – Supervises pump status, tank levels, and control signals.

• Manufacturing – Supports automation line safety interlocks and position sensors.

• Chemical & Petrochemical – Gathers process signal states from distributed control areas.

• Metals & Mining – Collects remote input data in rugged and vibration-prone environments.

Product Advantages

• Ultra-High Density – 64 channels per module reduce system size and wiring complexity.

• Signal Integrity – Optical isolation ensures safe and clean signal transmission.

• Diagnostic Efficiency – Channel-level LED feedback and built-in self-monitoring simplify troubleshooting.

• Long-Term Reliability – Built for 24/7 operation in tough environmental conditions.

• Seamless Integration – Native compatibility with ABB Symphony and INFI 90 DCS systems.

• Fast Deployment – Modular plug-in format accelerates installation and commissioning.

Frequently Asked Questions (FAQ)

1. Q: How many digital inputs does the SPDSI22 support?
   A: It supports 64 digital input channels.

2. Q: What input voltage does it accept?
   A: It is designed for standard 24 V DC dry contact signals.

3. Q: Are the input channels isolated?
   A: Yes, each channel is optically isolated to prevent interference and ground loops.

4. Q: Is the SPDSI22 hot-swappable?
   A: Yes, when used in redundant configurations.

5. Q: What systems can it be used with?
   A: It is fully compatible with ABB Symphony and INFI 90 DCS systems.

6. Q: What is the input response time?
   A: The response time is typically less than 5 milliseconds.

7. Q: Are there status indicators on the module?
   A: Yes, each channel has an LED indicator for real-time status feedback.

8. Q: What kind of diagnostics are available?
   A: Built-in diagnostics include channel health monitoring and fault detection.

9. Q: What’s the operating temperature range?
   A: From 0°C to +60°C.

10. Q: How heavy is the SPDSI22 module?
    A: It weighs approximately 0.5 kg.

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Frequently Asked Questions (FAQ)

1. Q: How many digital inputs does the SPDSI22 support?
   A: It supports 64 digital input channels.

2. Q: What input voltage does it accept?
   A: It is designed for standard 24 V DC dry contact signals.

3. Q: Are the input channels isolated?
   A: Yes, each channel is optically isolated to prevent interference and ground loops.

4. Q: Is the SPDSI22 hot-swappable?
   A: Yes, when used in redundant configurations.

5. Q: What systems can it be used with?
   A: It is fully compatible with ABB Symphony and INFI 90 DCS systems.

6. Q: What is the input response time?
   A: The response time is typically less than 5 milliseconds.

7. Q: Are there status indicators on the module?
   A: Yes, each channel has an LED indicator for real-time status feedback.

8. Q: What kind of diagnostics are available?
   A: Built-in diagnostics include channel health monitoring and fault detection.

9. Q: What’s the operating temperature range?
   A: From 0°C to +60°C.

10. Q: How heavy is the SPDSI22 module?
    A: It weighs approximately 0.5 kg.

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Popular ABB Bailey Models

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