Description
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Product Introduction
When a legacy VMEbus DCS system’s main controller fails mid-operation and no replacement processing card is available, the root cause almost always traces back to obsolete commercial computing hardware that cannot withstand continuous high-vibration industrial operating conditions.
Purpose-built for GE VMIC VMEbus embedded control platforms, this 6U form factor single board computer uses fully ruggedized COTS (Commercial Off-The-Shelf) components that are qualified for extreme temperature, shock and vibration environments. It supports 16/24/32/64-bit dynamic VMEbus data transmission without relying on a fixed system clock, delivering fully asynchronous high-speed data exchange with all other VMEbus modules in the same rack. The onboard SCSI interface and dual RS232 serial ports provide native connectivity to legacy DCS operator stations and field devices, removing the requirement for extra adapter cards during system retrofit.
VMIVME-7740-850
VMIVME-7740-850
VMIVME-7740-850
VMIVME-7740-850
VMIVME-7740-850
Key Technical Specifications
| Parameter | Value |
|---|---|
| Product Model | VMIVME-7740-850, Part No. 350-007740-850 L |
| Compatible Platforms | GE VMIC VMEbus Industrial Control Systems, Legacy DCS Platforms |
| Processor | 1 GHz Intel Pentium III |
| Standard Memory | 256 MB SDRAM, expandable up to 512 MB |
| Onboard Storage | Integrated industrial Flash Disk, no moving mechanical parts |
| VMEbus Interface | 32-bit VMEbus master/slave, asynchronous multi-cycle data transfer |
| Data Bus Width | 8/16/24/32/64 bits dynamically selectable |
| Native Interfaces | SCSI, Dual RS232 Serial, 10/100Mbps Ethernet, PS/2 Keyboard/Mouse |
| Form Factor | 6U VMEbus standard, 96-pin P1/J1 + P2/J2 backplane connectors |
| Operating Temperature Range | -20°C to +70°C |
| Agency Approvals | CE, UL, industrial and defense ruggedized certified |
| Country of Origin | USA |
| Net Weight | ~0.7 kg |
| Typical Price Range | 650–2850 USD (new surplus) |
Field Application & Technical Pitfalls
This part runs three non-negotiable production-critical roles.
First, it acts as the main processing SBC for large thermal power plant legacy DCS control systems, executing real-time process control logic for boiler and turbine protection loops.
Second, it serves as the embedded computing unit for deployed military rugged VMEbus systems, delivering stable low-latency performance under high shock and vibration conditions.
Third, it functions as the retrofit replacement SBC for old VMIC VMEbus single board computers, restoring full system operation without requiring any major DCS software migration.
⚠️ Memory Configuration Mismatch Risk: The board only supports specific industrial-grade SDRAM modules. If you install a standard consumer desktop SDRAM stick, the system will fail to boot or experience random runtime crashes.
⚠️ VMEbus Backplane Connector Damage Risk: The 96-pin P1/J1 and P2/J2 backplane connectors are extremely fragile. If you force the board into the VME rack at an angle, you will bend the backplane pins and permanently damage the VMEbus communication path.
⚠️ SCSI Termination Mismatch: The onboard SCSI bus requires proper active termination at the last device on the chain. If you remove the SCSI terminator, you will trigger severe signal reflection that causes random SCSI device communication dropout.
I watched a senior DCS maintenance tech skip the SCSI termination check last winter. He swapped this VMIVME-7740-850 SBC into a thermal power plant DCS rack, accidentally removed the SCSI bus terminator, and the DCS operator station lost all historical data access randomly. The team spent 2 hours troubleshooting before they found the missing terminator issue. That 1-minute oversight forced the plant to run the DCS system without historical data logging for half a shift.
Quality Control (QC) SOP & Transparency
- Inbound Verification: Cross-check the OEM serial number against Abaco Systems / GE VMIC’s official VME SBC part revision database, run anti-counterfeit validation on the board’s laser-etched serial label, and confirm no bent pins or cracked solder joints on the VMEbus backplane connectors.
- Live Rig Testing: Mount the SBC in a certified 6U VMEbus test rack, boot the embedded industrial operating system, and verify 4 hours of stable continuous full-load CPU operation.
- Parameter Testing: Confirm 1GHz Pentium III full-load performance, verify VMEbus 32-bit master/slave communication zero packet loss, and validate SCSI, Ethernet and dual RS232 interfaces all function correctly.
- Final QA & Packaging: Seal the fully tested SBC in a static-shielding anti-static bag, apply a unique QC passed serial label, and pack it in ESD-dissipative foam with a printed hard copy of the full system boot and communication test report.
Frequently Asked Questions
- Can I hot-swap this SBC while the VMEbus rack is powered on? No. Standard VMEbus single board computers do not support certified hot-plug. Pulling the board live will instantly cut all real-time control logic execution, triggering unplanned process shutdown.
- What exact VMIC VMEbus systems does this part work with? It is fully compatible with GE VMIC legacy VMEbus embedded control platforms. It will not establish stable native communication with newer non-VMEbus CompactPCI or VPX industrial computing systems.
- How long is the standard warranty for this new surplus unit? It carries a full 12-month functional warranty. If it fails within that window under specified operating conditions, we cover all return shipping and bench replacement costs.
- How do I tell a genuine OEM unit apart from a refurbished clone? Genuine units have the GE VMIC hologram sticker on the side of the PCB, and the Pentium III CPU carries the official VMIC part number marking. Refurbished clones usually skip the official hologram and use generic non-ruggedized memory modules that cannot withstand the required industrial temperature range.
- Will this VMIVME-7740-850 directly replace an older VMIC VMEbus SBC? No. Older VMIC VME SBC variants may have different firmware versions. You will need to re-verify the VMEbus base address and interrupt configuration settings in the system BIOS after swapping.
- What’s the maximum safe continuous operating temperature at full 1GHz CPU load? It will hold stable computing performance up to 70°C, though your mileage may vary if the VME rack cooling airflow drops below 15 CFM and internal CPU temperatures spike 15°C above ambient.
