Technical Specifications: Main Processor: Freescale 68030, 40MHz working frequency Memory Resource: 2MB Flash memory, 1.5MB SRAM, 512KB NVRAM Serial Interfaces: Seven configurable RS‑232/RS‑485 serial ports D.20 Link: Two proprietary HDLC links for I/O expansion Bus Interface: VME64 back‑plane bus interface Supported Protocols: DNP3, Modbus RTU/TCP, IEC 60870‑5‑104 power‑industry protocols Operating Power Supply: +5VDC, ±12VDC obtained from VME back‑plane Operating Temperature: ‑10°C to +55°C Storage Temperature: ‑40°C to +85°C Relative Humidity: 5%‑95%, non‑condensing Mechanical Dimension: Standard 6U single‑slot VME Eurocard Certifications: ANSI/IEEE C37.90, CE, industrial EMC compliance
Functional Features: Retains all D20ME substation‑automation real‑time control and multi‑protocol communication functions. Realizes data interaction with other VME‑bus modules through VME64 back‑plane bus. Supports D.20 link to expand external D20 series I/O termination modules. NVRAM retains key configuration and event data under power‑off condition.
Application Scenarios: VME‑chassis‑based D20 substation automation control system. Power‑substation VME‑platform automation transformation project. D20ME‑VME type spare‑part replacement and maintenance for legacy system.
Structural Characteristics: Standard 6U single‑slot plug‑in VME module mechanical structure. Front‑panel LED indicators for power, running, fault and communication link status. Front‑panel maintenance debugging port for on‑site parameter configuration. P1/P2 golden‑finger connectors for VME back‑plane bus interconnection. D.20 link and serial‑port external terminals for I/O expansion and device connection. PCB conformal coating for moisture‑proof and anti‑electromagnetic‑interference performance in substation environment. Vibration‑resistant mechanical locking screws.
Working Principle: Module obtains power supply from VME back‑plane golden‑finger connector. After power‑on, it loads user control logic stored in Flash memory. It can exchange data with other VME modules via VME64 bus; meanwhile connects D20 series I/O termination modules through D.20 HDLC link.
Installation Requirements: Insert module into designated slot of standard 6U dual‑P1/P2 VME chassis. Cabinet grounding must strictly comply with power‑substation safety technical specification. Connect D.20 link cables and serial‑port communication shielded cables; separate signal cables and high‑voltage power cables.
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