Product Core Brief
- Model: D20 EME 27-APR-13
- Brand: GE / GE Energy (legacy D20/D200 substation controller family)
- Series: GE D20 / D200 RTU Expansion
- Core Function: Ethernet and memory expansion module for GE D20/D200 substation controllers, adding LAN connectivity and battery-backed SRAM for SCADA communication and event buffering.
- Product Type: Ethernet / Memory Expansion Module
- Key Specs: 10BASE-T / 10BASE-FL / 10BASE2 Ethernet | battery-backed SRAM | D20/D200 chassis compatible | Modbus / DNP3 / IEC protocol support | legacy substation design
- Condition: New Original / New Surplus
- Note: “27-APR-13” appears to be a manufacturing or revision date. The base product remains the D20 EME Ethernet/Memory Expansion module.
Key Technical Specifications
- Part Number: D20 EME 27-APR-13
- Product Family: GE D20 / D200 Substation Controller Expansion
- Function: Ethernet connectivity + memory expansion
- Ethernet Interfaces: 10BASE-T (RJ-45), 10BASE-FL (fiber), 10BASE2 (coax), depending on configuration
- Memory: Battery-backed SRAM, typically 0 MB / 8 MB / 16 MB options
- Serial Ports: Multiple RS-232/RS-485 serial ports plus maintenance port (varies by configuration)
- Protocol Support: Modbus, DNP3, IEC 60870-5-101/104, IEC 61850 (system-dependent)
- Chassis Compatibility: GE D20 and D200 RTU/substation controller chassis
- Power Supply: Varies by chassis configuration; commonly 20–60 VDC or 100–300 VDC / 85–264 VAC
- Operating Temperature: -20°C to +60°C (reference value)
- Protection: IP20, industrial EMC compliance
- Typical Applications: Substation automation, RTU communication upgrade, SCADA gateway expansion, event buffering, protocol conversion, and legacy D20/D200 system maintenance
Product Introduction (No Fluff)
The GE D20 EME 27-APR-13 is an Ethernet and memory expansion module for the GE D20/D200 substation controller and RTU platform. It adds LAN connectivity through 10BASE-T, 10BASE-FL, or 10BASE2 interfaces while expanding battery-backed SRAM capacity for event records, communication buffers, and automation logic.
This module is typically installed in a D20 or D200 chassis to enhance SCADA communication, protocol handling, and data buffering capability. It supports common utility protocols such as Modbus, DNP3, and IEC standards, making it suitable for substation automation, remote monitoring, and legacy GE Energy RTU upgrades. Because the D20/D200ME controller family is now legacy, the D20 EME is mainly used for spare parts, system maintenance, and migration support.
The “27-APR-13” marking most likely indicates a manufacturing or revision date and does not change the module’s base function as a D20 EME Ethernet/Memory Expansion board.
QA & Testing SOP (Dynamic & Transparent)
For a legacy substation expansion module, we verify identification, physical condition, connector integrity, and basic readiness before release.
- Part number verification: Confirm D20 EME on the module label. Record revision, serial number, and the 27-APR-13 date code where visible.
- Visual inspection: Check the PCB, connectors, Ethernet/fiber ports, serial ports, battery holder, and mounting hardware for corrosion, burn marks, or mechanical damage.
- Connector inspection: Verify Ethernet, serial, fiber/coax, and backplane connectors for bent pins, contamination, or poor contact.
- Battery and SRAM check: Inspect the battery-backed SRAM battery condition and holder integrity; note that battery replacement may be required for long-term storage.
- Chassis compatibility check: Confirm the module matches the target D20/D200 chassis slot and configuration.
- Firmware/configuration note: Where possible, record existing firmware or configuration references for traceability.
- Functional test limitation: Full functional testing requires a compatible D20/D200 chassis and SCADA environment; if not available, testing is limited to visual, electrical, and connector checks.
- ESD-safe packaging: Ship in anti-static bags with foam protection. Include part number, revision, and inspection status on the label.
Installation Pitfalls & Guide (Engineer to Engineer)
❗ Confirm chassis and slot compatibility. The D20 EME is designed for GE D20/D200 substation controller chassis. Do not install it in unrelated GE PLC or PACSystems racks.
❗ Ethernet media type must match configuration. Depending on the unit, it may support 10BASE-T, 10BASE-FL, or 10BASE2. Verify the installed interface before connecting network cables.
❗ Battery-backed SRAM may need replacement. Old modules may have depleted backup batteries, which can affect event buffering, configuration retention, or SRAM integrity.
❗ Protocol and IP settings are system-dependent. Modbus, DNP3, IEC 61850, and SCADA addressing must be verified against the existing D20 configuration.
❗ This is a legacy product. The D20/D200ME controller family has been discontinued, with G500 or D20MX/D200MX recommended as alternatives. Use D20 EME mainly for maintenance, spare replacement, or migration projects.
❗ Do not assume universal power compatibility. Power requirements depend on the D20/D200 chassis configuration. Verify the installed power supply and backplane voltage before installation.
Replacement steps:
- Pre-install: Record chassis type, slot position, IP address, serial port assignments, protocol settings, and SRAM configuration.
- Isolate: Follow substation or plant procedures before removing or inserting modules.
- Remove: Disconnect Ethernet/serial/fiber cables, then remove the module from the chassis without forcing connectors.
- Install: Seat the replacement D20 EME firmly, restore network and serial connections, and verify chassis recognition.
- Commission: Verify Ethernet link, serial communication, protocol connectivity, SRAM retention, and SCADA data flow before returning to service.
Technical FAQ
What is the GE D20 EME 27-APR-13?
It is a GE D20/D200 Ethernet and memory expansion module with a 27-APR-13 manufacturing or revision date marking. The base function is Ethernet/Memory Expansion for D20/D200 substation controllers.
Which Ethernet interfaces does it support?
Depending on configuration, it supports 10BASE-T, 10BASE-FL, and 10BASE2.
Can it be used in PACSystems RX3i or RX7i?
No. It belongs to the GE D20/D200 substation controller family, not the PACSystems RX3i/RX7i/PAC8000 families.
Is this module still in production?
The D20/D200ME controller family is legacy and discontinued. Availability is typically through surplus stock or spare parts channels.
What protocols can it support?
It can support Modbus, DNP3, IEC 60870-5, and IEC 61850 depending on system configuration and software.
