VMIC VMIVME-4116 Analog Output DAC Board

Module Feature

VMIVME-4116 is a single-slot 6U VMEbus high precision digital-to-analog converter board developed by VMIC (GE Fanuc / Abaco Systems). It integrates eight independent 16-bit DAC channels,each channel equipped with dedicated DAC chip and double-buffered data latch structure. Analog output range is ±10 V buffered voltage,maximum output current 5 mA,settling time within 10 µs to reach ±0.003% of full scale range,1 LSB resolution 305 µV. It supports offset binary or two’s complement digital coding format. Synchronized update control can be configured via onboard jumpers,users can choose software strobe or external hardware trigger to refresh all DAC outputs simultaneously. The board supports VMIC AMXbus analog expansion and BIT bus,can interconnect with matched VMIC ADC boards for closed-loop self-test. Front panel fitted with fault indicator LED and high-reliability DIN type output connector. When power-up,all analog outputs reset to 0.0 V and automatically disconnect field wiring to protect downstream equipment. Rugged Eurocard PCB with conformal coating,shock and vibration screened for power plant cabinet environment,widely used in gas/steam turbine analog actuator control,aerospace ground test bench and hardware-in-loop real-time simulation VME chassis.

Working principle

VME host writes 16-bit digital value into the double-buffered latch of each DAC channel through VME bus. Data is stored in first-stage buffer temporarily and will not update analog output immediately until receiving software strobe or external hardware trigger signal. After trigger arrives,data transfers to DAC conversion register,converts digital signal to stable ±10 V analog voltage and outputs through buffer circuit. AMXbus multiplexes analog signals to cooperate with matched ADC board to realize BIT closed-loop test,verifying conversion accuracy of each DAC channel. VME FPGA completes address decoding and bidirectional register read/write handshake between VME backplane and control status register. Onboard surge suppression circuit protects analog output ports from transient interference of field cables.

Onboard components

VME interface FPGA,eight independent 16-bit DAC chips,double-buffered data latch array,control & status register,AMXbus analog multiplexer circuit,synchronized update logic,BIT test circuit,VME J1/J2 edge connector,front-panel DIN analog output connector and fault LED.

LED indicators

Front panel LED indicators for module fault alarm.

Hardware self-diagnosis

Visual inspection of PCB,components and solder joints;board ID register readback verification;per-channel DAC output accuracy test via AMXbus closed loop;VME A16 read/write communication validation.

Programming software

VMIC analog I/O driver library and configuration utility,supports VxWorks,Linux and QNX real-time operating systems;software tool for DAC channel value writing,sync trigger configuration and BIT error log reading.

Electrical & Process Parameters

Model: VMIVME-4116 Brand: VMIC Device type: 6U VMEbus 8 channel 16 bit analog output DAC module Bus standard: VMEbus, A16 short addressing, D08/D16/D32 data transfer Channel:8 independent analog output channels,16-bit resolution Output range:±10 V DC buffered voltage,max 5 mA per channel Settling time:10 µs max to ±0.003 % FSR Data format:Offset binary / two’s complement selectable Control mode: VME slave access,double-buffered latch,sync update via software/external trigger,AMXbus BIT closed-loop test,output power-up protection Power supply: +5 V, +12 V from VME backplane Cooling: Convection cooling Protection: Power-up output disconnect,transient surge clamping 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℃ ~ +70℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:20~80% non-condensing Certification: CE compliant Status: VMIC 6U VME 8 channel 16-bit high precision analog output DAC board

Installation

Follow ESD safety procedure before handling.Fully power off VME chassis.Insert VMIVME-4116 into vacant 6U VME slot and lock front panel ejector latches.Set onboard jumpers for sync update mode.Connect field analog actuator wiring to front DIN connector.Power on chassis,load VMIC analog I/O driver,run BIT closed-loop diagnostic before commissioning.

Interface

VME J1/J2 backplane connector,front-panel DIN analog output connector,AMXbus P2 interconnection pins,fault status register pins.

Diagnostic

Board undetected: poor VME backplane contact,damaged edge connector or incorrect A16 address setting. DAC output deviation: reference voltage drift or AMXbus BIT circuit abnormality. Channel no analog output: latch register fault or DIN connector pin poor contact. Fault LED lit: overrange output or internal power rail abnormality.

Product Brief

VMIC VMIVME-4116 single height 6U VME analog output DAC board,eight 16-bit high-precision ±10 V analog channels with double-buffered synchronous update and AMXbus BIT closed-loop test,provides high accuracy analog control interface for turbine actuator regulation and aerospace hardware-in-loop simulation VME systems.