GE WESDAC D20 C

Product Overview

The GE WESDAC D20 C is a modular analog and digital I/O interface module developed as part of the WESDAC D20 series for industrial control and substation automation applications. It combines both analog and digital signal handling in one unit, simplifying system design and field wiring while enabling efficient real‑time data acquisition and control actions within the GE D20 control architecture.

Originally part of GE’s industrial automation portfolio, this unit is widely used in legacy SCADA environments and continues to support reliable integration with automation and protection systems.

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Key Features

• Modular I/O Capacity: Supports digital and analog inputs and control outputs through flexible configurations.

• Combined I/O Functionality: Integrates field wiring termination (WESTERM D20 C) with data processing (WESDAC D20 C).

• Detachable Components: Two‑part design eases installation and maintenance.

• Multiple Channel Options: Typical configurations include 16 digital inputs and 8 control outputs, with optional analog I/O daughter cards.

• Dual Communication Ports: DB9 connectors enable daisy‑chain linking and maintenance communications.

• Local/Remote Control: Integrated switch for managing relay coil power and module status indications.

• Compatible with GE D20 Processor: Works seamlessly with the D20 main controller and other peripheral modules in the system.

  
  

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Structural Description

The module consists of two main physical parts:

• WESTERM D20 C: Lower termination board handling all field wiring connections and providing structured input/output termination.

• WESDAC D20 C: Upper processing module that executes signal conditioning, I/O scanning, and communication to the D20 controller over the D.20 Link interface.

These parts can be assembled and disassembled independently, making system commissioning and module replacement easier without disturbing the entire panel wiring.

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Functional Capabilities

Depending on configuration, the WESDAC D20 C supports:

• Digital Inputs: Up to 16 channels for status monitoring.

• Control Outputs: Typically 8 relay outputs for control and switching actions.

• Analog Inputs: Optional daughter boards for up to 16 analog channels.

• Analog I/O Combinations: Optional support for mixed analog I/O (e.g., 8 inputs + 8 outputs).

Additional options allow customization of input ranges and output formats based on application requirements.

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Typical Applications

The GE WESDAC D20 C module is well suited for:

• Substation Automation: Distributed I/O tasks and sensor interfacing.

• Industrial SCADA Projects: Data acquisition and discrete/analog control within process industries.

• Utility Distribution Control: Monitoring breaker status, control outputs, and analog measurements.

• Manufacturing Automation: Programmable logic interfacing to drive control and sensor feedback loops.

  
  

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Installation & Maintenance

Installation normally involves mounting the WESTERM termination board and connecting all field wiring according to system diagrams. The WESDAC module then connects to this termination base and communicates with the D20 controller via a D.20 Link interface. Two DB9 ports facilitate daisy‑chain connections for expanded systems and support maintenance communications via a dedicated maintenance port.

Maintenance mostly includes routine inspection of connectors, verification of signal integrity, and ensuring that any optional analog I/O boards are correctly installed and configured. The detachable nature of the modules makes replacement and troubleshooting simpler without disturbing the entire installation.

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Advantages

• Flexible I/O Configuration: Supports both digital and analog signals in a single modular solution.

• Easy Field Wiring: Termination module simplifies cable organization and reduces panel clutter.

• Legacy System Compatibility: Designed to interface with established GE D20 control architectures.

• Industry Longevity: Proven technology with continued use in industrial and utility environments.

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Summary

The GE WESDAC D20 C is a versatile, modular I/O interface module providing combined digital and analog signal processing for industrial control and substation automation systems. Its detachable construction, flexible configuration options, and integration with the GE D20 series make it a reliable choice for engineers handling distributed I/O tasks within complex automation networks.