GE VMIVME-7740-840 VME SBC Unit

Module Feature

VMIVME-7740-840 is GE VMIC VMIVME-7740 series 6U VMEbus single board computer.

It adopts Intel Pentium III processor architecture, standard VME64 backplane bus interface, equipped with onboard SDRAM memory, IDE storage interface and one PMC expansion slot for custom auxiliary card expansion. Front panel carries Ethernet, RS232 serial service port and reset button. It boots VxWorks real-time operating system by default, works as host CPU or gateway board in legacy GE turbine and industrial control rack. Heavy-duty vibration resistant 6U Eurocard construction, suitable for long-term continuous operation in power plant control cabinet. It is a hard-to-source legacy spare for old Speedtronic control system maintenance.

Working principle

The onboard CPU runs real-time operating system and control application.

It communicates with other VME I/O boards through VME64 backplane bus to read field data and issue control commands. It exchanges diagnostic, HMI and host communication data via Ethernet port. PMC slot can be fitted with custom communication or acquisition daughter board to expand special signal interfaces. System firmware and application program are stored in onboard non-volatile memory.

Onboard components

Pentium III CPU, SDRAM memory bank, VME bridge controller, IDE storage controller, Ethernet transceiver, UART serial circuit, PMC expansion connector, status LED array, reset switch, 6U metal front panel and PCB assembly.

LED indicators

Front LEDs indicate power status, CPU heartbeat, VME bus activity, Ethernet link and fault status.

Hardware self‑diagnosis

Built-in POST power-on self-test, memory and bus supervision. Fault information can be checked via serial console or host diagnostic software.

Programming software

VxWorks development tool, BIOS setup utility, GE control system configuration software.

Electrical & Process Parameters

Model:VMIVME-7740-840 Brand:GE / VMIC Device type:6U VMEbus single board computer Function:Real-time computation, backplane bus master control and network communication for legacy turbine control rack

Mechanical & Structure

Mounting:6U VME chassis slot plug-in installation Protection class:IP20 Housing:6U Eurocard industrial PCB with metal front panel

Environmental

Operating temperature:0℃ ~ +70℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing

Certification:CE Status:Original legacy GE control spare

InstallationPower off chassis before replacement. Check jumper and BIOS configuration after installation, match VME backplane address setting, test network and PMC expansion function before loading application.

Interface

VME64 backplane edge connector, RJ45 Ethernet port, RS232 service serial port, PMC expansion site, front panel reset switch.

Diagnostic

No boot: Power supply abnormal, memory failure or BIOS corruption. VME bus communication fail: Backplane conflict, address jumper wrong or bridge chip damage. Ethernet offline: PHY circuit fault or network configuration mismatch.

Product Brief

GE VMIVME-7740-840 single board computer, VME64 6U CPU spare for legacy GE turbine control rack replacement.