The Abaco Systems / VMIC VMIVME-1181-000 is a 32-channel digital input board with programmable Change-of-State (COS) interrupt capabilities for VMEbus systems. The board captures state transitions on its input channels and generates interrupts based on user-defined conditions, enabling real-time event monitoring and response in mission-critical applications. A 512-event FIFO buffer preserves state-change data during interrupt servicing, eliminating data loss in high-activity environments.
Technical Specifications
Digital Input
• 32 channels via P2 high-reliability DIN connector
• Input impedance: 33 kΩ
• Threshold accuracy: ±10% over 1.25 V to 66 V input range
• User-selectable voltage thresholds: 1.25 V to 66 V
Change-of-State Interrupt Logic
• Programmable via Control and Status Register (CSR)
• Selectable trigger modes: no interrupts, falling edge only, rising edge only, any transition
• Event buffer capacity: 512 state changes (FIFO)
Input Conditioning
• Jumper-selectable debounce times: 10 µs, 1 ms, 5 ms, 10 ms
• Contact bounce elimination on make and break
• Transient suppression for ground noise and crosstalk
• Per-octet (8-channel group) input mode selection: contact closure, voltage source, or current sinking
• Open-circuit programmable to logic “0” or logic “1”
VMEbus Interface
• VMEbus Rev. C.1 compliant
• Address range: A24:A16
• Data width: D32:D16:D08 (EO) with 8-, 16-, or 32-bit transfer support
• Slave address: DTB 39, 3D
• Interrupt vector: D08 (ROAK)
• COS data port: D0B(0)
Built-In Diagnostics
• On-board BIT logic for fault isolation
• Front panel fail LED indicator
Form Factor
• Double Eurocard (6U)
– Key Features
• Flexible edge-triggered or level-based interrupt selection
• High input impedance minimizes loading on source circuits
• Wide voltage threshold range accommodates multiple signal types
• Debounce filtering eliminates contact chatter and electrical noise
• FIFO-based event capture prevents data loss in interrupt-heavy scenarios
– Typical Applications
• Industrial process monitoring and discrete I/O control
• Safety-critical systems requiring deterministic event response
• Real-time data acquisition with transient detection
• Legacy VMEbus system modernization and expansion
– Compatibility & Integration
Designed for direct integration into VMEbus Rev. C.1 systems. Supports standard 16-bit and 32-bit data bus architectures. Jumper configuration enables field customization without firmware modification.
