Application Scenarios
In a typical nuclear power auxiliary control system, engineers faced the challenge of replacing obsolete VME processor boards without rewriting the entire control application. By inserting the VMIVME-77504 into the existing 6U VME chassis, the plant was able to preserve its legacy VME64 I/O modules while gaining a 1.26 GHz computing platform capable of running VxWorks with deterministic response times under 50 microseconds. The dual Ethernet interfaces allowed the VMIVME-77504 to simultaneously communicate with the plant’s DCS network and the remote diagnostic center, eliminating the need for a separate communication processor. In petrochemical compressor stations, the VMIVME-77504 has been deployed to handle high-speed data acquisition from vibration monitoring modules, execute complex anti-surge control algorithms, and stream process data to the central SCADA server—all within a single VME slot, with the hardware watchdog automatically recovering the system from software faults to achieve over 99.99% availability.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | VMIVME-77504 |
| Manufacturer | GE Fanuc (VMIC series) |
| Product Category | VMEbus Single-Board Computer (6U) |
| Processor | Intel Pentium III, up to 1.26 GHz, 512 KB Advanced Transfer Cache |
| System Memory | Up to 512 MB PC133 SDRAM via single 144-pin SODIMM |
| System Bus | 133 MHz hosted by Intel 815E chipset |
| Graphics | Integrated AGP SVGA controller, 4 MB display cache, up to 1600×1200 resolution |
| Ethernet | Dual 10/100BaseTX RJ45 ports, Intel 82559 controllers, supports remote LAN boot |
| Expansion | One PMC (PCI Mezzanine Card) site per IEEE P1386 |
| VME Interface | VME64-compliant, Universe IIB PCI-to-VME bridge, 32/64-bit data bus |
| Mass Storage | IDE CompactFlash socket, up to 1 GB; 32 KB battery-backed NV SRAM |
| Serial Ports | Two RS-232 ports, up to 115 Kbaud; one parallel port; two USB ports |
| Form Factor | 6U single-slot Eurocard, 233.4 × 160 × 20.3 mm |
| Power Requirement | +5 VDC ±5% (typical 6 A, max 7 A); +12 VDC (max 200 mA); −12 VDC (max 75 mA) |
| Operating Temperature | 0 °C to 50 °C (standard); extended-range options available |
| OS Support | Windows XP/2000, VxWorks, Linux, QNX, LynxOS, Solaris |
| Reliability Features | Hardware watchdog timer, MIL-STD-810-grade shock and vibration resistance |
Technical Principles and Innovative Values
Innovation Point 1: High-bandwidth PCI-to-VME bridging. The VMIVME-77504 employs the Newbridge/Mundra Universe IIB interface chip to bridge the 133 MHz PCI domain to the VME64 backplane, delivering sustained data throughput far beyond conventional VME SBCs and enabling the board to act as a system controller, requester, or intelligent slave node.
Innovation Point 2: Superscalar processing with on-chip L2 cache. The Pentium III processor executes up to three instructions per clock cycle, with 256 KB or 512 KB of full-speed Advanced Transfer Cache. This gives the VMIVME-77504 the compute density to run multi-tasking real-time control loops, protocol stacks, and HMI services concurrently without performance degradation.
Innovation Point 3: Dual-independent boot paths. Combining onboard 1 GB CompactFlash and Lanworks BootWare over dual Ethernet, the supports diskless remote booting via NetWare, TCP/IP, or RPL. This innovation eliminates mechanical storage failure points in the field and dramatically simplifies fleet-wide software upgrades.
Innovation Point 4: Ruggedized passive cooling. The adopts a fanless thermal design with conduction-friendly components, enabling reliable operation in dust-laden, high-vibration environments such as rail, mining, and marine installations where rotating fans would be a liability.
Application Cases and Industry Value
In a regional power grid transmission substation modernization project, the utility replaced 22 aging VME controller boards with modules across eight 220 kV bays. The boards ran a VxWorks-based bay control application that handled protective relay communication over IEC 60870-5-104, local HMI rendering via the AGP graphics output, and time-critical GOOSE message exchange through the dual Ethernet ports. After 18 months of continuous operation, the maintenance team reported zero unplanned downtime and a 40% reduction in rack-space footprint, because the consolidated three previously separate boards (CPU, Ethernet, and graphics) into one. In a separate offshore drilling platform deployment, the served as the primary controller for mud-logging and blowout-preventer monitoring, with the built-in watchdog recovering the system within 200 ms of a detected software exception—a capability that directly contributed to the platform’s safety case certification.
