VMIVME 2540-300 | GE 24-Channel Intelligent Counter Controller VMEbus Module

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Overview

The VMIVME 2540-300 is a rugged 6U VMEbus intelligent counter controller (ICC), originally developed by VMIC / GE Intelligent Platforms, now widely used for legacy high-precision timing, pulse counting, quadrature position measurement and pulse waveform generation in mission-critical VME-based systems.

As a VMEbus slave I/O board, the VMIVME 2540-300 features an on-board 15 MHz 68HC000 processor with 32-bit floating-point arithmetic support. It adopts memory-mapped interface design, delivering low-latency measurement and signal generation without heavy host CPU load. This module is designed for industrial and aerospace test systems; although it is end-of-life (EOL), original refurbished and surplus units are still supplied for system maintenance, replacement and spare part upgrade projects.

With 24 configurable measurement and control channels, it supports RS-422 differential signals and single-ended TTL inputs. It can perform frequency measurement, period & pulse width capture, quadrature encoder position reading, and programmable pulse sequence output. It is a preferred spare board for hardware-in-the-loop simulation, motion control, and automated test benches built on VME chassis.

Core Features

• 24 Multifunctional Channels: Configurable for counter input, timer capture, quadrature encoder reading, or pulse output; available channel grouping options: 4 / 8 / 16 / 24 channels
• On-board Local CPU: 15 MHz 68HC000 processor with IEEE 754 32-bit floating-point calculation, offloads timing tasks from VME host CPU
• Quadrature Position Measurement: Supports sin/cos encoder signals up to 1 MHz, 32-bit counter with limit and modulo checking for high-precision motion positioning
• Precision Measurement Functions: Frequency, period, pulse width measurement. Pulse width capture range from 400ns up to 8.5899×10⁶ seconds in floating-point mode
• Pulse & Waveform Generation: Square wave / pulse train output from 0.0076 Hz to 2.5 MHz, programmable duty cycle and pulse quantity
• VMEbus Slave Interface: A32/A24 / D32/D16/D8 compatible, 64KB VME memory window, supports VME interrupt IRQ1~IRQ7
• Dual Signal Interface: RS-422 differential for high noise immunity, also compatible with single-ended TTL signals
• Rugged Industrial Construction: 6U VME form factor, shock and vibration resistant, designed for long-term continuous operation in harsh test & control environments

Technical Specifications

表格

Working Principle

The VMIVME 2540-300 is an intelligent peripheral board instead of a simple passive I/O card. Its local 68HC000 CPU handles all timing and counting tasks locally, then transfers measurement results to the VME host via memory mapping.

When connected to encoders, pulse sensors or trigger signals, each channel independently captures edge events, counts pulses or measures time intervals. For motion control applications, it generates programmable pulse sequences for actuator drive. All measurement data is buffered on-board, minimizing VME bus traffic and reducing host CPU overhead.

The board supports continuous measurement mode and event-triggered VME interrupt. It can automatically trigger interrupts after a programmable time delay, which is widely used for synchronized multi-channel data acquisition in test systems.

Application Fields

• Hardware-in-the-Loop (HIL) Simulation: Aerospace and defense simulation platforms, real-time motion simulation
• Automated Test Equipment (ATE): High-speed pulse signal measurement, encoder test, sensor calibration benches
• Industrial Motion Control: Rotary machinery speed monitoring, positioning control, pulse sequence driving
• Power & Energy Test Systems: Generator and turbine pulse monitoring, frequency measurement for rotating equipment
• Aerospace & Defense Test: VME-based legacy test racks, ground test equipment and signal validation
• Transportation Test Bench: Motor speed and position measurement for rail, vehicle and propulsion systems

Product Advantages

1. Local intelligence offloads host CPU: Onboard processor executes all timing and counting tasks, greatly lowering real-time host load.
2. High noise immunity: RS-422 differential inputs maintain stable pulse capture in high EMI industrial environments.
3. Multi-function integration: One single VME board combines counter, timer, quadrature encoder readout and pulse generator, saving VME chassis slots.
4. Legacy system compatibility: Fully compatible with classic VMEbus architecture, perfect for replacement of failed original VMIC / GE boards without redesigning the whole control system.
5. Low latency measurement: Memory-mapped interface delivers fast data access and low transport lag for time-sensitive measurement tasks.

Package & After-Sales

Each VMIVME 2540-300 module is fully tested before shipment, packed with anti-static shielding and shockproof foam for international shipping. We supply tested refurbished and surplus units, with 12-month warranty. Our technical team can assist with compatibility check, pin definition review and spare part replacement consultation for your VME system. Global shipping available.

FAQ

Q1: Is VMIVME 2540-300 still in production?

A: The original manufacturing has been discontinued (EOL). We supply fully tested refurbished and surplus spare units for maintenance and replacement of existing VME systems.

Q2: What VME chassis does this board fit into?

A: Standard 6U VME chassis, compatible with VMEbus Rev. C.1 backplanes.

Q3: Can it read quadrature encoder signals?

A: Yes. It supports sin/cos quadrature encoder input up to 1 MHz, with 32-bit counter and limit checking for position control.

Q4: What accessory is recommended for signal breakout?

A: VMIACC-BT04 transition panel is commonly used to break out all front-panel signals to terminal blocks for easy wiring.

GE BRAND

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Supplies industrial spare parts covering well‑known international brands: ABB, GE, Bently Nevada, Emerson, Honeywell, Schneider, EPRO, Yokogawa, Woodward, Foxboro and Invensys TRICONEX.

We maintain ample stock, offer fast lead times and deliver products with stable, reliable quality.

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