Acromag / Xembedded / Xycom XVME-244 Digital I/O Module

The Acromag/Xembedded/Xycom XVME-244 is a VMEbus-compatible digital I/O module delivering 64 optically isolated channels - 32 inputs and 32 outputs - for industrial control applications. Each I/O group benefits from optical isolation, providing solid signal integrity in electrically demanding environments while maintaining full VMEbus compliance.

Technical Specifications

• 64 total channels: 32 inputs + 32 outputs


• Four isolated groups per function (8 channels each)


• Optical isolation between groups and VMEbus circuitry


• Form factor: 6U Double Eurocard (233.35 mm × 160 mm) Input Specifications


• Integrated debouncing circuitry eliminates contact bounce


• Four filtered inputs (one per group) available as read-only registers


• 35 VDC reverse bias protection Output Specifications


• Current sourcing configuration


• On-state output voltage: (V supply − 0.8V) minimum


• Power supply: 10–15 VDC or 15–30 VDC (jumper selectable)


• Default initialization disables all outputs during power-up, reset, or SYSFAIL


• Software-readable output status VMEbus Interface


• IEEE 1014 compliance


• A24/A16:D16/D08(EO) DTB Slave


• Interrupter: I(1)−I(7)(STAT), RORA


• Interrupt vector: D08(O)(DYN)


• SYSFAIL utility signal support

Key Features Optical isolation on all 64 channels eliminates ground loops and transient noise coupling. Input debouncing handles relay and switch contacts natively. Dual voltage supply operation accommodates varied industrial power architectures. Safe-state output defaults prevent unintended control signal activation during initialization or fault conditions. Software-readable outputs enable diagnostic feedback and state monitoring.

Typical Applications Factory automation, process control, motor sequencing, relay interfacing, industrial monitoring systems, and critical safety circuits requiring galvanic isolation.

Compatibility & Integration Full VMEbus slot compatibility with systems conforming to IEEE 1014. Direct integration into 6U VMEbus backplanes. Interrupt-driven or polled operation supported via standard VMEbus protocols.