Abaco Systems / VMIC VMIVME-1182-001 Digital Input Module

The Abaco Systems / VMIC VMIVME-1182-001 is a 64-channel optically isolated digital input module for VME systems. It detects changes of state (COS) on each input and time-tags events for Sequence-of-Events (SOE) acquisition, analysis, and monitoring in industrial control and data acquisition applications.

Technical Specifications

• 64 digital inputs with optical isolation


• 1,500 VDC or 1,100 VRMS channel-to-channel and channel-to-VMEbus isolation


• Input voltage range: 5 to 60 VDC, 110 to 240 VAC, 5 VDC, 4 VAC, 5 to 250 VDC, or 4 to 240 VAC


• Measurement resolution: 1.0 ms


• Time-tag capability: relative timer value up to 65,535 ms Change-of-State Detection & Pulse Counting


• Software-controlled COS detection per channel (disabled, rising edge, falling edge, or any edge)


• Count registers per channel; up to 65,535 pulses per channel


• Programmable debounce: 1.25 ms to 1.024 s (software-controlled per channel)


• Minimum detectable pulse time: 2.0 ms


• Minimum period for continuous input signal (both edges): 4.0 ms Sequence-of-Events (SOE) Monitoring


• Onboard SOE buffer with time-tagged COS data


• Dual-buffer architecture for simultaneous processing and loading VMEbus Interface


• VME 6U form factor


• A24 and A16 address space support (jumper-selected)


• Base address set by jumpers A23–A14; 8 Kword address space


• Address modifier bits: nonprivileged, supervisory, or either (jumper-selected)


• Programmable interrupts on any software-selectable level


• Single-byte vector placed on bus during acknowledge (ROAK); interrupt cleared on acknowledge

Key Features

• Front-panel opto-isolated inputs for voltage or contact sensing


• Channel 32 configurable as wetting voltage source for all channels


• ANSI/IEEE STD C37.90.1-1989 surge protection compliance (with companion suppression panel, e.g., VMIVME-3459)

Physical & Environmental

• Operating temperature: 0 to 50 °C (full ratings); derated to half power at 70 °C


• VME 6U single-height module

Typical Applications Power systems monitoring, substation automation, industrial process control, and event-driven data logging where high-speed state transition detection and timing accuracy are critical.