Abaco Systems / VMIC VMIVME-1184-000000 32-Bit Change-of-State (COS) Input Board with Sequence-of-Events (SOE)

The Abaco Systems / VMIC VMIVME-1184-000000 is a 32-bit Change-of-State (COS) input board engineered for VMEbus systems requiring high-speed digital event capture and sequence-of-events analysis. This optically isolated module provides 32 configurable channels for voltage sensing or contact closure monitoring, with programmable state-change detection, interrupt generation, and deep FIFO buffering. It enables multi-board synchronization through external clock inputs for correlating more than 32 signals across distributed acquisition systems.

Technical Specifications

• Digital Input Channels: 32 optically isolated COS inputs


• Input Voltage Ranges: Field-configurable per channel - 5V, 12V, or 24-28V


• Input Modes: Voltage sensing or contact closure detection


• COS FIFO Buffer: 512 states deep


• Debouncing: Software-selectable for contact closure inputs


• VMEbus Data Transfers: D32, D16, D08 (EO) accesses; byte, word, and long word support; D32 for COS data


• Interrupt Levels: User-selectable I(1) through I(7); programmable vector


• Interrupt Clearing: FIFO-empty (ROFE) or acknowledge (ROAK) modes


• Address Modes: A24 and A16 with corresponding modifiers; switch-selectable base address


• Form Factor: 6U VMEbus (166 × 233.4 mm)


• VMEbus Compliance: ANSI/IEEE STD 1014-1987, IEC 821 and 297

Key Features

• Programmable per-channel COS detection with interrupt generation on state transitions


• Sequence-of-events monitoring with before/after state comparison


• External clock synchronization for multi-board event correlation


• Per-channel LED status indicators


• Supervisory and non-privileged addressing modes


• Standard VME or IEEE 1101.10 front panel options

Typical Applications

• Critical industrial monitoring and alarm event sequencing


• Power systems protection and fault analysis


• Substation automation and SCADA data acquisition


• Multi-channel discrete signal event logging requiring precise time correlation

Compatibility & Integration Fully compliant with VMEbus Specification ANSI/IEEE STD 1014-1987 and IEC standards. Supports synchronous multi-board operation via external clock input for extended monitoring beyond 32 channels.