Abaco Systems / VMIC VMIVME-2128-011 128-bit High-Voltage Digital Output Board with Built-In-Test

The Abaco Systems / VMIC VMIVME-2128-011 is a 128-bit high-voltage digital output board for VMEbus systems. It delivers 128 channels of high-voltage and high-current sink outputs using open collector drivers rated for 5 to 48 VDC operation. Each channel sinks up to 600 mA, with a 55 V breakdown voltage rating.

Built-in-Test logic enables software-controlled verification of individual channel functionality. The board integrates automatic surge current shutdown, thermal shutdown protection, and output clamp diodes for inductive flyback suppression.

Technical Specifications

• 128 output channels


• Output voltage range: 5 to 48 VDC (I/O range: 5 to 55 VDC)


• Maximum breakdown voltage: 55 V


• Current sink capability: 600 mA per channel


• Open collector output drivers


• Data transfer support: 8, 16, 32-bit operations


• VMEbus compliance: ANSI/IEEE STD 1014-1987, IEC 821 and 297


• Form factor: 6U (A24:A16:D32/D16/D08 EO slave)


• High-voltage buffered front-panel I/O interface

Key Features

• Built-in-Test logic for per-channel software verification


• Automatic surge current shutdown protection


• Thermal shutdown protection


• Output clamp diodes for inductive load transient suppression


• Fail LED indicator on front panel


• Warming resistor sockets for user-supplied components


• Optional pull-up resistors for electronic switch outputs


• Eight 16-bit bi-directional dual-port latches with CSR control register


• High-speed DTACK generator for optimized data transfer rates

Typical Applications

• Industrial control and equipment automation


• Test and instrumentation systems requiring high-voltage digital switching


• Multi-channel relay and solenoid driver applications


• Flight test and telemetry systems

Compatibility & Integration VMEbus interface supports A24, A16, and D32/D16/D08 data transfers in short or standard I/O memory space with supervisory and non-privileged access modes. Compatible with Intelligent I/O Controllers. Address selection via A4, A3, A2, A1 bits and data strobes. The VME-2128A is a form, fit, and function replacement, entering Restricted Production Phase on September 30, 2025.