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.