The VME7865RC V7865-23003 is a high-performance, high-density digital input/output (I/O) module designed for the rugged and deterministic VMEbus industrial computing and control platform. Part of a specialized family of VME I/O cards, this module serves as a critical interface between a real-time VMEbus computer system and the external world of industrial sensors, actuators, and discrete control signals. Its primary function is to provide a large number of optically isolated or high-voltage digital I/O channels, enabling the host system to monitor the status of field devices (e.g., limit switches, pushbuttons, proximity sensors) and control industrial loads (e.g., solenoids, relays, indicator lamps) with high speed and reliability. The specific suffix RCand part number V7865-23003likely denote a particular configuration, such as a specific mix of input and output channels, voltage ratings (e.g., 24V DC or 110/240V AC), and isolation characteristics.
The VME7865RC is engineered for demanding applications where deterministic response, high channel count, and environmental robustness are paramount. Typically deployed in real-time control systems for industrial automation, test stands, military/aerospace simulation, and data acquisition, this module excels in environments with significant electrical noise, vibration, and wide temperature ranges. Its value lies in its ability to consolidate a large number of I/O points onto a single, high-reliability card, reducing system footprint, wiring complexity, and potential failure points compared to using multiple smaller modules. By providing a direct, low-latency bridge between the VMEbus backplane and industrial field wiring, the VME7865RC V7865-23003 enables precise, synchronous control and monitoring critical for complex machinery, automated test equipment, and high-fidelity simulation systems.
Technical Specifications
Parameter Name
Parameter Value
Product Model
VME7865RC V7865-23003
Manufacturer
Likely a specialized I/O manufacturer (e.g., SBS Technologies, GE Fanuc, or similar legacy VME specialist)
Product Type
VMEbus High-Density Digital I/O Module
Form Factor
6U Single-Slot VME Card
Bus Interface
VMEbus (A32/D32, A24/D16, etc., as per VME standard)
Digital Input Channels
High count (e.g., 32, 64, or 96 channels), typically grouped in banks
Input Type
Sinking or Sourcing, 24V DC nominal (or other voltage as specified by suffix), with optical isolation
Input Voltage Range
Typically 10-30V DC for “1” state, 0-5V DC for “0” state
Input Current
Typically 3-10 mA per point
Digital Output Channels
High count (e.g., 32, 64), complementary to inputs or as a separate version
Output Type
Solid-state (FET) or relay outputs, 24V DC / 0.5A per point (typical for solid-state), isolated
Isolation
Channel-to-channel and channel-to-bus isolation (typically 500-1500Vrms)
Response Time
Fast, typically < 1ms for inputs, < 1ms for outputs
Connector(s)
High-density D-Sub (e.g., 50-pin, 68-pin) or screw terminal front-panel connectors
Power Consumption
Derived from VMEbus +5V and +/-12V supplies; typical 2-5A on +5V rail
Operating Temperature
0°C to +60°C (commercial) or -40°C to +85°C (extended/ruggedized)
Key Features and Advantages
The VME7865RC V7865-23003 is distinguished by its high channel density and deterministic performance. By packing a large number of I/O points onto a single card, it maximizes the utility of each VME slot, which is crucial in space-constrained embedded systems. More importantly, its operation is tightly synchronized with the VMEbus cycle, offering predictable, low-latency access to I/O states. This determinism is essential for real-time control loops, high-speed data acquisition, and synchronized machine control where timing jitter is unacceptable.
VMIVME-7807RC
Robust electrical isolation and noise immunity are fundamental to its design. Each I/O channel or bank is typically optically isolated from the VMEbus logic and from other channels. This isolation barrier protects the sensitive computer system from voltage transients, ground loops, and electrical noise commonly present in industrial environments (such as from motors, solenoids, and welding equipment). This ensures data integrity and system stability, preventing costly shutdowns or damage to the central controller. The module is built with industrial-grade components and conformal coating to withstand harsh conditions of temperature, humidity, and vibration.
Flexibility and ease of integration are key benefits. The module usually features software-configurable options per bank or channel group, allowing the user to define groups of channels as inputs or outputs, and in some cases, set voltage thresholds or sink/source configurations via onboard jumpers or software. This reduces the need for stocking multiple specialized cards. Clear status LEDs for each channel or bank provide immediate visual feedback for debugging. Its standard VMEbus interface ensures compatibility with a wide range of single-board computers (SBCs) and real-time operating systems (RTOS like VxWorks, QNX), supported by well-documented register maps and device drivers. For system integrators, the VME7865RC offers a reliable, high-performance, and compact solution for aggregating vast amounts of discrete I/O in a proven, ruggedized architecture.
Application Areas
The VME7865RC V7865-23003 finds its primary application in high-performance, real-time industrial control and data acquisition systems built on the VME platform. In industrial automation and machine control, it is used in complex manufacturing lines, robotic workcells, and material handling systems to interface with thousands of sensors (photoelectric, inductive) and actuators (valves, clutches, brakes), providing the high-speed, deterministic I/O handling required for synchronized operations.
Within automated test equipment (ATE) and semiconductor manufacturing, the module is employed in test racks for functional testing of electronic assemblies or controlling probers and handlers. Its precise timing and high channel count are ideal for applying stimulus and measuring responses. In military and aerospace simulation, it forms the I/O backbone of hardware-in-the-loop (HIL) test rigs and flight simulators, reading pilot control inputs and driving instrument panel displays and control surface actuators with minimal latency.
For physics research and particle accelerators, it is used in control systems for magnet power supplies, vacuum systems, and beam diagnostics, where reliability and noise immunity are critical. In energy and process control (e.g., for turbine control or SCADA systems), legacy VME systems utilizing cards like the VME7865RC provide robust and proven control for critical infrastructure. Essentially, it is deployed in any scenario requiring a large number of rugged, isolated digital I/O points with deterministic behavior within a VME-based architecture.
Related Products
VME7865RC with different suffix (e.g., V7865-23001, -23005): Other variants in the same family with different I/O mixes (e.g., all-input, all-output, different voltage ratings like 48V DC or 120V AC).
VME Analog I/O Cards (e.g., VME-AIO-16/16): Companion modules for analog signal acquisition and generation in the same VME chassis.
VME Single Board Computer (SBC) (e.g., Motorola MVME162, Force CPCI-680): The host processor board that runs the application software and communicates with the VME7865RC over the backplane.
VME Chassis and Backplane: The enclosure and interconnect system that houses and powers the SBC, VME7865RC, and other cards.
VME System Controller/Resource Manager: A module that provides system services like bus arbitration and timing.
Breakout Panels / Terminal Panels: Custom-designed panels with terminal blocks or connectors that simplify field wiring to the dense D-Sub connectors on the VME7865RC front panel.
Real-Time Operating System (RTOS) and Device Drivers: Software such as VxWorks, QNX, or Linux with RT patches, along with the specific driver for the VME7865RC card.
Optical Isolation Modules (external): Additional isolation barriers sometimes used in series for ultra-high voltage or noise environments, though the card typically has built-in isolation.
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