GE WESDAC D20ME - Westinghouse Digital Electronic System D20ME Data Acquisition and Control Module

GE WESDAC D20ME – Westinghouse Digital Electronic System D20ME Data Acquisition and Control Module

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Product Introduction:
The GE WESDAC D20ME is a data acquisition and control module from the Westinghouse Digital Electronic System (WESDAC) family, which GE acquired when it purchased Westinghouse’s power systems division. The “D20ME” designation indicates a 20-channel, multi-function module that combines analog input, analog output, and digital I/O in a single board. The “ME” suffix stands for “Multi-Function Electronic.” This module was widely used in GE Mark I, Mark II, and Mark III nuclear power plant control systems, as well as in fossil fuel power plants and industrial process control. The WESDAC D20ME is a legacy but still actively maintained product, with thousands of units in service worldwide in critical infrastructure.

Technical Specifications:
Board Type: WESDAC Multi-Function Data Acquisition Module
Designation: D20ME (20 Channel, Multi-Function)
Channels: 20 channels total (typically 8 analog inputs, 4 analog outputs, 8 digital I/O)
Analog Inputs: 8 channels, 12-bit resolution, 4-20mA or 0-10V
Analog Outputs: 4 channels, 12-bit resolution, 4-20mA or 0-10V
Digital I/O: 8 channels (4 inputs + 4 outputs, 24V DC)
Update Rate: 100ms for analog, 10ms for digital
Isolation: 500V RMS channel-to-ground
Backplane: WESDAC proprietary backplane (not standard VME)
Power: 5V DC from backplane
Form Factor: WESDAC Eurocard (similar to 3U VME but with different pinout)
Operating Temperature: 0 to 60 degrees Celsius

Functional Features:
Multi-Function in One Slot: Combines analog input, analog output, and digital I/O, reducing the number of boards needed.
Legacy Compatibility: Fully compatible with all WESDAC backplanes and CPUs from the Mark I/II/III era.
On-Board Signal Conditioning: Performs cold junction compensation and linearization for thermocouple inputs.
Watchdog Timer: Hardware watchdog ensures fail-safe operation in nuclear safety systems.
LED Diagnostics: Per-channel LEDs for instant status verification.
Field Replaceable: Can be replaced in minutes without reprogramming the CPU.

Application Scenarios:
Nuclear Power Plants (Mark I/II/III): Monitors reactor temperature, pressure, and neutron flux in GE-designed nuclear plants.
Fossil Fuel Power Plants: Controls boiler feedwater, turbine auxiliary systems, and emissions.
Industrial Process Control: Manages chemical processes, refineries, and petrochemical plants.
Legacy System Maintenance: Keeps decades-old WESDAC systems running with modern replacement parts.

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