Abaco Systems / VMIC VMIVME-1181-000 32-Channel P2 Input Board with Change-of-State

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 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.