GE VMIVME-3125 3U VMEbus Configurable Digital I/O Module

Description

The GE VMIVME-3125 operates at the analog input periphery of VME hierarchies, a 6U double-height board that multiplexes 32 single-ended or 16 differential channels through a 12-bit successive approximation ADC with track-and-hold, interfacing via the VME P1/P2 backplane for A24/D16 slave access from host SBCs at up to 1 MB/s transfers. It populates in slots 1-21 of standard crates, drawing +5 V system power for logic and ±15 V for analog sections, where automatic scanning cycles inputs at 40 kHz aggregate (1.25 kHz per channel max), applying programmable gains and offsets before storing data in on-board RAM accessible via dual-port registers for host reads without stalling the scan. In action, it captures overvoltage-protected signals (up to ±100 V transients) through low-pass filters, applies differential amplification for noise rejection, then outputs digitized values (0-4095 counts) with linearity under ±0.05% FSR, supporting self-test modes that inject references for calibration verification.

This board aligns with VME’s expandable architecture, combining with DAC siblings like the VMIVME-4116 for closed-loop control or PMC adapters for FPGA preprocessing, supporting diagnostics through LED status and register polls that flag mux faults or gain drifts in tools like VxWorks debuggers. The GE VMIVME-3125 thrives in forced-air-cooled enclosures, with jumper-selectable input modes (voltage/current) and its low crosstalk (<-80 dB) suiting multi-channel correlation in vibration profiling. Rated for 0°C to +70°C and 2g vibes, it implicitly aids protocols like VxWorks DMA for burst transfers, fitting hybrid VME/Ethernet setups via host bridges. By centralizing density yet buffered with isolation, it fluidizes the acquisition continuum—from steady-state polling to transient hunts—empowering engineers to sculpt insights with surgical grace rather than wrestle with waveform warts.