Abaco Systems/VMIC VMIVME-2536-200

The Abaco Systems/VMIC VMIVME-2536-200 is a 32-channel optically coupled digital I/O board for VMEbus systems. It delivers galvanic isolation between field signals and the VME chassis, eliminating ground loops and protecting circuitry from voltage transients. The board supports field voltages from 5 V to 125 V, user-selectable input/output configurations on byte boundaries, and programmable contact debounce.

All 32 input and 32 output channels feature optical coupling with sustained isolation of 1 kV (field to VMEbus) and pulsed isolation of 3.5 kV. Channel-to-channel isolation reaches 500 V sustained. Built-in diagnostics support system reliability in industrial automation, process control, and data acquisition environments.

Technical Specifications

Form Factor

• 6U single slot Eurocard Digital Inputs


• 32 optically coupled input channels


• Field-to-VMEbus isolation: 1 kV sustained, 3.5 kV pulsed


• Channel-to-channel isolation: 500 V sustained (maximum)


• Input voltage options: 5 V, 12 V, 24 V, 28 V, 48 V, 125 V


• Configurable voltage sensing or contact sensing (byte boundaries)


• Debounce options: 0, 0.256, 0.512, 1.024, 2.048, 4.096, 8.192, 16.384 ms


• Input isolation resistance: 10 MΩ minimum Digital Outputs


• 32 optically coupled open-collector output channels


• Maximum output voltage: 50 V


• Current sinking: 300 mA per output


• Output leakage current: 500 µA maximum (at 50 V, 60 °C)


• User-configurable pull-up resistors on byte boundaries

Key Features

• Dual isolation stages protect sensitive VMEbus logic from field transients


• Jumper-selectable power sources for contact sensing and pull-up resistor bias


• Programmable debounce for contact-closure applications


• Voltage sensing suitable for 125 V inputs; contact sensing for lower voltages


• Configurable input thresholds matched to operating voltage class

Typical Applications

• Industrial process control and automation


• Data acquisition from distributed sensors


• Machine interface and alarm monitoring


• Factory floor I/O signal conditioning

Compatibility & Integration

• VMEbus form factor for direct 6U single-slot deployment


• Compatible with standard VME chassis infrastructure