Radisys 459826-002 Retrofit-Compatible CPU Board for Legacy Systems

Radisys 459826-002 Retrofit-Compatible CPU Board for Legacy Systems

The Radisys 459826-002 (alternate part number 869-8099-003B) is a CompactPCI-format embedded CPU board originally designed for the FX-301 series platform — a widely deployed embedded computing chassis used across telecom infrastructure, industrial automation, and process control environments. As Radisys has transitioned its product portfolio and the FX-301 series has reached end-of-life status, maintenance engineers and system integrators face increasing pressure to source verified replacement boards that maintain backward compatibility with existing backplane configurations, I/O wiring, and software environments. NINERMAS maintains ready stock of the 459826-002 / 869-8099-003B, pre-shipment tested and covered by a 12-month warranty, to support customers managing legacy system continuity without full platform replacement.

This board measures 450mm × 190mm and is designed for direct slot-in replacement within FX-301 chassis configurations. Before installation, engineers should verify the backplane slot assignment, confirm the board address settings match the original module’s DIP switch or jumper configuration, and review the power rail requirements — the FX-301 platform typically supplies +3.3V, +5V, and ±12V across the CompactPCI backplane, and any deviation in power sequencing can affect board initialization. The 459826-002 is compatible with the standard 32-bit/33MHz CompactPCI bus, and customers migrating from earlier Radisys EPC-3100 or EPC-3305 processor boards should confirm that the system BIOS and boot loader versions are aligned before swapping modules.

Upgrade Compatibility Table

Retrofit Planning for Existing Automation Systems

Replacing the Radisys 459826-002 within an operational control system requires careful pre-migration planning to avoid unplanned downtime and configuration loss. The FX-301 platform is commonly integrated with Radisys PMC-4375 mezzanine modules for additional I/O expansion, and customers should document all PMC slot assignments before removing the host CPU board. In systems where the 459826-002 interfaces with a Radisys PMC-2533 communications mezzanine for serial protocol bridging, the COM port address mapping must be re-verified after board replacement, as the new board may enumerate ports differently depending on BIOS initialization order.

For control cabinets that include a Radisys CPCI-6020 passive backplane or similar 8-slot CompactPCI chassis, the system integrator should confirm that the backplane’s power distribution board — often a Radisys cPCI-6600 or equivalent — can sustain the inrush current during board hot-swap or cold-boot sequences. In installations where the 459826-002 serves as the system controller for a distributed I/O network, the downstream I/O modules, signal isolators, and field terminal blocks must remain powered and addressed correctly throughout the swap procedure to prevent field device faults from propagating to the control program.

HMI panels connected via Ethernet or serial links to the FX-301 platform — including legacy operator panels running proprietary Radisys runtime environments — should be placed in manual or maintenance mode before the CPU board is removed. After the 459826-002 replacement is seated and powered, the HMI communication link should be re-established and all screen tags verified against the restored program. In systems where a Radisys ATCA-4500 or COM-345 module handles higher-level supervisory communication, the IP address and routing table of the new board must be configured to match the original before reconnecting to the plant network. Programming cables compatible with the FX-301 platform should be on-site during commissioning to allow direct console access if network connectivity is not immediately available.

Terminal wiring on the transition module — typically a Radisys 900-0049 or equivalent rear-transition card — should be photographed and labeled before disconnection. Signal types including analog inputs, digital outputs, thermocouple channels, and pulse counter inputs must be reconnected to the correct terminal positions on the transition card after the CPU board swap. Any mismatch in terminal assignment will result in incorrect field readings and may trigger safety interlocks in the control program.

Downtime Control During System Migration

Minimizing downtime during a Radisys 459826-002 replacement begins with a complete backup of the existing program logic, configuration files, and HMI project before any hardware is disturbed. Engineers should use the platform’s native backup utility or a compatible programming cable to extract the full application image, including PID tuning parameters, alarm setpoints, and communication configuration tables. This backup serves as the recovery baseline if the replacement board requires re-flashing or if the boot sequence does not complete as expected.

Where the production process permits, a parallel test environment using a spare FX-301 chassis or a software emulator should be used to validate the restored program on the 459826-002 before the live system is switched over. In critical continuous-process environments where a cold switchover is not feasible, the replacement board should be pre-configured offline — including IP address assignment, serial port mapping, and I/O module addressing — so that the live changeover window is limited to physical installation and a single controlled restart. NINERMAS ships the 459826-002 / 869-8099-003B with pre-shipment functional testing completed, reducing the risk of receiving a non-functional unit and shortening the on-site commissioning window. The 12-month warranty covers the board from the date of shipment, providing assurance throughout the post-migration stabilization period.

Retrofit Support FAQ

Q: Is the 459826-002 a direct drop-in replacement for the 869-8099-003B in an FX-301 chassis?
A: Yes. The 459826-002 and 869-8099-003B are cross-reference part numbers for the same Radisys CPU board. Physical dimensions (450mm × 190mm), connector pinout, and backplane interface are identical, making it a direct slot-in replacement. Firmware version alignment should be confirmed before powering the system.

Q: Does NINERMAS test the board before shipment?
A: Yes. All units are functionally tested prior to shipment. Each board is covered by a 12-month warranty from the date of shipment. Test records are available upon request for quality-critical applications.

Q: What should I verify regarding wiring and terminal connections before replacing the board?
A: Photograph and label all terminal connections on the rear-transition module before disconnection. Verify analog input ranges, digital I/O polarity, and serial port assignments against the original system documentation. Re-confirm all connections after installation before powering the system.

Q: How quickly can NINERMAS ship the 459826-002?
A: NINERMAS maintains ready inventory of the 459826-002 / 869-8099-003B to support urgent maintenance requirements. Lead time and stock availability can be confirmed by contacting our sales team directly. Express shipping options are available for critical downtime situations.