Abaco Systems / VMIC VMIVME-2540-200 Intelligent Counter/Controller

The Abaco Systems / VMIC VMIVME-2540-200 is an intelligent counter/controller VME board that delivers versatile counting, timing, and control capabilities for industrial measurement and automation systems. Built around an on-board 68HC000 microprocessor running at 15 MHz, this board simplifies integration through a command-driven interface that configures measurement, timing, and output functions. It supports up to 4 Giga Events of counting capacity across configurable channel counts of 4, 8, 16, or 24 I/O channels.

Technical Specifications

Event Counting & Frequency Measurement

• Up to 4 Giga Events counting capability


• Input frequency range: DC to 2.5 MHz


• Frequency measurement range: 0.0076 Hz to 2.5 MHz


• 16-bit counter accuracy: 0.015% maximum (0.007 to 76 Hz); percentage error = 100×(frequency/5 MHz) for 76 Hz to 2.5 MHz


• 16-bit enhanced-resolution counter: 0.001 Hz to 1.25 MHz


• Count range returned: up to 2^16 (word mode), up to 2^32 (long mode) Period & Pulse-Width Measurement


• 16-bit counter range: 131.07 s to 400 ns


• 16-bit enhanced-resolution counter: 858.9 s to 800 ns


• Accuracy: 0.015% maximum (131 s to 13.1 ms); percentage error = 100×(200 ns/period) for 13.1 ms to 200 ns


• 16-bit prescaler range: ÷2 to 65536 with 400 ns resolution Pulse Train Generation


• Pulse repetition rate: 0.0038 Hz to 2.5 MHz


• Period range: 262.1 s to 400 ns


• Pulse-width range: 131 s to 200 ns Timing Controllers


• Six AM9513A System Timing Controllers (STCs) with four counter/waveform synthesis interfaces each


• System time base: 5 MHz


• Accuracy/stability: ±0.005% Quadrature Position Measurement


• Sin/Cos input range: DC to 1 MHz


• Accuracy: ±1/4 wave at 5 MHz sample rate


• 32-bit counters with limit/modulo checking Discrete Outputs


• Up to 24 output channels, 12-bit resolution


• Source and sink: ±10 V at up to 10 mA per channel VMEbus Interface & On-Board CPU


• VMEbus slave interface supporting A32/A24/D32/D16/D08(EO)


• 64 Kbyte VMEbus memory window


• 68HC000 microprocessor at 15 MHz


• IEEE 754-1985 32-bit floating-point arithmetic; two's complement and unsigned integer modes

Key Features

• Six independent System Timing Controllers enable concurrent timing and counting operations


• Command-driven programming simplifies measurement configuration


• Flexible channel architecture scales from 4 to 24 discrete I/O channels


• Prescaler options extend low-frequency resolution and high-frequency range


• Integrated CPU eliminates external timing logic requirements

Typical Applications

• Industrial event and frequency counting


• Encoder position tracking and quadrature decoding


• Pulse generation and waveform synthesis


• High-resolution timing measurement


• Test equipment control and data acquisition

Compatibility & Integration VME-based systems requiring tightly integrated counting, timing, and discrete I/O functions. On-board CPU architecture permits standalone operation or VMEbus master/slave configurations.