GE WESDAC D20ME Modules – GE-Harris 820-0468/00 Substation Controller

Technical Dossier

Product Details And Specifications

GE WESDAC D20ME Series Technical Notes

The Evolution of WESDAC D20ME Architecture

The WESDAC product family originated from Harris Corporation's Power Systems division, which was subsequently acquired by GE to form GE-Harris Energy Control Systems. The D20 platform was introduced as a modular, rack-based RTU/controller designed for substation environments requiring IEC 60870-5 and DNP3 protocol support. The D20ME (Modular Enhanced) variant represented a significant architectural revision over the original D20, introducing a 32-bit processor core, expanded memory addressing, and a redesigned backplane bus capable of supporting higher-density I/O configurations.

WESDAC D20ME Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced modules within the GE WESDAC D20ME ecosystem. Each entry reflects a discrete hardware component with a defined functional role within the D20ME rack architecture.

820-0468/00: D20ME substation controller main CPU module, DNP3/IEC 60870-5 host
820-0469/00: D20ME enhanced CPU module, expanded RAM, dual Ethernet ports
820-0470/00: D20ME digital input module, 32-channel, 24VDC wet contact
820-0471/00: D20ME digital output module, 16-channel relay, Form C contacts
820-0472/00: D20ME analog input module, 8-channel, 4–20mA / 0–10V selectable
820-0473/00: D20ME analog output module, 4-channel, 4–20mA isolated
820-0474/00: D20ME communications adapter, RS-232/RS-485 dual-port serial
820-0475/00: D20ME Ethernet communications module, 10/100Base-T, IEC 61850 MMS
820-0476/00: D20ME power supply module, 24VDC input, rack-mount, redundant-capable
820-0477/00: D20ME power supply module, 125VDC input, substation-grade
820-0478/00: D20ME digital input module, 64-channel, high-density, optically isolated
820-0479/00: D20ME SOE (Sequence of Events) recorder module, 1ms resolution
820-0480/00: D20ME DNP3 concentrator module, multi-drop master/slave
820-0481/00: D20ME IEC 61850 GOOSE publisher/subscriber module
820-0482/00: D20ME backplane bus extender, for multi-rack configurations
820-0483/00: D20ME GPS time synchronization module, IRIG-B input
820-0484/00: D20ME redundant CPU switchover module, hot-standby architecture

Quality Control for the WESDAC D20ME Range

The D20ME platform's backplane bus architecture and inter-module communication protocols require functional validation beyond standard power-on testing. DriveKNMS applies a structured test protocol to all D20ME modules prior to dispatch:

CPU modules (820-0468/00 and variants) are bench-tested using a reference D20ME rack loaded with known-good I/O modules. Boot sequence, firmware version verification, DNP3 master/slave communication, and Ethernet port integrity are validated against GE-Harris technical specifications. Digital I/O modules are tested for channel-by-channel continuity, isolation resistance between channels, and correct state reporting via the backplane bus. Analog modules are calibrated against traceable reference standards and verified across the full input/output range. Communications modules are tested for protocol conformance using DNP3 and IEC 61850 test tools. Power supply modules are load-tested at rated current and verified for output voltage stability and ripple within GE-Harris specifications. All modules are inspected for capacitor condition, connector integrity, and PCB contamination before packaging.