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
