Description
Key Technical Specifications
- Model Number: WESDAC D20 C (504-0002-13)
- Manufacturer: GE Fanuc / Westinghouse
- Series/System: D20 Distributed Control System / RTU
- Module Type: Logic Panel / Data Acquisition Processor
- Architecture: Top-half removable module (pairs with WESTERM D20 C base)
- Digital Inputs: 16 Channels
- Control Outputs: 8 Instantaneous / Dual-function Trip/Close
- Analog Options: 16 AI, or 8 AI + 8 AO
- Communication: DNP3 Protocol, D.20 Link (High-speed HDLC)
- Connectors: Dual DB9 (Daisy-chain & WESMAINT Maintenance Port)
Functional Role & Application Analysis
The GE WESDAC D20 C 504-0002-13 is the intelligent processing half of a two-piece D20C RTU I/O module. In distributed energy and process control, you cannot rely on dumb I/O blocks. This logic panel handles the heavy lifting. It acquires field data, executes local logic, and transmits it back to the main D20 master processor over a high-speed D.20 link. The modular design allows you to pull this top panel for maintenance or replacement without disturbing the field wiring on the bottom WESTERM base.
Engineers deploy this module in critical infrastructure environments:
- Power Substation RTUs: Gathering digital status and analog telemetry from switchgear, then communicating upstream via DNP3 protocol.
- Water & Wastewater SCADA: Providing local control outputs for pump stations and valve actuators when master communication is lost.
- Pipeline Monitoring: Acting as a remote data concentrator in harsh environments, utilizing the DB9 daisy-chain capability to expand I/O density.
- Legacy System Maintenance: Sourcing exact replacements for failed logic panels in aging Westinghouse/GE D20 RTU networks.
Our Quality Standard & Testing Process
RTU logic panels fail silently. A bad microprocessor might power on but refuse to negotiate the D.20 link, leaving operators blind. We test every WESDAC D20 C to verify its communication integrity and processing logic.
- Visual & Component Inspection: We inspect the DB9 connectors for bent pins, check the mating edge connectors for wear, and verify the PCB shows no signs of moisture damage or thermal stress.
- Live System Test: The module is mated with a WESTERM D20 C base in a test rack and powered up. We run a continuous burn-in to verify stable processor operation and power draw.
- Full-Function Diagnostics: We verify D.20 link communication with a master simulator, test the WESMAINT maintenance port, and validate digital input scanning and relay output actuation.
- Warranty Backing: Only modules that pass all communication and I/O diagnostics ship with our 12-month warranty. Any unit with marginal link negotiation is rejected.
WESDAC D20 C 504-0002-13
Compatibility & Migration Paths
The D20C is a two-piece system. You must match the top and bottom halves correctly. Verify these points before ordering:
- Base Module Matching: The WESDAC D20 C logic panel MUST be installed on a WESTERM D20 C base. It is not compatible with other D20 variants (e.g., D20K bases).
- Part Number Verification: Confirm your required part number is 504-0002-13. Revision differences in the WESDAC panel can affect firmware compatibility with your master D20 CPU.
- D.20 Link Configuration: Verify your master processor supports the D.20 link protocol version implemented in this logic panel. Older masters may require a firmware update.
- Maintenance Port Access: If you use the WESMAINT DB9 port for field commissioning, ensure you have the correct VT100 terminal emulator or equivalent software configured for serial communication.
- Get Expert Help: Unsure if this WESDAC panel is compatible with your existing WESTERM base or master CPU? Contact our technical team with your system configuration for a free compatibility check.
