Detailed Product Description of XYCOM XVME-979

I. Product Overview

XYCOM XVME-979 (now under the Acromag/Xembedded brand) is a 6U dual-high VMEbus multi-functional storage module, specially designed for Xycom XVME-654, XVME-655 and other PC/AT architecture VME processors. The module integrates optical drive, hard drive and floppy drive interfaces, creating an "optical reading and writing + large-capacity fixed storage + removable medium backup" integrated local storage solution. It is suitable for industrial control, embedded measurement and control, military aviation, rail transportation and other harsh environments, meeting core requirements such as system booting, data recording, program backup and batch data exchange. It is the core selection for storage expansion and upgrade of outdated VME systems. 

II. Hardware Specifications and Configuration

(1) Physical Form and Bus Compatibility

Size Specification: Standard 6U dual-height design, with dimensions of 165mm × 50mm × 115mm. It occupies only one standard VME slot and is compatible with VME64 and VME64x chassis.

Bus Interfaces: Strictly follows the VMEbus IEEE 1014 standard. Power is obtained through the VME backplane P1 connector, and storage signals are transmitted through P2 connector. It can directly connect to XVME-65x series processors without the need for additional adapter modules.

Structural Process: Adopt industrial-grade reinforced welding technology. The core area of the board card is strengthened against vibration. The overall weight is approximately 380g, suitable for installation in strong-vibration industrial sites.

(2) Core Storage Units (Configured by Model)

1. Optical Drive Unit (Front, ATAPI/EIDE Interface)

As the core optical storage component of the module, it provides multi-version compatibility to meet read-only, read-write, and high-definition storage requirements:

XVME-979/1: Configured with 24X CD-ROM drive, supporting read-only access, suitable for basic program loading and data reading scenarios.

XVME-979/2: 24X CD-ROM drive + external floppy drive interface, balancing optical reading and small batch data backup.

XVME-979/3: CD-R/W rewritable optical drive + external floppy drive interface, supporting optical disc data recording and backup.

XVME-979/4: CD-R/W rewritable optical drive + 2.5-inch IDE hard drive + external floppy drive interface, achieving "optical reading + large-capacity storage + mobile backup" full functionality coverage.

XVME-979/5: DVD-R/W rewritable optical drive + external floppy drive interface, supporting high-definition DVD data reading and large-capacity backup.

XVME-979/6: DVD-R/W rewritable optical drive + 2.5-inch IDE hard drive + external floppy drive interface, providing a full configuration storage solution for high-end applications.

Optical Drive Performance: Supports PIO Mode 4, DMA Mode 2 transmission modes, with burst transmission rate up to 16.6MB/s. Compatible with multi-session Photo CD, VCD, enhanced CD, CD Plus and other mainstream optical disc formats. Some versions support high-speed transmission of 33.3MB/s.

2. Hard Disk Unit (Optional, 2.5-inch IDE Interface)

Capacity Specification: Standard configuration is 1.3GB and 2.2GB. Optional industrial-grade hard drives in the range of 1GB - 6GB. Suitable for different capacity requirements.

Performance Parameters: 1.3GB hard drive average access time 14ms, 2.2GB hard drive average access time 12ms, inter-track seek time 4ms. Supports PIO/DMA transmission modes, meeting industrial data high-speed reading and writing requirements.

Installation Design: Board-mounted dedicated hard drive installation slot, using reinforced fixation structure to avoid loose hard drives or read/write failures due to vibration.

3. Floppy Drive Interface (Front, External Adapter)

Interface Specification: Standard 3.5-inch, 1.44MB high-density floppy drive interface, compatible with XVME-9000-EXF model external floppy drive.

Function and Usage: Used for small batch program backup, configuration file export, system failure emergency repair, suitable for lightweight data exchange scenarios in industrial sites. Power consumption parameters: The power consumption of the optical drive in operation is approximately 5W, the power consumption of the hard drive is approximately 6W, and the power consumption of the floppy drive is approximately 2W. The entire machine adopts a low-power design to reduce the heat dissipation pressure of the chassis and is suitable for scenarios of continuous operation for a long time.

(4) Front panel design

The front panel integrates status monitoring and operation interfaces, facilitating on-site debugging and maintenance: equipped with an optical drive tray and pop-up button, an external interface for the floppy drive, an LED indicator light for the hard drive (flashing indicates normal reading and writing, constantly on indicates a fault), a power/fault alarm indicator light. It can monitor the operation status of the module in real time and quickly locate hardware faults.

III. Environmental adaptability and reliability

(1) Temperature adaptation range

Operating temperature: The standard version is 0℃~55℃, the wide temperature version is - 25℃~70℃, suitable for extreme temperature conditions such as outdoor without air conditioning, vehicle-mounted, and military applications.

Storage temperature: -40℃~+85℃. During long-term storage or transportation, the components will not be damaged and the performance will not be degraded, suitable for industrial equipment with long-term storage requirements.

(2) Protection and anti-interference capability

Protection level: The front panel reaches IP30 protection standard, effectively preventing dust and splashing water, suitable for industrial sites with dust, oil, and moisture.

Vibration and shock resistance: Under operation, it can withstand 5~500Hz, 2g vibration and 20g shock; in non-operation state, it can withstand 50g shock. Suitable for strong vibration scenarios such as machine tools, rail transit, and vehicle-mounted applications.

EMC performance: Compliant with IEC 61000-6-2 industrial electromagnetic compatibility standards, with onboard EMI filtering circuitry, it can effectively suppress static electricity, surges, and high-frequency electromagnetic interference, and can operate stably in strong electromagnetic environments such as high-voltage equipment and frequency converters.

(3) Hardware reliability guarantee

Component selection: The core chips and connectors use military-grade industrial components, with full board-level welding process to avoid false soldering and detachment problems.

Mean Time Between Failures (MTBF): ≥120,000 hours, supporting 15 years of continuous uninterrupted operation, matching the long service cycle requirements of industrial equipment.

Error handling mechanism: Errors during reading and writing are automatically retried to ensure data integrity; Versions /2, /4, /6 support transparent defect mapping, can automatically reassign bad sectors, without formatting, to repair small disk faults, reducing maintenance costs.

Signal integrity: The board lines adopt impedance-matching design, IDE/ATAPI signal transmission has no attenuation, long-distance signal transmission is stable, avoiding data packet loss or reading/writing errors.

IV. Core functions and product features

(1) Multi-media integration, full-function coverage in a single slot

6U dual-high size integrates optical drive, hard drive, and floppy drive interface for three types of storage units, a single slot solves the three core requirements of large-capacity fixed storage, optical reading and writing, and removable backup, saving chassis slot resources, simplifying the system hardware architecture, and reducing equipment integration costs.

(2) Rich models, flexible configuration suitable for multiple scenarios

From the basic CD-ROM read-only version to the high-end DVD-R/W + hard drive full configuration version, covering different budgets and different storage requirements scenarios, users can flexibly select based on actual applications (such as only needing program loading, needing data burning, needing large-capacity storage), avoiding redundant or insufficient functions.

(3) Standard protocol compatibility, plug-and-play without drivers

Fully compatible with PC/AT IDE, ATAPI, and floppy drive standards, suitable for mainstream industrial operating systems such as MS-DOS, VxWorks, embedded Linux, and QNX, no additional development of dedicated driver programs is required, access to the system can identify and use it, reducing the threshold of secondary development and debugging cycle.

(4) Support local system boot, reducing external dependencies The optical drive or hard disk can both serve as the system boot disk for the VME processor, enabling local boot of the industrial control system without relying on network boot or external storage devices. This enhances the system's independence and boot stability, and is suitable for industrial sites without network or unstable network conditions.

(5) Long lifecycle support, compatible with existing equipment upgrades

Acromag/Xembedded provides long-term spare parts supply and technical support. It is designed for industrial equipment with a 10-15 year service life and is widely compatible with old VME equipment (such as CNC machines, industrial robots, DCS systems) for storage expansion and upgrade, solving the problems of insufficient original storage capacity and outdated interfaces of the existing equipment, and extending the equipment's service life.

VII. Typical Application Scenarios

Industrial Automation: Local program and configuration data storage for production line control systems, historical data and alarm logs for DCS/SCADA systems, data cache and backup for PLC replacement systems.

Embedded Measurement and Control: Large-capacity data cache for high-speed data acquisition systems, program storage for instrument control units, backup and export of experimental data for laboratory automation devices.

Military / Aviation: Key data recording for vehicle measurement and control systems, storage units for airborne ground test equipment, local boot and data storage for radar preprocessing systems, program backup for military embedded platforms.

Transportation / Energy: Vehicle control program and operation data storage for rail transit, backup of monitoring data from wind power / photovoltaic sites, offline data storage for smart grid monitoring devices, data recording for ship control systems.

Upgrade of existing equipment: Expansion of optical reading and large-capacity storage for old VME-structured industrial equipment (CNC machines, robots, old industrial control computers), solving the problems of insufficient original interfaces and insufficient capacity, and completing equipment upgrades at a low cost.

VII. Compatibility Instructions

(1) Compatible Processor Modules

Direct compatibility: XVME-654, XVME-655 series VME processors, no additional configuration required, directly connected for use.

Compatible compatibility: XVME-653, XVME-689, XVME-690 and other series processors, need to confirm the compatibility of P2 connector signals in advance to ensure normal data transmission.

(2) Compatible Enclosures

Supports all standard 6U VME enclosures (VME64, VME64x), requires a reserved double-high slot, and the enclosure should be equipped with complete P1 (power) and P2 (signal) connectors to ensure stable power supply and signal transmission.

VIII. Installation and Maintenance Precautions

Before installation, the VME enclosure power must be cut off, and hot-plugging operations are strictly prohibited; during installation, gently insert and push the module, ensure that the P1 and P2 connectors are fully engaged, tighten the fixing screws to prevent vibration from causing the module to loosen or have poor contact.

Daily monitoring of status through the front panel LED indicators: The disk light flashes for normal reading and writing, constantly lit indicates a disk failure; when the optical drive cannot eject, power off and check the mechanical structure to avoid forcibly pulling and damaging components.

Regular maintenance: Use a dedicated cleaning disc to clean the magnetic head of the optical drive every 6 months to avoid read/write lag or failure; avoid frequent forced power off of the hard disk to reduce the generation of bad sectors; regularly clean the dust on the interface of the floppy drive to prevent poor contact.

During long-term operation, keep the enclosure ventilation good, regularly clean the dust on the surface of the modules and at the interface to avoid component aging or short circuit due to high temperature or dust accumulation.

Storage and transportation: Avoid exposure to strong corrosive and strong magnetic environments, strong magnetic fields may cause data loss on the disk; during transportation, take protective measures to prevent severe impact from causing board cards or storage components to be damaged.