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.