Xycom XVME-674

The XVME‑674 is a single‑slot VMEbus CPU/processor module launched by XYCOM (now a subsidiary of ABB). It is designed for high‑reliability scenarios such as industrial automation, process control, manufacturing, and robotics. Adopting a PC/AT compatible architecture, it provides traditional PC computing capabilities while being compatible with the real‑time characteristics of the VME bus, enabling long‑term stable operation in harsh environments.

Key Technical Specifications

• Processor: 33 MHz 80486DX or 66 MHz 80486DX2 (some documents mention the Motorola 68040 at 25 MHz)
• Memory: Optional 4 MB, 16 MB, or 32 MB DRAM; some models are equipped with 2 MB SRAM
• Storage: Built‑in IDE hard disk controller and floppy disk controller, allowing direct connection of hard disks/floppy disks
• Display: VGA graphics controller that supports standard display output
• Interfaces: 2 × RS‑232 serial ports, 1 × parallel port, and VMEbus interruptor circuit (supporting 7 levels of interrupts)
• Power Supply: 220 V AC (some documents indicate 24 V DC)
• Operating Temperature: -40 °C ~ 85 °C, with military‑grade vibration and shock resistance
• Size/Weight: Single‑slot, 1.20 lb (approximately 0.55 kg)

Product Features

• High Reliability: Utilizes military‑grade components and has a wide temperature range, making it suitable for extreme industrial sites.
• Modular Expandability: Through VME slots, expansion cards for I/O, communication, and storage can be flexibly added to achieve customized functions.
• Multi‑Protocol Compatibility: Supports VME64x, VMEbus standards, and common industrial protocols (Ethernet, RS‑232/485, USB, etc.), and is compatible with XYCOM and other brands of VME devices.
• Developer‑Friendly: Provides a cross‑platform SDK and Linux/RTOS drivers to shorten the secondary development cycle.
• Hardware Health Monitoring: Built‑in sensors for temperature, voltage, etc., to realize predictive maintenance and fault early warning.

Structure and Composition

• CPU Motherboard: Contains the core processor, memory slots, VGA controller, and hard disk/floppy disk controller.
• VME Interface Card: Responsible for bus signal conversion, address mapping, and interrupt management.
• Power Module: Accepts 220 V AC (or 24 V DC) and provides internal voltage stabilization.
• Heat Dissipation System: Combines heat sinks and fans to ensure heat dissipation in high‑temperature environments.
• Expansion Slots: Reserved VME slots for subsequent insertion of I/O, communication, or memory cards.

Typical Application Fields

• Industrial Automation Control: PLCs, DCSs, and fieldbus gateways.
• Manufacturing and Robotics: Real‑time motion control and machine vision processing.
• Power and Energy: Power plant monitoring and power distribution automation.
• Process Control: Continuous production processes in chemical engineering, petroleum, metallurgy, etc.
• Military and Aerospace: Embedded computing platforms requiring high reliability and anti‑interference capabilities.

Installation and Maintenance Points

Installation

1. Insert the module into the corresponding slot of a VME‑compliant chassis or backplane, and ensure the latch is securely locked.
2. Connect the power cable, heat dissipation fan, and necessary external I/O (serial port, parallel port, Ethernet, etc.).
3. Check the address mapping and interrupt configuration of the VME bus to ensure compatibility with the host computer or other modules.

Debugging

1. After startup, check the BIOS/firmware version through VGA output or a remote terminal.
2. Use the provided SDK or driver to conduct basic function tests (memory, storage, serial communication).
3. Verify interrupt response and priority using a VME interrupt test tool.

Daily Maintenance

1. Regularly check if the heat sinks and fans are dusty, and maintain good heat dissipation.
2. Monitor the power supply voltage and internal temperature, and use the alarm thresholds of the hardware health monitoring module for early warning.
3. Back up the firmware and configuration files; if necessary, the firmware can be upgraded via JTAG or serial port.
4. For systems that have been shut down for a long time, it is recommended to perform a power‑on self‑test every 6 months to prevent startup failure caused by capacitor aging.

Troubleshooting

• Failure to Start: Check the power supply, slot latch, and VME bus power supply; use a diagnostic card to read error codes.
• Communication Abnormalities: Confirm the serial port/Ethernet cable, baud rate settings, and whether the VME interrupt is masked.
• Overheating: Clean the heat sinks, check the fan speed, or replace with a higher‑power heat dissipation solution.

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