Xycom XVME-957 VMEbus Digital I/O Board for Legacy Industrial Control and Test Stands

The Xycom XVME-957 is a 6U VMEbus I/O board used widely in legacy machinery, aerospace test benches, and factory automation where dependable, high-density digital signals are needed. From my experience, it’s typically specified for mixed or high-count digital I/O with robust isolation and interrupt support, making it a practical drop-in for existing VME systems that can’t afford downtime. You might notice that many plants keep the XVME-957 on hand specifically to stabilize older lines while planning longer-term upgrades.

Our Order Process and Guarantees

• – Warranty period: 365 days (repair/replace, like-for-like)

• – Delivery time: typically 1 week if in stock; no more than one month at the latest

• – Payment terms: 50% advance payment; full payment prior to delivery

• – Express options: FedEx, UPS, DHL

– Each unit is function-checked prior to dispatch; test report available on request

Key Features

• 6U VMEbus form factor – Fits standard 6U Eurocard VME chassis for fast replacement without panel modifications.
• High-density digital I/O – Typically used for large channel-count applications; channel mapping varies by assembly/revision.
• Opto-isolation on most builds – Helps protect the backplane and host CPU from field transients and ground loops.
• Interrupt and change-of-state support – Useful for event-driven logic, machine safety signals, and sequencers.
• Rugged, proven design – Common in semiconductor tools, defense test racks, and endurance rigs where long service life matters.
• Front or rear I/O options – Many installations route signals via the front high-density connector or through the VME P2 region to transition modules.
• Field-serviceable in most cases – Replaceable fuses/isolators on some revisions; easy swap with standard extractor handles.

Technical Specifications

Note: The XVME-957 has seen multiple revisions and option assemblies. The entries below reflect what’s commonly encountered in industrial environments. If you need exact channel counts or connector pinouts for your build, share your assembly/REV code and we’ll verify before shipment.

Brand / Model	Xycom XVME-957
HS Code	847330 (Parts and accessories of ADP machines – commonly used for VME I/O boards)
Power Requirements	From VME backplane: +5 VDC (typical 0.5–1.5 A depending on I/O population); other rails as fitted on some assemblies
Dimensions & Weight	6U Eurocard, approx. 233.35 mm (H) × 160 mm (D); weight typically 0.5–0.8 kg
Operating Temperature	0 to +55 °C (commercial); 5–95% RH non-condensing
Signal Input/Output Types	Digital I/O, optically isolated on most revisions; channel density varies by build; front connector or P2 rear I/O depending on assembly
Communication Interfaces	Standard VMEbus backplane interface; designed for 6U VME systems
Installation Method	Plug-in 6U VME card with injector/ejector handles; secured to front panel guide rails

Where it’s typically used

• Retrofits of legacy automated assembly lines needing stable digital I/O without rewriting host software.
• Aerospace and defense test racks where VME signal conditioning and deterministic interrupts are required.
• Semiconductor and vacuum tools with long-qualified VME control cabinets.
• Powertrain and endurance test cells running long-duration digital sequencing.

A maintenance lead told us last quarter: “Swapping in an XVME-957 kept our old VME cage alive over shutdown. No code changes, and the digital maps lined up with our pinout. That saved us a week.”

Related and Supporting Products

• Xycom XVME-220 / XVME-240 series – Alternative VME digital/analog I/O cards; different channel mixes and conditioning.
• Xycom XVME-650 series CPU boards – If you’re refreshing the host controller alongside I/O, these are common companions.
• VME P2 transition modules and ribbon/breakout cables – For rear I/O wiring when front-panel cabling space is tight.
• Surge suppression and relay interface panels – Helpful when driving inductive loads or isolating field wiring.

Installation & Maintenance

• Cabinet and airflow – Install in a standard 6U VME chassis with guided card slots; maintain unobstructed airflow from chassis fans. In many cases, a simple dust filter cleaning improves thermal headroom.
• Wiring and grounding – Use shielded cables for noisy environments; keep field grounds and logic grounds separated where the assembly provides isolation.
• Power budgeting – Verify +5 V backplane capacity; high channel-count or opto-populated boards can draw over 1 A under load.
• Safety – De-energize the chassis before insertion/removal; avoid live-insertion unless the system explicitly supports it.
• Routine maintenance – Annual connector clean and visual inspection; check front-panel fasteners and ejector handles. Firmware isn’t typical for pure I/O boards, but host drivers/config files should be backed up.
• Documentation – For pinouts and channel maps, reference the XVME-957 assembly or REV code; variants differ slightly.

Quality & Certifications

• CE-compliant design for industrial environments (typical for this series).
• UL recognition is common on the chassis level; board-level marks vary by revision.
• RoHS: early revisions are often non-RoHS due to legacy components; we can provide RoHS status per serial/REV.
• Standard 365-day warranty provided by us; functional testing prior to shipment.