Description
XYCOM XVME-2121 – VME I/O Module for Reliable Machine and Process Control
The XYCOM XVME-2121 is a VMEbus I/O board used in legacy and current industrial systems where dependable, deterministic digital control still matters. From my experience, it’s typically chosen to extend digital I/O capacity in assembly lines, test stands, and motion cells that already run a VME chassis. You might notice that it slides right into a 6U VME backplane and “just works” with common VME CPUs, which is a big win when uptime is the priority.
Users keep it in service because it’s stable, straightforward to wire, and easy to diagnose during maintenance windows. A maintenance engineer summed it up well: “We swapped it into a legacy VME chassis during a Saturday shutdown; addressing and interrupts were set in minutes, and the line was back up before lunch.”
Company’s Order Placement Process and Guarantees
- Warranty: 365 days
- Delivery time: 1 week for in-stock items; no more than one month at the latest
- Payment: 50% advance payment; full payment before delivery
- Express delivery: FedEx, UPS, DHL
Key Features
- VMEbus compatibility – Fits a standard 6U VME system, typically recognized by mainstream VME CPU boards without drama.
- Deterministic digital I/O – Designed for machine control, interlocks, and sequencer signals where timing and repeatability matter.
- Flexible addressing and interrupts – Standard VME addressing and IRQ options for straightforward integration with existing firmware.
- Industrial build – Robust PCB and component selection suitable for cabinet environments in most factory settings.
- Service-friendly – Front extraction handle, clear labeling, and field-wiring options that make troubleshooting faster.
Technical Specifications
| Brand / Model | XYCOM XVME-2121 |
| HS Code | 8537.10 (Boards/panels for electric control, ≤1000 V) |
| Power Requirements | Supplied via VME backplane; typically +5 VDC (consumption varies by I/O population) |
| Dimensions & Weight | 6U VME (approx. 233.35 mm × 160 mm); ~0.6 kg typical |
| Operating Temperature | 0 to +55 °C (typical cabinet conditions) |
| Signal I/O Types | Digital I/O; commonly TTL-level and/or opto-isolated variants depending on build; wiring via front header or backplane transition (varies by option) |
| Communication Interfaces | VMEbus; typically A16/A24 addressing, D8/D16 data width; IRQ support |
| Installation Method | 6U VME card; inserts into P1 (and P2 if used); secured with front-panel handle and captive screws |
Note: Channel counts and exact I/O population can vary by XVME-2121 option codes and revision. If you share your installed base or wiring plan, we can verify compatibility before shipment.
Related or Supporting Products
- Motorola MVME-162 / MVME-172 – VME CPU boards commonly paired as controllers; stable choice for legacy systems.
- Artesyn/Emerson MVME-5100 – Higher-performance VME CPU when more processing headroom is needed.
- Acromag AVME-9660 – 96-channel TTL digital I/O VME board; practical alternative when higher density is preferred.
- Schroff 6U VME subrack (EuropacPRO series) – For clean installation, cooling, and EMC in control cabinets.
- DIN-rail terminal breakout panels – Eases field wiring from ribbon/transition connections to discrete sensors and actuators.
If you’re upgrading an existing rack, we can help match addressing, interrupt levels, and transition modules so you don’t need to touch application code.
Installation & Maintenance
- Cabinet & chassis – Install in a 6U VME subrack with adequate airflow; keep ambient within 0–55 °C. Maintain spacing for convection or use forced air.
- Power & grounding – Use a stable VME power supply. Bond chassis ground properly to reduce noise on digital lines.
- Address/IRQ setup – Set DIP switches or jumpers for base address and interrupt level. Label the settings inside the door; it saves time later.
- Wiring – Use the recommended ribbon/terminal breakout; separate high-inductive loads from logic lines and include suppression (flyback diodes) where needed.
- Safety – De-energize the rack before insertion or removal. Observe ESD precautions when handling the board.
- Routine checks – Quarterly visual inspection for connector wear and dust; clean with dry air. Verify I/O mapping at boot and keep backup of configuration notes.
- Firmware/compatibility – In most cases the board is firmware-agnostic; still, confirm OS/driver expectations with your VME CPU to avoid IRQ conflicts.
Quality & Certifications
- Certifications – CE marking commonly found on later revisions; UL/CSA varies by production batch; RoHS compliance may not apply to early legacy builds.
- Manufacturer’s warranty – The product is supported with a 365-day warranty through our channel.
- Functional testing – Units are typically inspected and electrically tested before dispatch to reduce installation risk.
If you can share your slot map and I/O list, we’ll cross-check the XVME-2121 optioning and ship a configuration that drops into your rack with minimal changes.
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