VMIC VMIVME-4941 – VME I/O Board for Reliable Machine Control and Legacy System Support

The VMIVME-4941 is a proven 6U VMEbus I/O board from the VMIC/GE Fanuc legacy line, typically deployed in industrial automation, test stands, and process equipment where deterministic, rack-level I/O matters. From my experience, this model is chosen when customers need stable, long-life support for existing VME systems rather than a complete redesign. You might notice that it slots into a single VME slot, draws its power from the backplane, and plays nicely with common real-time OS environments used in the VME world.

In many cases it serves as the “field I/O bridge” for machines—interlocks, sensors, contact closures, or discrete outputs. If you’re maintaining a GE Fanuc/VMIC platform, this board seems to be the practical, low-risk way to keep production humming while avoiding a costly migration.

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Key Features

• 6U VME form factor – Single-slot Eurocard design that fits standard VME and VME64x enclosures.
• Deterministic discrete I/O handling – Designed for real-time control loops, interlocks, and machine permissives.
• VMEbus interrupt support – Typically supports vectored interrupts for fast event response.
• Backplane-powered – Draws regulated +5 VDC from the VME backplane; simplifies cabinet wiring.
• Legacy system continuity – Ideal for sustaining GE Fanuc/VMIC-based lines without revalidating entire control stacks.
• Industrial-grade build – Rugged PCB assembly, suited to continuous operation in controlled cabinets.
• Software-friendly – In most cases used with VxWorks or similar RTOS; integrators often provide driver/examples.

Technical Specifications

Related or Supporting Products

• VMIVME-4132 – 64‑channel TTL digital output card; often paired when more discrete outputs are required.
• VMIVME-4116 – High-density digital input board with isolation; used for sensor and interlock collection.
• VMIVME-4140 – Mixed DIO option; useful when you need both inputs and outputs on one board.
• Standard 6U VME chassis and power supply (5 V/12 V rails) – For cabinet upgrades or expansions.
• Shielded I/O cables and DIN-rail breakouts – Eases field wiring and reduces electrical noise in cabinets.

One thing I appreciate is how this model slots neatly alongside the VMIC 41xx digital I/O family—teams can scale channels without changing the control concept. A customer in a packaging line retrofit told me they kept their motion and PLC strategy intact and simply added one 4941 to capture more discrete signals, saving weeks of requalification.

Installation & Maintenance

• Cabinet & cooling: Install in a 19-inch VME/VME64x chassis with adequate forced-air cooling. Maintain clear airflow in front of and behind the card.
• Wiring: Use shielded, properly grounded field cables for longer runs. Keep I/O wiring separated from high-voltage drives to minimize noise.
• Grounding & ESD: Ground the chassis to a clean plant earth. Handle the board with ESD protection during installation and service.
• Address/interrupt setup: Set VME address and interrupt vectors per your system map to avoid conflicts; label positions for future maintenance.
• Routine maintenance: Periodically reseat the board during shutdowns, inspect connectors, and clean dust filters in the chassis. Firmware/EEPROM revisions, if present, should match system images—most teams keep a golden spare.

Quality & Certifications

• Manufacturing quality system typically ISO 9001 (VMIC/GE Fanuc legacy lines).
• CE conformity when integrated in a CE-marked system enclosure; EMC depends on cabinet design and wiring.
• RoHS compliance varies by build year; many legacy versions are not RoHS—please confirm the exact revision if this is critical.
• 365-day warranty coverage from shipment; units are functionally tested prior to dispatch.