Description
The D20ME is available in both non-VME and VME configurations, while the related D20ME II adds selectable RS-232/RS-485 serial interfacing. The exact processor variant should therefore be verified from the installed hardware and legacy part number before replacement.
Key Specifications
| Parameter | Specification |
|---|---|
| Brand | GE |
| Product | WESDAC D20ME |
| Product Type | Main Processor Module |
| System | Multilin D20/D200 Substation Controller |
| Processor | 32-bit Motorola 68030 |
| MPU Clock | 40 MHz |
| Flash Memory | 2 MB |
| SRAM | 2 MB, including 512 KB battery-backed |
| BootROM | 512 KB |
| Real-Time Clock | 1.0 ms resolution; accuracy to ±2.0 ppm |
| D.20 Interfaces | 2 HDLC ports for peripheral-module links |
| Serial Ports | 7 programmable RS-232 ports on D20ME |
| Serial Speed | Up to 38,400 kbps on all 7 ports |
| Maintenance Port | RS-232, 9,600 baud |
| Power Consumption | 3.5 W typical; 5 W maximum |
| Diagnostics | Memory, configuration, serial-port, watchdog, communications and error-log diagnostics |
| Mounting | D20 non-VME or VME chassis, depending on variant |
| Legacy Processor P/Ns | 526-2004, 526-2005, 526-2006, 526-2007 and coated variants |
| Condition | Confirm at quotation |
| Availability | Confirm current stock |
| Warranty | Confirm with quotation |
| Dimensions | To be verified from exact hardware variant |
| Net Weight | To be verified from exact unit |
| Gross Weight | To be verified after export packaging |
| Country of Origin | To be verified from supplied unit/documentation |
GE specifies 2 MB Flash, 2 MB SRAM, and 512 KB BootROM for the D20/D200 main processor architecture, together with two HDLC peripheral links and seven programmable serial ports.
Hardware Variants
GE’s current spare-parts cross-reference identifies several processor configurations:
| Legacy Part Number | Configuration |
|---|---|
| 526-2004 | non-VME, 7 × RS-232 |
| 526-2004-CC | non-VME, 7 × RS-232, conformal coated |
| 526-2006 | non-VME, 7 × RS-232 / RS-485 |
| 526-2006-CC | non-VME, 7 × RS-232 / RS-485, conformal coated |
| 526-2005 | VME, 7 × RS-232 |
| 526-2005-CC | VME, 7 × RS-232, conformal coated |
| 526-2007 | VME, 7 × RS-232 / RS-485 |
| 526-2007-CC | VME, 7 × RS-232 / RS-485, conformal coated |
| 526-2007-ECC | VME, 7 × RS-232 / RS-485, epoxy conformal coated |
The GE cross-reference also provides smart catalog prefixes for these legacy processor assemblies and separates firmware and BootROM selection as configuration options.
GE WESDAC D20ME
Application
The WESDAC serves as the processing core of the D20 architecture. A non-VME D20 chassis uses one board in a single horizontal Eurocard slot, while VME-based D20/D200 configurations can use multiple processor boards. The D20 platform interfaces with substation equipment through D.20 peripheral I/O modules and direct serial or Ethernet connections.
Typical system functions include:
- SCADA data acquisition and control
- Communication with IEDs and satellite RTUs
- D.20 peripheral I/O management
- Protocol conversion
- Local automation applications
- Event and status data handling
- Maintenance and diagnostic functions
GE documents support for numerous host and IED communication protocols across the D20/D200 platform, with the actual supported protocol set dependent on the installed application and configuration.
vs. II
| Feature | II | |
|---|---|---|
| Processor Family | 68030 | 68030-based D20 platform |
| Programmable Serial Ports | 7 | 7 |
| Standard Interface | RS-232 | Selectable RS-232 / RS-485 |
| D.20 Peripheral Links | 2 HDLC | 2 HDLC |
| Memory Architecture | 2 MB Flash / 2 MB SRAM / 512 KB BootROM | Same basic architecture |
| Replacement Consideration | Verify exact hardware | Verify interface configuration and system requirements |
GE states that the II is functionally similar to the but adds per-channel selection between RS-232 and RS-485/RS-422 interfaces.
Replacement Verification
For a GE WESDAC replacement, verify the complete installed configuration rather than relying only on the generic designation:
- Legacy GE part number
- Non-VME or VME chassis
- RS-232 versus RS-232/RS-485 configuration
- Conformal-coating option
- Firmware version
- BootROM version
- Memory configuration
- Existing D20/D200 chassis
- Nameplate and board revision
- Required communication interfaces
GE documentation shows multiple hardware variants, so WESDAC alone is not sufficient to establish an exact drop-in replacement.
Supply Information
Brand: GE
Model: WESDAC
Product Type: Main Processor Module
Application: D20/ Substation Controller
Stock: Contact us for current inventory
Lead Time: Confirmed with quotation
Warranty: Confirmed with quotation
Condition: Confirmed against the actual unit supplied
Shipping: International shipping available; freight based on destination and final packed dimensions and weight.
FAQ
What is GE WESDAC ?
GE WESDAC is the main processor module for the D20/ substation controller family, providing CPU, memory, serial communications, maintenance access, and D.20 peripheral communications.
How many serial ports does the have?
The standard provides seven programmable RS-232 serial ports, plus a separate RS-232 maintenance port.
What processor and memory does the use?
GE specifies a 32-bit 68030 processor at 40 MHz, with 2 MB Flash, 2 MB SRAM including 512 KB battery-backed memory, and 512 KB BootROM.
Is WESDAC the same as II?
No. GE identifies the II as a related version with selectable RS-232 and RS-485/RS-422 interfaces.
What part numbers are associated with the ?
GE’s spare-parts cross-reference lists 526-2004, 526-2005, 526-2006, and 526-2007, plus conformal-coated variants.
Quote Request
Request a quotation for GE WESDAC . Please provide the required quantity and a clear photo of the module nameplate or the complete legacy GE part number so the exact processor variant, interface configuration, firmware/BootROM requirements, stock status, and shipping specifications can be verified.
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