GE D20 EME 10BASE-T Ethernet & Memory Expansion Module

Description

Key Technical Specifications

The D20 EME is available in multiple configurations, including Ethernet only, Memory only, and Ethernet + Memory versions. Standard memory-equipped versions include 8 MB battery-backed SRAM, expandable to 16 MB with an optional memory expansion board.

Product Introduction & Supply Chain Strategy

The GE D20 EME 10BASE-T is a VME-based expansion module designed for the GE D20/D200 Substation Controller platform. It combines Ethernet communications with shared global memory, enabling multiple D20ME processors within the same chassis to exchange data while providing direct connectivity to 10 Mbps Ethernet networks. The Ethernet interface is implemented through a dedicated Media Interface Card (MIC) equipped with two RJ-45 ports.

The module is offered in several hardware configurations:

• Ethernet only
• Memory only
• Ethernet + 8 MB global memory
• Ethernet + 16 MB global memory (with expansion daughterboard)

For utilities operating legacy D20/D200 SCADA systems, maintaining 1–2 New Surplus D20 EME modules is recommended to reduce outage risk and mitigate increasing procurement lead times for discontinued hardware.

D20 EME 10BASE-T

D20 EME 10BASE-T

Installation & Configuration Guide

Stage 1 – Preparation

1. Perform Lock-Out/Tag-Out (LOTO).
2. Shut down the D20/D200 chassis.
3. Back up the RTU configuration.
4. Record Ethernet settings and node addresses.
5. Wear proper ESD protection.

Stage 2 – Removal

1. Remove the Media Interface Card (MIC) cable.
2. Release the retaining hardware.
3. Remove the EME board from the VME chassis.
4. Inspect the backplane connectors.
5. Verify battery condition if global memory is installed.

Stage 3 – Installation

1. Verify the replacement is the correct 10BASE-T version.
2. Install the EME module.
3. Connect the appropriate 10BASE-T Media Interface Card (GE Part No. 526-2110) using the supplied interconnect cable.
4. Reconnect Ethernet cables.
5. Secure all mounting hardware.

Stage 4 – Commissioning

1. Restore system power.
2. Verify Ethernet link LEDs.
3. Confirm shared memory operation.
4. Test SCADA communications.
5. Verify network connectivity from the control center.

Firmware / Software Versions & Upgrade Notes

• The D20ME processor must support CCU base software to access EME Ethernet and shared-memory functions.
• Verify compatibility between the EME module, D20ME processor firmware, and Media Interface Card.
• Preserve Ethernet addressing and communication parameters during replacement.
• After installation, verify network communication and shared-memory synchronization before returning the RTU to service.

Frequently Asked Questions (FAQ)

Q1. What is the function of the D20 EME 10BASE-T?

It adds dual-port 10BASE-T Ethernet communications and optional battery-backed shared global memory to GE D20/D200 VME-based substation controllers, enabling network connectivity and multi-processor data sharing.

Q2. What Ethernet interface does this version use?

This version uses 10BASE-T Ethernet with two RJ-45 connectors provided through the 526-2110 Media Interface Card (MIC). It connects to standard CAT5 or higher twisted-pair cabling.

Q3. Is shared memory included?

It depends on the ordered configuration. GE supplied Ethernet-only, Memory-only, and Ethernet + Memory variants with 0 MB, 8 MB, or 16 MB of battery-backed global memory.

Q4. Can it be installed without the Media Interface Card?

No. The Ethernet version requires the matching Media Interface Card (MIC) and interconnect cable to provide the physical RJ-45 Ethernet connections.

Q5. Is this module still manufactured?

The D20 EME is part of a mature legacy platform. While D20/D200 systems remain widely deployed, most replacement modules are sourced from remaining OEM or New Surplus inventory rather than ongoing production.

Q6. What warranty is typically available?

Professional industrial automation suppliers typically offer a 12 month warranty, together with functional testing, serial number verification, and ESD-safe packaging.

Q7. What inventory strategy is recommended?

For critical utility substations operating controllers, maintain 1–2 New Surplus D20 EME 10BASE-T modules, along with the appropriate 526-2110 Media Interface Card, to reduce procurement risk and support long-term maintenance of legacy SCADA infrastructure.