Product Details

The XYCOM XVME-402 is a discontinued single-height 3U VMEbus Bitbus controller module, designed for XYCOM legacy VME control racks and distributed fieldbus I/O systems. It integrates the Intel i80C152 Bitbus protocol controller, acting as a dedicated bridge between the VMEbus host processor and remote Bitbus slave I/O nodes. This module handles full Bitbus protocol stack management, message framing, error checking and bus scheduling, allowing the VME master CPU to exchange commands and process data with a network of remote Bitbus I/O modules without heavy protocol overhead. The Bitbus physical layer supports twisted-pair wiring, delivering reliable communication for distributed industrial nodes over moderate cable distances, and supports multi-drop network topology to expand system I/O capacity efficiently. It complies with IEEE 1014 VMEbus standard and functions as a VME slave device, supporting A16/D08 bus cycles and configurable VME interrupts to notify the host when new messages arrive or bus faults occur. Users can set base address, interrupt vector and bus timing parameters via on-board jumpers and DIP switches to avoid resource conflicts with other VME modules installed in the same chassis. On-board transient suppression and noise filtering circuits protect the Bitbus transceiver against electrostatic discharge and electromagnetic interference from inverters, servo motors and contactors on the factory floor, maintaining stable fieldbus communication in harsh industrial environments. The front panel is equipped with LED indicators for power status, VME bus activity and Bitbus network communication status, helping maintenance technicians quickly diagnose bus timeout, wiring faults and node communication failures 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, process control plants and automated test platforms. This legacy Bitbus controller 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 Bitbus network termination settings before installation. A conformal coated version is optional for high humidity, dusty and corrosive industrial sites. This model is widely used in distributed process control, remote discrete I/O collection, factory automation subnet control and old VME Bitbus system retrofit projects.

This bitbus controller 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 Bitbus network 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 base address and interrupt configuration backup for fast recovery after hardware replacement.

This XYCOM XVME-402 Bitbus controller module is widely applied in legacy VME control racks and industrial automation upgrade projects. It provides dedicated Bitbus protocol conversion and distributed remote I/O networking for the VME master control system. As a reliable discontinued spare part, the XYCOM XVME-402 retains original VME bus timing and Bitbus protocol compatibility, and effectively reduces the renovation cost of legacy industrial control system maintenance.