Description
The GE WESDAC D20 C is the upper processing module of the D20 Combination I/O module used with GE D20/D200 substation control systems. In the D20C assembly, the WESDAC module processes acquired field data and communicates with the main D20 processor, while the WESTERM module provides the field-wiring termination interface.
The D20C is designed for smaller I/O point-count applications and supports a combination of digital status inputs, control outputs, and optional analog I/O. The exact I/O configuration depends on the installed D20C daughter-card option.
Key Specifications
| Parameter | Specification |
|---|---|
| Brand | GE |
| Product | WESDAC D20 C |
| Product Family | GE D20 / D200 |
| Product Type | Combination I/O Module / WESDAC Module |
| System | D20/D200 Substation Controller |
| Digital Inputs | Up to 16 |
| Control Outputs | Up to 8 momentary or dual-function trip/close outputs |
| Analog Input Options | Up to 16 |
| Analog Output Options | Up to 8 |
| Communication | D.20 Link |
| Maintenance Interface | WESMAINT D20 maintenance port |
| Field Termination | Via associated WESTERM D20 C module |
| Daughter Cards | D20 C1 / D20 C2 options |
| Legacy Part Numbers | 504-0002 WESDAC D20C+; 504-0003 WESDAC D20C HV |
| Exact Variant | To be verified from nameplate and hardware configuration |
| Condition | Confirm at time of quotation |
| Availability | Confirm current stock |
| Warranty | Confirm with quotation |
| Dimensions | To be verified from exact unit |
| 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 documentation identifies the D20C WESDAC as the processing component of the combination I/O assembly. The manufacturer’s documentation also identifies legacy WESDAC + and WESDAC HV variants.
GE WESDAC D20 C
I/O Configuration
The architecture allows several I/O arrangements. The standard provides 16 digital inputs and 8 control outputs. A D20C1 daughter board can provide 16 analog inputs, while a D20C2 daughter board provides 8 analog inputs and 8 analog outputs.
| Configuration | Digital Inputs | Control Outputs | Analog Inputs | Analog Outputs |
|---|---|---|---|---|
| 16 | 8 | — | — | |
| + D20C1 | 16 | 8 | 16 | — |
| + D20C2 | 16 | 8 | 8 | 8 |
Communication and Interfaces
The WESDAC D20 C communicates with the main D20 processor through the D.20 Link. GE documentation describes two DB9 connectors for D.20 Link daisy chaining, with the same cable assembly also providing power to the WESDAC D20 C. A separate DB9 WESMAINT port is provided for maintenance communication with a VT100 terminal or emulator.
The D.20 Link is a GE proprietary communication protocol; product families are also documented with DNP3 communication options depending on the ordered configuration.
Application
The GE WESDAC D20 C is used as part of GE D20/D200 remote terminal and substation control installations where a combination of digital and analog I/O is required. Its architecture allows the I/O processing electronics to be separated from the field-wiring termination module, making module replacement possible without disturbing the connected field wiring.
Replacement Verification
For a WESDAC D20 C replacement, verify the following against the installed module:
- Complete GE catalog or legacy part number
- LV or HV configuration
- Hardware revision
- D20/D200 controller version
- Installed daughter card
- I/O configuration
- D.20 Link or DNP3 communication option
- Connector configuration
- Existing module nameplate
- WESTERM D20 C termination module
The generic description “WESDAC D20 C” does not by itself establish the voltage variant or daughter-card configuration. GE documentation lists multiple WESDAC variants and optional daughter boards, so these details should be checked before replacement.
Supply Information
Brand: GE
Model: WESDAC D20 C
Product Type: Combination I/O WESDAC Module
Application: D20/D200 Substation Controller
Stock: Contact us for current inventory
Lead Time: Confirmed with quotation
Warranty: Confirmed with quotation
Packing: Export packing available
Shipping: International shipping available; final freight depends on destination and packed dimensions/weight.
FAQ
What is GE WESDAC D20 C?
It is the WESDAC processing module used in the GE combination I/O architecture. It processes field I/O data and communicates with the main D20 processor.
What I/O does the support?
The supports up to 16 digital inputs and 8 control outputs, with optional analog expansion through daughter boards.
Is WESDAC D20 C the same as WESTERM D20 C?
No. They are separate components of the D20 Combination Module. The WESTERM D20 C handles field-wiring termination, while the WESDAC D20 C processes the acquired data and communicates with the main D20 processor.
Does WESDAC D20 C have different versions?
Yes. GE documentation identifies legacy WESDAC + and WESDAC HV versions, along with several analog-I/O daughter-card configurations.
Can you verify a replacement before shipment?
Yes. The installed-unit nameplate, complete part number, hardware revision, daughter-board configuration, and D20 system information should be checked before order confirmation.
Quote Request
Request a quotation for GE WESDAC D20 C. Please provide the required quantity, destination country, and a clear photo of the existing module nameplate. This allows the exact WESDAC variant, I/O configuration, availability, and shipping information to be verified before quotation.
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