The Abaco Systems VMIVME-1111-030 is a 64-bit high-voltage digital input board for VMEbus systems, delivering flexible signal monitoring across contact closure, voltage source, current sinking, and differential topologies. Each 32-input group is jumper-selectable, with user-configurable input voltage thresholds spanning 1.25 V to 66 V. The board integrates onboard Built-in-Test logic for rapid fault detection and isolation, supported by a front panel Fail LED indicator.
Technical Specifications
Architecture & Connectivity
• VMEbus compliance: ANSI/IEEE STD 1014-1987, IEC 821, IEC 297
• Form factor: Double height Eurocard
• Input channels: 64 differential or high-voltage digital inputs
• Connectors: Dual 64-pin DIN 41612
• Data transfers: 8-, 16-, or 32-bit
• Addressing: Eight independently addressable ports on 8-, 16-, or 32-bit boundaries; one Control and Status Register on 8-bit boundary; thirteen jumpers for unlimited address map selection
Input Characteristics
• Input voltage range: 1.25 V to 66 V DC
• Jumper-selectable threshold accuracy: 1% across the entire 66 V range (typical)
• Input impedance: 33 kΩ (single-ended and differential)
Differential Signals
• Common-mode input voltage: −30 V to +66 V
• Input sensitivity: ±100 mV over common-mode range −7 V to +12 V
• RS422/RS485-compatible differential line receivers with ±7 V noise immunity
Signal Conditioning & Protection
• Open circuit state: Jumper-selectable logic zero or logic one
• Input filter option: Series RC terminator or 0.14 ms time constant filter
• Surge protection: ANSI/IEEE STD C37.90.1-1982 compliance
– Key Features
• Supports contact closure, voltage source, current sinking, and differential signal monitoring
• Accommodates mechanical switch contacts, relay contacts, electronic switching circuits, standard logic circuits, and Opto 22 type signal conditioning modules
• Front panel Fail LED for BIT status visibility
• Flexible jumper configuration for independent 32-input group operation
– Compatibility & Integration
This board integrates directly into VMEbus backplanes and operates across industrial voltage environments from 1.25 V to 66 V, making it suitable for mixed-signal acquisition in automated control and instrumentation systems.
