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These boards provide an economical method for isolating and interfacing digital I/O signals to the VMEbus. Built-in optical relays eliminate the expense of external relay panels and simplify installations. The outputs can control valves, switch counters, mechanical/optical relays, indicator lamps and more.

On-board relays isolate all inputs and outputs from each other and from the VMEbus for protection against transients from ground loops and pick-up.

Selectable input threshold voltages let the user adapt the input points to a variety of applications including contact closures, alarm trips, switches, and power supply on/off monitoring.

Debounce circuitry offers a selectable time delay to eliminate false signals resulting from contact bounce commonly experienced with mechanical relays and switches.

Features

• 16 input and 16 output channels
• On-board optical relays
• All inputs and outputs are isolated from the VMEbus and from each other
• Interfaces to TTL and CMOS logic
• Optional LEDs indicate channel status
• Adjustable debounce circuitry
• Vectored interrupts for change-of-state, level (polarity), or pattern detection
• User can read back output states
• Outputs sink up to 1 Amp DC, from up to a 55V DC source