VMIC VME-2128 High Voltage Digital Output Board

Module Feature

VME-2128 (VMIVME-2128) is a single-slot 6U VMEbus high-density high-voltage digital sink output board developed by VMIC (GE Fanuc / Abaco Systems). It provides 128 independent open-collector output channels for driving relays, solenoids, contactors and inductive field loads. Each channel supports 5–48 VDC load voltage, single channel sink current up to 600 mA, breakdown voltage 55 V. Onboard clamp diodes absorb inductive flyback voltage for load protection. VME bus interface supports A16/A24 addressing and D08/D16/D32 data transfer, works exclusively as VME slave. Built-in BIT logic supports software-controlled channel status readback and fault detection; front panel FAIL LED indicates module fault. Optional pull-up resistor sockets can be installed according to field wiring requirements. Integrated automatic surge shutdown and thermal shutdown protection prevent permanent hardware damage under overload or over-temperature condition. Compatible with VMIC intelligent I/O controller series. Rugged Eurocard PCB with conformal coating,shock and vibration screened for power plant cabinet environment,widely used in gas/steam turbine sequence control,automated test bench,aerospace control and legacy VME industrial chassis.

Working principle

VME host writes digital logic states to the onboard register array. The register outputs drive open-collector sink transistors to pull down field load signals. When driving inductive loads, clamp diodes suppress reverse electromotive force. BIT circuit can set test patterns and read back actual output state to verify channel integrity. VME FPGA performs address decoding and bidirectional data handshake between VME bus and output register bank. Thermal and surge protection circuits monitor power and load current and shut down drivers when thresholds are exceeded.

Onboard components

VME interface FPGA,128 channel open-collector driver array,inductive flyback clamp diode network,BIT status readback register bank,thermal protection circuit,surge current shutdown logic,optional pull-up resistor sockets,VME J1/J2 edge connector,front-panel P3/P4 multi-pin I/O connector,multi-status LED array.

LED indicators

Front panel LED indicators for board +5 V power,module FAIL fault alarm.

Hardware self-diagnosis

Visual inspection of PCB,components and solder joints;board ID register readback verification;BIT channel pattern write-readback test;over-temperature protection trigger test;VME A16/A24 read/write communication test.

Programming software

VMIC intelligent I/O driver library and configuration utility,supports VxWorks,Linux and QNX real-time operating systems;software tool for output bit setting and fault log reading.

Electrical & Process Parameters

Model: VME-2128 Brand: VMIC Device type: 6U VMEbus 128 channel high voltage digital sink output module Bus standard: VMEbus, A16/A24 addressing, D08/D16/D32 transfer Channel count:128 Output type: Open collector sink Load voltage:5–48 VDC,max breakdown 55 V Per channel current:600 mA sink typical Control mode: VME slave access,output status readback,BIT built-in self-test,surge & thermal shutdown,inductive flyback protection Power supply: +5 V from VME backplane Power consumption: 2.31 A typical @ +5 V Cooling: Forced air cooling Protection: Thermal shutdown,surge current cutoff,inductive flyback clamping,ESD protection Mounting: Standard single-height 6U VME front panel ejector locking Protection class: PCB with optional conformal coating

Mechanical & Structure

Mounting: Single-slot 6U VME Eurocard Protection class: PCB with optional conformal coating

Environmental

Operating temperature:0℃ ~ +55℃ Storage temperature:-20℃ ~ +85℃ Ambient humidity:20~80% non-condensing Certification: CE compliant Status: VMIC 6U VME high-density high voltage digital output board

Installation

Follow ESD safety procedure before handling.Fully power off VME chassis.Insert VME-2128 into vacant 6U VME slot and lock front panel ejector latches.Install optional pull-up resistors if required.Wire field relays and solenoid loads to front P3/P4 connector.Power on chassis,load VMIC I/O driver,run BIT channel diagnostic before commissioning.

Interface

VME J1/J2 backplane connector,front-panel P3/P4 multi-pin field I/O connector,fault status register pins.

Diagnostic

Board undetected: poor VME backplane contact,damaged edge connector or incorrect base address jumper setting. Individual channel no output: open field wiring or damaged output transistor. Front FAIL LED lit: over-temperature,overcurrent surge or BIT channel mismatch. Output damaged after load switching: missing flyback clamp or incorrect field voltage.

Product Brief

VMIC VME-2128 single height 6U VME high-density digital output board,128 channel open-collector sink output,5–48 VDC high voltage load capability with 600mA per channel,built-in BIT and thermal/surge protection,for relay and solenoid driving in turbine sequence control and test VME systems.