WESDAC D20C Module | GE D20 Substation Automation I/O Board

GE WESDAC D20C Analog Digital I/O Module – Product Description

Overview

The GE WESDAC D20C is a high-performance combination I/O module designed for substation automation and distributed control systems. It consists of two detachable components: the WESTERM D20C termination board for field wiring and the WESDAC D20C processing board for signal acquisition and communication. Moreover, its modular design supports both digital and analog signals while reducing main controller load, enhancing efficiency in industrial automation applications.

Technical Specifications

Digital I/O:

• 16 digital inputs for status indication

• 8 control outputs (momentary or dual-function trip/close)

Analog I/O (Optional Configurations):

• 16 analog inputs (voltage, current, transducer signals)

• Or 8 analog inputs + 8 analog outputs combination

Processing & Architecture:

• 8-bit Freescale 68HC11 MPU with 2 MHz clock speed

• Distributed I/O architecture reduces main controller load

• Optional daughter boards for analog expansion

Communication:

• Dual D.20 Link ports for daisy-chaining or redundancy

• Supports Modbus TCP/IP, SRTP, DNP3 protocols

Diagnostics & Maintenance:

• Hot-swappable modules for easy testing and commissioning

• Built-in surge protection and noise filtering

Environmental Ratings:

• Operating temperature: –30 °C to +65 °C

• Protection level: IP65, resistant to humidity, vibration, and EMI

Physical Specifications:

• Modular design with detachable termination and processing boards

• Compact enclosure reduces panel space

• Weight: 1.542 kg

FAQ

Q1: Can the WESDAC D20C be serviced without disconnecting field wiring?
Yes, its hot-swappable design allows maintenance without disturbing terminations.

Q2: What types of signals does the module support?
It handles digital inputs/outputs and analog inputs/outputs, depending on configuration.

Q3: Is it suitable for harsh environments?
Yes, it has IP65 protection and operates from –30 °C to +65 °C.

Q4: Can multiple modules communicate in a network?
Yes, dual D.20 Link ports enable daisy-chaining or redundant system setups.

Q5: How does it improve main controller efficiency?
The local processing board offloads I/O handling and basic logic functions from the main controller.