XYCOM AIN XVME-560 PCB Analog Input Module

XYCOM AIN XVME-560 PCB

1. Core Overview

The XYCOM AIN XVME-560 is a high-performance, high-density Analog Input module designed for installation in VMEbus systems. Its primary function is to convert continuous analog signals from industrial field sensors (such as those for temperature, pressure, flow, level, etc.) into digital signals for the VME system’s main CPU to read and process.

2. Key Features and Specifications

• Bus Interface: Complies with the VMEbus standard (IEEE 1014), ensuring compatibility with various VME system chassis and mainboards.

• Input Channels:

  • Single-Ended Inputs: Up to 64 channels.

  • Differential Inputs: Up to 32 channels.

  • The mode is configured by jumpers on the board.

• Input Signal Range: Supports multiple software-selectable voltage ranges, typically including:

  • ±10 V

  • ±5 V

  • ±2.5 V

  • 0 to +10 V

  • 0 to +5 V

• Resolution: 16-bit high resolution. This provides up to 65,536 counts, enabling highly precise measurement of minute signal changes.

• Sampling Rate: Features a high sampling speed for rapidly scanning multiple channels, meeting the demands of real-time control applications.

• Input Impedance: Very high (typically >1 GΩ), ensuring minimal loading on the signal source being measured.

• A/D Converter: Utilizes a Successive Approximation Register (SAR) type ADC, offering a good balance between speed and accuracy.

• Data Format:

  • Straight Binary (for unipolar ranges, e.g., 0-10V)

  • Two’s Complement (for bipolar ranges, e.g., ±10V)

• Trigger Modes: Supports both software and external hardware triggering, providing flexibility for synchronized data acquisition.

• Interrupt Support: Features VMEbus interrupt capability to notify the main CPU upon conversion completion or errors, enhancing system efficiency.

• Watchdog Timer: Includes a watchdog timer to monitor the module’s health and initiate a safe reset in case of a fault.

3. Physical and Electrical Characteristics

• Board Size: Standard single Eurocard size, compliant with VMEbus specifications.

• Connectors: Analog signals are connected via one or two high-density, screw-locking connectors (e.g., DD-78 or similar) on the front panel, ensuring reliable connections in vibrating environments.

• Power Requirements: Typically powered by the +5V from the VMEbus, and may also require ±12V or ±15V, depending on the specific model and configuration.

4. Typical Applications

Due to its high channel count, high accuracy, and rugged design, the XVME-560 was primarily used in demanding industrial automation and process control fields, such as:

• Data Acquisition and SCADA (Supervisory Control and Data Acquisition) Systems

• Process Control Systems (Chemical, Oil & Gas)

• Test and Measurement Setups

• Power Monitoring Systems

• Laboratory Automation

5. Software and Configuration

The module was typically programmed by:

• Register Mapping: Programmers directly read from and wrote to the various control/status registers and data buffers defined in the card’s VME address space.

• Rockwell Automation/XYCOM Provided Drivers: For specific Real-Time Operating Systems (e.g., VxWorks, QNX) or proprietary systems, dedicated drivers were often available to simplify development.

6. Current Status and Replacement

• Status: This is a legacy/discontinued product. While VMEbus technology is very stable and reliable, it has been largely superseded by newer standards like VPX, CompactPCI, and PXI.

• Replacement & Support: For modern replacements, consider Rockwell Automation’s current analog input modules for the CompactLogix or ControlLogix platforms. For maintaining existing VME systems, this product is primarily sourced from the secondary market or surplus inventory suppliers.