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GE WESDAC D20A｜Analog Scan Module｜
Product Overview
GE Vernova D20 Series – High-Density Analog Input Module
This module is designed for high-precision analog signal acquisition within the GE Vernova D20 protection and control system, providing stable, accurate measurement of voltage and current signals for power, process, and industrial automation applications.
Processing & Memory
Processor: Freescale 68HC11 8-bit MPU
Clock frequency: 2 MHz
Memory configuration:
32 KB EPROM
24 KB static RAM
512 B EEPROM
Analog Input Specifications
Channel Configuration
Number of channels: 32
Input type: Differential inputs
Supported Signal Ranges
Voltage: ±5 V, ±10 V
Current: ±1 mA, ±2.5 mA, ±5 mA, ±10 mA, ±20 mA
Measurement Performance
Accuracy:
Voltage: ±0.05%
Current: ±0.1%
Resolution: 14-bit + sign
Temperature drift: ±10 ppm/°C
Electrical Characteristics
Input impedance: 44 MΩ ±5% (DC signals)
Overvoltage rating: 35 VDC
Overload withstand: 200 Vpp
Conversion Rate
32-channel full scan:
550 ms @ 60 Hz
656 ms @ 50 Hz
Communication Interfaces
D.20 Link:
2 × ports for cascading multiple modules
Maintenance interface:
1 × RS-232
Baud rate: 9600 bps
Power Supply
Supply voltage: 24 VDC
(Provided by D20 PS power supply module)
Typical power consumption: 4 W
Key Advantages
High-density acquisition: 32 differential channels in a single module
High measurement accuracy and stability, suitable for protection and precise monitoring
Wide signal compatibility, supporting multiple voltage and current ranges
Robust electrical protection, with high input impedance and strong overvoltage tolerance
Seamless D20 system integration via D.20 Link communication
Low power consumption, ideal for large-scale I/O deployments
Typical Application Areas
Power systems: Analog acquisition of bus voltage, current, and auxiliary signals in substations
Process industry: Pressure, flow, and level signal acquisition for DCS and PLC systems
Industrial automation: High-precision monitoring of production line process variables in harsh environments
GE WESDAC D20A｜Analog Scan Module｜
By structuring the information in this manner, the article provides a clear and organized understanding of input channels, transducer supply, and communication implementations in distributed control systems.
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