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
Digital Outputs
• 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.
