VMIC VMIVME 1128 Digital Input Board – VMEbus Industrial Interface
The VMIC VMIVME 1128 is a high-density digital input board designed for VMEbus-based industrial control and data acquisition systems. This board provides multiple input channels for monitoring digital signals from sensors, switches, and other field devices. Its flexible configuration options—including isolated and non-isolated input variants—make it suitable for a wide range of applications, from factory automation and process control to test and measurement systems.
Built on the robust VMEbus architecture, the VMIVME 1128 offers reliable performance in demanding environments, with protection against voltage transients and electrical noise commonly encountered in industrial settings. The board's modular design allows easy integration into existing VME chassis, providing a cost-effective solution for expanding digital input capabilities.
Key Features
Multiple Digital Input Channels: Configurable channel count to suit application requirements.
Flexible Input Voltage Ranges: Supports TTL, 5V, 12V, 24V, and 28V input thresholds, depending on the variant.
Optical Isolation: Available on select models to protect the VME system from external transients.
VMEbus Compatibility: Standard VME form factor with A16/D16 or A24/D32 addressing support.
Interrupt Capability: Each input channel can generate VMEbus interrupts for event-driven processing.
Industrial Grade: Designed for extended temperature operation and reliable performance in harsh environments.
Status Read-Back: Software-readable input states for system monitoring and diagnostics.
Technical Specifications
The VMIVME 1128 typically provides 32 or 64 digital input channels, with options for either single-ended or differential configurations. Input thresholds are software-selectable or hardware-jumper configurable to support various logic families. Optical isolation, where present, provides up to 2500V of isolation between the field inputs and the VMEbus.
The board supports multiple addressing modes and interrupt levels, with onboard registers for input data, interrupt control, and status monitoring. Power is derived from the VME backplane, with optional external field power connection available on some models.
Applications
Factory Automation: Monitoring limit switches, push buttons, and proximity sensors.
Process Control: Reading status signals from pumps, valves, and other field devices.
Test and Measurement: Acquiring digital signals from test fixtures and instruments.
Defense Systems: Interfacing with military vehicle sensors and switch panels.
Building Automation: Monitoring security sensors and access control systems.
Integration and Configuration
Installing the VMIVME 1128 is straightforward: the board plugs into any standard VMEbus backplane. Configuration is performed via onboard jumpers or software registers, allowing selection of base address, interrupt level, and input polarity. Comprehensive documentation is provided to assist with system integration.
Software support includes drivers for popular real-time operating systems such as VxWorks, Linux, and Windows, as well as example code to accelerate application development.
Benefits
Reliability: Robust design ensures consistent operation in industrial environments.
Flexibility: Configurable input ranges and isolation options suit diverse applications.
Scalability: Multiple boards can be installed in a single chassis for expanded I/O capacity.
Ease of Use: Standard VME interface and comprehensive software support simplify integration.
Conclusion
The VMIC VMIVME 1128 digital input board provides a reliable, flexible solution for monitoring digital signals in VMEbus-based industrial systems. With its robust design, configurable features, and VME compatibility, it is an ideal choice for engineers building scalable control and data acquisition systems.
