Description
Product Description
The ABB DSAB-01C is a specialized digital input/output module from the ABB Bailey INFI 90 distributed control system (DCS) and Network 90 product families. This module serves as a critical interface between the controller’s functional code and field devices, providing a group of discrete (on/off) input and output channels. The DSAB-01C is designed for high-density signal conditioning and isolation within the INFI 90’s modular architecture, ensuring reliable reading of sensor states and control of actuators in process environments. Integrating the ABB DSAB-01C into a Network 90 or INFI 90 I/O shelf expands the system’s capacity to handle discrete logic and interlocking functions.
Product Parameters
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Manufacturer / Brand: ABB (formerly Bailey Controls)
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Product Type: Digital Input/Output Module (for INFI 90 / Network 90)
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Model: DSAB-01C
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System Compatibility: ABB Bailey INFI 90 and Network 90 DCS.
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Module Type: A “Dual Slot Module” (DSM) designed for installation in a Network 90 or INFI 90 I/O module mounting unit.
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Channel Configuration: Typically provides a mixed group of digital input (DI) and digital output (DO) points (e.g., 8 DI and 8 DO) in a single module.
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Input Type: Sinking or sourcing, 24V DC or 48V DC, with optical isolation for noise immunity.
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Output Type: Typically solid-state relay (SSR) outputs rated for 24V DC or 120V AC switching at a specified current per channel.
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Isolation: Channels are grouped and isolated for safety and to prevent ground loop issues.
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Status Indicators: LED per channel for state indication (On/Off) and module health status.
Advantages and Features
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High-Density I/O: The ABB DSAB-01C consolidates multiple discrete I/O points into a single, compact module, optimizing space within the I/O cabinet and reducing wiring complexity.
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Excellent Signal Integrity: Features high-grade optical isolation on inputs and outputs, protecting the sensitive control system from transients, noise, and voltage spikes originating in the field.
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Proven Reliability in Harsh Environments: Designed to the rigorous standards of process DCS hardware, it offers stable, long-term performance in demanding conditions like those found in power plants and refineries.
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Clear Diagnostic Feedback: Per-channel LEDs provide instant visual confirmation of signal status, which is invaluable for electricians and technicians during commissioning and troubleshooting.
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Legacy System Longevity: As a genuine ABB spare part, the DSAB-01C is essential for maintaining and extending the operational life of the vast installed base of INFI 90 systems, which continue to run critical processes worldwide.
Application Cases in Application Fields
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Fossil Fuel Power Generation: In a coal-fired power plant’s burner management system, multiple ABB DSAB-01C modules read flame scanner statuses (inputs) and control igniter valves and damper actuators (outputs) to ensure safe boiler operation.
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Chemical Processing: Used on a reactor skid to monitor high-level switches, pressure relief valve positions (DI), and to command solenoid valves for emergency nitrogen purges or cooling water injection (DO).
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Pulp and Paper Mills: Controls the discrete sequence of a paper machine’s broke system, reading jam detection switches and controlling diverter gates to route paper stock to the correct tank.
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Water Treatment: Monitors the open/closed status of motor-operated valves (MOVs) via limit switch feedback and provides start/stop commands for chemical feed pumps.
Comparisons with Competing Products
For the specific INFI 90 ecosystem, the ABB DSAB-01C is compared against other I/O modules within the same system and against modern alternatives:
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Within the INFI 90 System: It must be selected over other DSM modules (like analog or communication modules) based on the required signal type. Its value is its specific mixed digital I/O functionality.
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Third-Party or Refurbished Modules: While third-party repaired modules exist, the genuine ABB DSAB-01C guarantees original component quality, proper calibration, and full compatibility with the system’s power supply and communication bus. Non-OEM parts risk introducing signal drift or communication errors.
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Modern DCS/PLC I/O: Compared to contemporary Ethernet-based I/O modules, the DSAB-01C operates on a slower, proprietary bus. Its advantage is not modern features, but its role as a reliable, known-quantity spare part that keeps a mature, fully-depreciated, and still-functional control system running without a multi-million dollar upgrade.
Selection Suggestions and Precautions
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Verify Exact System Compatibility: Confirm the module is for the INFI 90 or Network 90 system. Check the mounting unit type and ensure the module’s firmware/hardware revision is compatible with the rest of the control loop.
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Review Channel Specifications: Carefully match the DSAB-01C‘s input voltage (e.g., 24VDC vs. 48VDC) and output type/rating (DC vs. AC, current rating) with your field devices. Using an incorrect rating can damage the module or the field device.
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Address and Configuration: The module’s physical slot position in the mounting unit determines its I/O address in the control logic. Document this mapping carefully. Configuration is done within the INFI 90 engineering tools.
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Wiring and Fusing: Adhere strictly to the module’s wiring diagram. Provide external fusing on output channels as specified in the manual to protect the solid-state outputs from short-circuit damage.
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