Abaco Systems / VMIC VMIVME-1182-030 Digital Input Module

The Abaco Systems / VMIC VMIVME-1182-030 is a VMEbus-compatible digital input module delivering 64 optically isolated channels for event detection, pulse counting, and time-tagged data logging. The module detects changes of state, monitors event sequences, and accumulates pulse counts across all channels with configurable debounce filtering and programmable interrupt generation.

Technical Specifications

Channel Configuration
• 64 digital input channels
• Optical isolation between channels and to VMEbus
• Channel-to-channel isolation: 1,500 VDC or 1,100 VRMS
• Channel-to-VMEbus isolation: 1,500 VDC or 1,100 VRMS

Input Voltage Ranges
• 5 to 60 VDC
• 110 to 240 VAC
• Configurable for voltage sensing or contact sensing

Change-of-State (COS) Detection
• Software-controlled per channel
• Detection modes: disabled, rising edge, falling edge, or any edge
• Minimum state duration: 2 ms
• Minimum detectable pulse width: 2 ms
• Minimum signal period: 4 ms

Sequence of Events (SOE) Monitoring
• Dual-buffer architecture for simultaneous processing and loading
• Time-tagged event storage with 1.0 ms resolution
• Relative timer range: 0 to 65,535 ms (resettable from VMEbus)

Pulse Accumulation
• 64 Pulse Accumulation Count (PAC) registers
• Maximum count per channel: 65,535 pulses
• Edge recognition on both rising and falling transitions
• Overflow flag or optional interrupt notification

Debounce Control
• Software-programmable per channel
• Debounce range: 1.25 ms to 1.024 s

Interrupt Capabilities
• COS-triggered interrupt generation
• User-selectable interrupt levels
• Single-byte vector output during acknowledge cycle

– Key Features

• Onboard buffer for time-tagged event data enables forensic analysis of input sequences
• Per-channel debounce eliminates spurious signal noise
• Dual SOE buffers allow continuous event capture during data retrieval
• Programmable interrupts reduce processor polling overhead

– Typical Applications

• Industrial control and supervisory monitoring
• Power system event recording and disturbance analysis
• Process automation with multi-channel state tracking
• Real-time fault detection and sequence logging

– Compatibility & Integration

VMEbus-compatible architecture supports standard VME crate installations. Module integrates with existing VME-based control systems requiring distributed digital input acquisition with timing precision.