VMIC VMIVME-2170A Optically Isolated Digital Output Board

Module Feature

VMIVME-2170A is a double-height 6U VMEbus optically isolated digital output board developed by VMIC (GE Fanuc / Abaco Systems). It provides 32 independent opto-coupled digital output channels,divided into four groups of 8-bit registers. Each channel supports two output current options: low-current 2.5 mA or high drive 300 mA,configurable as source or sink type open-collector output. Field pull-up resistors can be soldered or removed on PCB to match different external logic voltage;external pull-up voltage range up to 30 V DC. Optical isolation separates VME bus logic side and field output side,withstand 1000 V continuous isolation voltage and 6000 V pulsed voltage,channel-to-channel continuous isolation rating 500 V to suppress ground loop and heavy industrial EMI interference. The board supports 8-bit and 16-bit VME data transfers,users can choose supervisory or nonprivileged short I/O transfer mode via onboard jumper. 14-bit DIP switch sets base board address on VME short I/O space,access time max 250 ns. Output logic polarity can be selected as positive true or negative true. Front panel equipped with group status LED for channel bank indication. Built-in BIT loopback self-test verifies register write and optocoupler function without external wiring. Rugged Eurocard PCB with conformal coating,shock and vibration screened for power plant cabinet environment,widely used in gas/steam turbine relay and solenoid actuator control,aerospace ground test bench and hardware-in-loop real-time simulation VME chassis.

Working principle

VME host writes digital state data to four 8-bit output registers on VMIVME-2170A. Register data drives optocoupler input LED;when LED turns on,the field-side transistor conducts to activate the open-collector output. External pull-up power supply provides field output voltage,fully separated from VME backplane +5 V logic power. BIT mode writes test patterns to output registers and internally routes optocoupler state back to read registers to validate each channel operation. VME FPGA completes address decoding and data handshake between VME backplane and output register bank. Optocoupler blocks common-mode surge and ground potential difference between VME control rack and field equipment.

Onboard components

VME interface FPGA,four 8-bit output register banks,32-channel optocoupler array,output current selection circuit,polarity control logic,14-bit DIP address switch,pull-up resistor pads,BIT loopback test hardware,VME J1/J2 edge connector,front-panel multi-pin DIN output connector and group status LED.

LED indicators

Front panel LED indicators for output bank status and module fault alarm.

Hardware self-diagnosis

Visual inspection of PCB,components and solder joints;board ID register readback verification;BIT loopback pattern write-read test for all 32 channels;VME A16 short I/O register communication validation.

Programming software

VMIC digital output driver library and configuration utility,supports VxWorks,Linux and QNX real-time operating systems;software tool for channel state writing,output polarity setup and BIT fault log reading.

Electrical & Process Parameters

Model: VMIVME-2170A Brand: VMIC Device type: Double height 6U VMEbus 32 channel optically isolated digital output module Bus standard: VMEbus, A16 short I/O addressing, D08/D16 data transfer Channel:32 opto-isolated digital output channels,4 × 8-bit register groups Output type: Open collector,source / sink selectable Output current:2.5 mA low current or 300 mA high drive per channel External field voltage:5 ~30 V DC Isolation rating:1000 V continuous field-to-VME,6000 V pulse;500 V channel-to-channel Control mode: VME slave access,14-bit DIP address setting,positive/negative true selectable,external pull-up configuration,BIT loopback self-test,optical isolation anti-interference Power supply: +5 V from VME backplane Cooling: Convection cooling Protection: Optocoupler surge isolation,open-collector overcurrent limiting Mounting: Standard double-height 6U VME front panel ejector locking Protection class: PCB with optional conformal coating

Mechanical & Structure

Mounting: Double-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 double height 6U VME 32-channel optically isolated digital output board

Installation

Follow ESD safety procedure before handling.Fully power off VME chassis.Insert VMIVME-2170A into vacant double-height 6U VME slot and lock front panel ejector latches.Set DIP switches for board base address,configure jumper for supervisory/nonprivileged transfer and output polarity.Install or remove pull-up resistors according to field wiring requirement.Connect field solenoid/relay wiring to front DIN connector and supply external pull-up voltage.Power on chassis,load VMIC digital I/O driver,run BIT loopback diagnostic before commissioning.

Interface

VME J1/J2 backplane connector,front-panel multi-pin DIN isolated digital output connector,status and fault register pins.

Diagnostic

Board undetected: poor VME backplane contact,damaged edge connector or incorrect DIP address setting. BIT channel test failure: optocoupler burnout or register write/read fault. No field output: missing external pull-up supply or DIN terminal loose connection. Channel cross-talk: insufficient isolation or unshielded field wiring.

Product Brief

VMIC VMIVME-2170A double height 6U VME optically isolated digital output board,32 open-collector opto-isolated channels with 2.5mA/300mA current selection and high 1kV isolation rating,built-in BIT loopback test,provides robust isolated drive interface for turbine solenoid/relay control and aerospace hardware-in-loop simulation VME systems.