Product Details

The XYCOM XVME-203, PN 74203-001, is a discontinued single-height 3U VMEbus counter module with quadrature decoding function, designed for XYCOM legacy VME control racks and motion measurement systems. This board adopts dual AM9513A timer/counter chips, offering 10 independent 16-bit counting channels and supporting up to 4 incremental encoder inputs with quadrature decoding. It supports single pulse, dual pulse and AB quadrature counting modes, with a maximum input frequency of 5MHz and 20MHz equivalent rate under 4x quadrature multiplication, which can precisely capture position, speed and displacement signals from rotary encoders. It also comes with 8 programmable output channels for pulse generation, frequency division and trigger signal output, and integrates AM9519A interrupt controller to support multi-level VME interrupts. It acts as a dedicated encoder and pulse signal interface between the VME master CPU and field encoders, proximity sensors and motion actuators, delivering high-precision position feedback for closed-loop motion control. The board follows standard VMEbus slave protocol, and users can configure base address, interrupt vector, counting mode and output logic via on-board jumpers and DIP switches to avoid resource conflicts with other VME modules in the same chassis. The I/O signals are connected through a 50-pin flat ribbon connector on the front panel. Built-in signal conditioning, noise filtering and transient suppression circuits reduce electromagnetic interference from inverters and servo drives, ensuring stable pulse sampling in noisy factory environments. The front edge is equipped with LED indicators for power status, bus access and channel activity, helping maintenance technicians quickly diagnose wiring faults, signal loss and bus communication anomalies during commissioning and routine inspection. The PCB adopts industrial-grade electronic components and reliable EMC protection design, capable of resisting vibration, dust and temperature fluctuation in machining workshops and test measurement stations. This legacy quadrature counter module is mainly supplied as spare replacement parts for existing XYCOM VME automation systems. Users need to confirm VME chassis compatibility, bus address allocation and encoder signal wiring requirements before installation. A conformal coated version is optional for high humidity, dusty industrial sites. This model is widely used in CNC axis positioning, packaging machine motion control, material handling systems and old VME-based motion measurement retrofit projects.

This quadrature counter module adopts standard 3U single-height VME rack mount structure. It draws power from the VME backplane. LED indicators display power status, bus activity and channel signal status for convenient on-site inspection. The operating temperature range is 0°C to 50°C, storage temperature ranges from -40°C to 85°C, relative humidity 5% to 95% non-condensing. It complies with industrial shock, vibration and EMC standards and has CE certifications. It supports counting mode and interrupt configuration backup for fast recovery after hardware replacement.

This XYCOM XVME-203 quadrature counter module is widely applied in legacy VME control racks and industrial motion control upgrade projects. It provides high-precision encoder pulse acquisition and position measurement for the VME master control system. As a reliable discontinued spare part, the XYCOM XVME-203 retains original VME bus timing and signal compatibility, and effectively reduces the renovation cost of legacy industrial control system maintenance.