Abaco Systems / VMIC VMIVME-1111-040 64-Bit High-Voltage Digital Input Board

The Abaco Systems / VMIC VMIVME-1111-040 is a 64-bit high-voltage digital input board for VMEbus systems. It has 64 input channels with user-selectable voltage thresholds spanning 1.25 VDC to 66 VDC, supporting multiple signal types including contact closure, voltage source, current sinking, and differential signals. Each 32-input group is jumper-configurable for the desired signal type.

The board transfers data in 8, 16, or 32-bit formats and features buffered inputs with debounce conditioning. Differential line receivers offer RS-422/RS-485 compatibility with ±7V noise immunity. On-board Built-in-Test logic enables fault detection and isolation, while a front-panel Fail LED provides visual status indication.

Open-circuit behavior defaults to logic zero with jumper-selectable logic one override. An input filter option is available for enhanced signal integrity.

Technical Specifications

• Form Factor: Double Eurocard, VMEbus


• Input Channels: 64 total (two groups of 32)


• Data Transfer Width: 8, 16, or 32 bits


• Input Voltage Range: 1.25 VDC to 66 VDC


• User-selectable Thresholds: 1.25 V to 66 V


• Signal Types (per 32-input group): Contact closure, voltage source, current sinking, differential signals


• Differential Line Receivers: RS-422/RS-485-compatible, ±7V noise immunity


• Input Conditioning: Buffered with debounce; input filter option available


• Built-in-Test: On-board BIT logic for fault detection and isolation


• Open-Circuit State: Logic zero (default) or jumper-selectable logic one


• Status Indicator: Front-panel Fail LED

Key Features

• Flexible signal conditioning supports four input signal types with per-group jumper selection


• Wide voltage threshold range accommodates industrial and aerospace signal levels


• Differential line receiver architecture reduces susceptibility to EMI


• Integrated BIT capability streamlines fault isolation during system verification


• Configurable open-circuit behavior adapts to system fail-safe requirements

Typical Applications

• High-voltage industrial control and monitoring systems


• Aerospace and defense vehicle data acquisition


• Process automation with mixed signal inputs


• Real-time fault detection and system diagnostics

Compatibility & Integration Complies with VMEbus specification ANSI/IEEE STD 1014-1987, IEC 821, and 297. Direct drop-in replacement for the legacy GE / Abaco VMIVME-1111.