VMIC VMIVME-4120 Analog Output Board

Module Feature

VMIC VMIVME-4120 is a standard single-slot 6U VMEbus analog output board with 16 independent 12-bit digital-to-analog converter channels. Each channel can be hardware configured via on-board jumpers for voltage output or current transmitter loop output. Voltage ranges include 0~+5 V, 0~+10 V, ±2.5 V, ±5 V, ±10 V; current modes support 0~20 mA, 4~20 mA and 5~25 mA. It integrates an isolated DC-DC converter for analog power supply, or supports external analog power input. Front panel P3 connector brings out all analog field signals for convenient wiring. Onboard register and status logic supports VME A16/A24 addressing, with built-in channel fault detection and over-range protection. Rugged Eurocard construction with conformal coating option, widely used for valve control, actuator drive, pressure/flow closed-loop regulation in turbine control, semiconductor manufacturing and industrial test systems.

Working principle

VMEbus master writes digital setpoint data to each channel register of VMIVME-4120. The onboard DAC chip converts digital values into analog signals, then passes through signal conditioning and isolation circuit to generate final voltage or 4-20mA current loop signals for field actuators. Hardware jumpers select output type and range for each channel independently. VME interface logic handles address decoding, data handshake and status register feedback, allowing host CPU to read channel fault and over-range flags. Isolated power suppresses ground loop interference between chassis backplane and field sensor wiring.

Onboard components

12-bit DAC array, analog signal conditioning amplifier, DC-DC isolated power converter, VME address decode FPGA, channel status register, front panel P3 analog terminal block, configuration jumpers, status LED array.

LED indicators

Front panel LED indicators for board power, VME bus access, channel over-range fault and analog power ready.

Hardware self-diagnosis

Visual inspection of PCB, front panel connector and solder joints; board ID register readback test; DAC loopback calibration test for every channel; full-scale and zero offset verification; VME read/write communication test; over-range protection trigger test.

Programming software

VMIC VME device driver library, channel range configuration and calibration utility, compatible with VxWorks, Linux and Windows embedded real-time operating systems.

Electrical & Process Parameters

Model: VMIVME-4120 Device type: 6U VMEbus multi-channel analog output module Bus standard: VMEbus, A16/A24 addressing Resolution: 12 bit Channel count: 16 independent D/A channels Signal mode: Jumper selectable voltage or current loop Power supply: +5 V from VME backplane; onboard isolated DC-DC for analog circuit Cooling: Convection cooling Protection: Over voltage, over current, ESD protection, over-range alarm Mounting: Standard 6U VME front panel ejector locking Protection class: Conformal coating optional

Mechanical & Structure

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

Environmental

Operating temperature: 0℃ ~ +60℃ Storage temperature: -40℃ ~ +85℃ Ambient humidity: 5~95% non-condensing Certification: CE compliant Status: VMIC 16 channel 12 bit VME analog output board

Installation

Follow ESD safety procedure before handling. Fully power off VME chassis. Insert VMIVME-4120 into vacant 6U VME slot and lock front panel ejector latches. Set on-board jumpers for each channel voltage/current range according to field requirement. Wire field actuators to front panel P3 analog terminal connector. Power on chassis, load VMIC driver, run channel calibration and loopback test before commissioning.

Interface

VME J1/J2 backplane connector, front panel P3 multi-channel analog output terminal, fault status signal pins.

Diagnostic

Board not recognized: poor VME backplane contact, damaged edge connector, backplane power abnormality. Channel output offset drift: calibration aging, ground loop noise, signal conditioning circuit drift. No analog output: over-range protection triggered, broken field wiring, DAC hardware failure. VME write access timeout: incorrect address jumper setting, bus termination error.

Product Brief

VMIVME-4120 VMIC 6U VME analog output board,16 channel 12-bit DAC,jumper configurable voltage and 4-20mA current loop,for industrial closed-loop process control,valve actuation and semiconductor equipment measurement systems.