XVME-240 70240-001 is a TTL-level digital input/output module compatible with the VMEbus, developed by Xycom Automation.It features a high-density 80-channel design: 64 channels configured as 8 byte-wide bidirectional I/O ports, plus 8 configurable interrupt inputs and 8 flag outputs.With excellent programmability, high channel density, and industrial-grade environmental robustness, it serves as a critical data interface between host controllers and external devices in industrial automation and digital system interconnection applications.The module complies with the IEEE 1014 VMEbus specification and Xycom Automation standard I/O architecture, supporting integration into a wide range of VMEbus-based systems.

Core Product Features

• High-Density Bidirectional I/O
• 64 bidirectional TTL I/O channels divided into 8 independent ports.Each port can be individually programmed as input or output via the port direction register, enabling flexible signal configuration with high channel density and low cost per channel.
• Programmable Interrupt Inputs
• 8 interrupt input lines support external devices to trigger any VMEbus interrupt level.Users can configure interrupt signals to be latched on rising or falling edge.Each interrupt can be independently masked via a programmable interrupt mask register for precise matching with external device requirements.
• Multi-Function Flag Outputs
• 8 flag output lines can be used as external interrupt acknowledgments or general-purpose control signals for connected equipment, extending the module’s control and communication capabilities.
• Industrial-Grade Hardware
• Built with industrial-grade components and robust circuit design.Provides electrical isolation up to 500Vrms or higher, effectively suppressing electrical noise and interference to ensure signal integrity and system safety.
• High-Speed VMEbus CompatibilityBased on the VMEbus architecture for high-speed parallel data transfer, low I/O latency, and improved real-time performance.Fully compatible with other VMEbus modules and systems for easy integration and expansion.

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Key Technical Specifications

Electrical Characteristics

• Input
• High-level input voltage: min. 2.0V, max. 5.5VLow-level input voltage: max. 0.8VLow-level input current: max. 0.2mASupports standard TTL-level input signals.
• Channel Output
• Low-level output voltage: max. 0.5V @ 48mA, max. 0.4V @ 16mALow-level sink current: max. 48mAHigh-level source current: max. 3mA @ 2.4V, max. 15mA @ 2.0V
• Flag Output
• Low-level output voltage: max. 0.5V @ 24mA, max. 0.4V @ 12mALow-level sink current: max. 24mAHigh-level characteristics match channel outputs.
• Power Requirements
• +5V DC (±5% tolerance)Typical current: 2.7A (all outputs high), 3.6A (all outputs low)Power consumption: approx. 5W

Environmental Specifications

• Temperature
• Operating: 0°C ~ 65°C (32°F ~ 149°F)Non-operating: -40°C ~ 85°C (-40°F ~ 185°F)
• Humidity
• Operating: 20% ~ 80% RH (non-condensing)Non-operating: 20% ~ 90% RH (non-condensing)
• Altitude
• Operating: 0 ~ 3,048 m (10,000 ft)Non-operating: 0 ~ 12,192 m (40,000 ft)
• Vibration & Shock
• Operating: 5~2000Hz vibration (0.38mm p-p, 1.0g); 30g peak, 11ms shockNon-operating: 5~2000Hz vibration (0.76mm p-p, 2.5g); 50g peak, 11ms shockComplies with IEC 60068-2-27/28.
• EMC
• Complies with IEC 61000-4-2/3/4/6.

Mechanical & Bus Specifications

• Dimensions
• Dual-slot 6U VME card233.7mm × 160.0mm (9.2 in × 6.3 in)
• VMEbus Compliance
• IEEE 1014 compliantSupports A24/A16:D16/D08(EO) DTB SlaveInterrupter: I(1)–I(7)(STAT), RORAInterrupt vector: D08(O)(DYN)Supports SYSFAIL utility signal.

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Operating Principle

• Signal Input
• External TTL digital signals enter the input channels and are conditioned by input buffers to improve stability and drive capability.Signals then pass through electrical isolation to eliminate noise, and are converted to standard logic levels.Isolated signals are stored in internal data buffer registers for the host to read via VMEbus.The module continuously monitors channel status and reports to the host.
• Signal Output
• The host sends commands and data to the module’s internal registers over VMEbus.Processed data is driven and level-shifted by output buffers, isolated, and then sent to external devices to control motors, valves, indicators, etc.Onboard logic coordinates all operations to ensure accurate signal transmission.
• Interrupt & Flag Functions
• Interrupt inputs capture external trigger signals (rising/falling edge) and issue interrupt requests to the VMEbus host.Flag outputs provide interrupt acknowledgment or control signals to external devices, forming a complete signal interaction loop.

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Applications

• Industrial Automation
• Expansion I/O for PLC/DCS systems; connects sensors and actuators in assembly lines and robotic workstations for control and monitoring.
• Digital Equipment Interconnection
• Interface for printers, DIP switches, Opto 22 I/O systems, and other digital subsystems.
• Power, Oil & Petrochemical
• Relay protection, switch control, valve and pump station digital I/O in power plants, substations, and process facilities.
• Laboratory & Test Instruments
• High-speed data acquisition, measurement, and control in automated test systems.
• Building & Transportation Automation
• Digital control for HVAC, lighting, rail transit, and airport facilities.
• Parallel Port Device Control
• TTL-level interface for parallel peripherals, ensuring reliable communication with control systems.

Related Products & Warranty

• System Expansion
• Can be stacked with other Xycom XVME series modules (e.g., XVME-202, XVME-244) for multi-function system integration.

Installation & Usage Notes

• Environment
• Install in dry, ventilated area; avoid high temperature, humidity, dust, and strong EMI.
• Hardware Installation
• Insert firmly into 6U dual-slot VMEbus chassis; ensure latches are locked.Verify +5V±5% power supply and clean, undamaged backplane before installation.
• Wiring
• Follow the manual to distinguish I/O channels; use shielded cables and proper grounding.Use bolted terminals and fuses for high-current outputs.
• System Configuration
• Add the module in the host system (DCS/SCADA/PLC), set address mapping (typically 0x00~0xFF), load driver, and configure interrupts and port directions.
• Maintenance
• Regularly clean dust and ensure ventilation.Check cables for damage or looseness.Troubleshoot power and wiring first for I/O errors.Power off and observe ESD protection when replacing modules.