Acromag / Xembedded / Xycom AVME9440-I-L Isolated Digital I/O Board w/ LEDs

The Acromag/Xembedded/Xycom AVME9440-I-L is a VMEbus-compatible isolated digital I/O board that delivers optical isolation for both inputs and outputs in demanding industrial control environments. The board prevents voltage transients and ground loops through channel-to-channel and VMEbus isolation, supporting TTL and CMOS logic interfacing. Front-panel LED indicators provide real-time status visibility across all channels.

Technical Specifications

• Solid-state relay, SPST-NO (Form A) architecture


• Output voltage range: 0 to 55V DC (OFF state)


• Leakage current: 5 µA DC maximum (OFF state)


• Output current: 0 to 1A DC @ 0 to 40°C


• Current derating: 10 mA/°C above 40°C


• ON-state voltage: 0.5V DC maximum @ 1A DC


• Response time: 2.0 ms maximum @ 1A DC


• Output fuse: F1-32, 2A Digital Inputs


• Optical relay isolation from VMEbus and between channels


• Selectable input threshold voltages for contact closures, alarm trips, and switches Isolation Performance


• VMEbus isolation: 250V AC optical isolation


• Channel-to-channel isolation: 250V AC or 354V DC continuous


• Surge withstand: 1500V AC for 60 seconds Indicators


• 64 red LEDs on front panel for channel status indication (with -L option) VMEbus Interface


• Compliance: VME Specifications revision C.1 (October 1985), IEC 821-1987


• Configuration: A24/A16:D16/D08 (EO) DTB slave


• Address modifiers: 29H, 2DH, 39H, 3DH


• Memory map: 1K byte (standard or short address space)


• Access time: 590 nS typical Environmental


• Operating temperature: 0 to 70°C


• Storage temperature: -55 to 85°C


• Relative humidity: 5% to 95% non-condensing Power


• +5V DC: 2.5A maximum (all inputs ON with LEDs)

Key Features

• Optical isolation prevents transient damage and eliminates ground loop coupling


• Solid-state relay outputs eliminate mechanical switching delays


• Selectable input thresholds accommodate diverse signal types


• Field connections via front-panel connectors


• PASS/FAIL status indicators for diagnostic feedback

Typical Applications

• Valve control and monitoring


• Switch counter interfacing


• Indicator lamp operation


• Industrial control systems requiring voltage isolation

Compatibility & Integration Fully compliant with VMEbus standards. TTL and CMOS logic-compatible inputs and outputs enable integration with standard industrial control architectures.