Technical Specifications: Main Processor: Freescale 68030, operating frequency 40MHz Memory Resource: 2MB Flash memory, 1.5MB SRAM, 512KB NVRAM Serial Interfaces: Seven configurable RS‑232/RS‑485 serial ports Special Link Interface: Two D.20 HDLC proprietary links for I/O expansion and peer‑to‑peer communication Supported Protocols: DNP3, Modbus RTU/TCP, IEC 60870‑5‑104 and other power industry protocols Programming Standard: IEC 61131‑3 programming language support Operating Power Supply: 20‑60VDC wide‑range DC power input Operating Temperature: ‑10°C to +55°C Storage Temperature: ‑40°C to +85°C Relative Humidity: 5%‑95%, non‑condensing Mechanical Dimension: Standard D20 series chassis plug‑in module Certifications: ANSI/IEEE C37.90, CE, industrial EMC compliance
Functional Features: Deterministic sub‑millisecond real‑time control cycle for substation automation logic processing. Supports large‑scale I/O point expansion up to 4000 control points. Multiple industrial and power communication protocols for seamless interconnection with third‑party IED equipment. 
Application Scenarios: Electric power substation automation control system. Power distribution station monitoring and protection control unit. Industrial plant power monitoring and SCADA data gateway. Legacy D20 system renovation and spare‑part replacement project. Distributed power‑grid local automatic control application.
Structural Characteristics: Plug‑in card structure matching D20 series standard chassis. Front‑panel LED indicators for power, running, fault and communication link status. Front‑panel maintenance debugging port for on‑site parameter configuration.
Working Principle: After power‑on, module loads user control logic stored in Flash memory. Processor collects data from external I/O modules through D.20 HDLC link interface. Serial ports complete protocol conversion and data exchange with field intelligent devices and upper SCADA master station.
Installation Requirements: Insert module into corresponding slot of GE D20 series standard chassis. Wire power supply according to 20‑60VDC wide‑range DC input specification. Connect D.20 link cables for I/O expansion module interconnection. Serial communication wiring adopts shielded cables, separate signal cables and high‑voltage power cables.
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