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GE WESTERMD20C I/O Module

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  • Part Number: WESTERMD20C
  • Brand: General Electric
  • Type: I/O Module
  • Dimensions: 4x18.5x12.7cm
  • Country of Origin: USA
  • Barcode: 8537101190

Additional Specifications

Color / Pattern
  • Black
  • Gray
Power Source
  • DC-powered
Communication Protocols
  • Ethernet
Controller Design
  • Modular
Tags: GE Energy D20 , I/O Modules

Product Description

Serves as the primary GE WESDAC D20C I/O Module utilized to execute digital and analog field signal processing across GE D20 RTU automation platforms.

Suffix Breakdown & Model Matrix

The D20C system consists of a two-part hardware architecture comprising a main processing module paired with a dedicated termination assembly:

  • WESDAC D20C: Main electronics module featuring the 68HC11 MPU, memory, and optional analog daughterboards for data processing and D.20 Link communication.
  • WESTERM D20C: Detachable terminal panel dedicated to physical field wiring termination and interposing relay interface routing.

Hardware Specifications

Parameter Specification
Model WESDAC D20C
Brand GE
Origin USA
Weight Approx. 1.20 kg
Dimensions Standard D20 Subrack Slot Card
Operating Temp -20 to +70 deg C
Power Consumption Subrack Backplane / D.20 Link Bus Powered
Processor 8-bit Freescale 68HC11 MPU @ 2 MHz
On-Board Memory 24 KB EPROM, 32 KB Static RAM, 512 bytes EEPROM
Digital Inputs 16 Channels
Control Outputs 8 Momentary or Dual-Function Relay Outputs
Optional Daughterboard 1 16 Analog Inputs (Bipolar, Differential, 14-bit plus sign resolution)
Optional Daughterboard 2 8 Analog Inputs and 8 Analog Outputs (Unipolar/Bipolar, 12-bit plus sign resolution)
Analog Input Conversion 275 ms (16 channels @ 60 Hz), 328 ms (16 channels @ 50 Hz)
Serial Interfaces 2x DB9 D.20 Link Daisy-Chain Ports, 1x DB9 WESMAINT D20 Maintenance Port

Backplane Bus & Deterministic Network Scaling

The WESDAC D20C employs dual DB9 serial interface connections to execute high-speed D.20 Link communications across distributed controller racks. Internal processing offloads loop scanning from the central D20 main processor using an on-board 68HC11 microcontroller running at 2 MHz clock speed. The module processes 16-channel analog updates within 275 ms (at 60 Hz filtering) and executes local I/O density scaling with 95 dB common-mode noise rejection, maintaining deterministic data delivery over internal bus topographies.

Frequently Asked Questions

Q: How is local maintenance performed on the WESDAC D20C without interrupting backplane serial traffic?

A: The card features a dedicated DB9 WESMAINT port on the front panel, allowing direct ASCII terminal access for diagnostics while maintaining active polling on the secondary D.20 Link daisy-chain ports.

Q: What is the purpose of the Local/Remote switch located on the front panel of the module?

A: The Local/Remote toggle switch isolates relay coil power output circuits during maintenance, preventing accidental field tripping while providing module status feedback to the host controller.

Field Installation Guidelines

  1. Mount the WESTERM D20C termination panel into the rear rack rails prior to inserting the WESDAC D20C active processing card.
  2. Verify all field signal wiring is de-energized before connecting wires to the terminal blocks.
  3. Ensure the DB9 serial daisy-chain cables for the D.20 Link are securely fastened using thumbscrews to prevent intermittent bus loss.
  4. Ground all analog input shield wires at one end only to the designated chassis ground stud on the WESTERM panel.
  5. Set the Local/Remote switch to "Local" during wiring installation to suppress control output activation.
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