Product Description:

The E4809-045-216-B is a modular circuit-board assembly produced by Okuma for the E4809 CNC Boards series. Installed inside the company’s OSP controllers, the unit forms the backbone of machine-tool automation by coordinating motion control, sequencing, and operator interaction. Serving as a central electronics rack, it accepts specialized processor cards so lathes, grinders, and machining centers can execute program code, exchange data with drives, and present status information through the operator interface.

Power is supplied at 24 VDC through a single distribution backplane that includes one dedicated power-supply slot and regenerates logic and analog rails of +5 VDC, +12 VDC, -12 VDC. The chassis provides 3 control board slots, each keyed to accept application-specific cards. At the center sits the UCMB main CPU board, which uses DRAM as working memory, and capacity can be expanded with plug-in modules of 4, 8, 16 MByte to match program size. Flash devices hold operating data through power loss, while two LED indicator sets give visual confirmation of bus activity and alarm states. One RS-232C channel enables program upload or diagnostic communication with external PCs, and the backplane layout keeps noise-sensitive traces isolated.

The ACP card handles key input and display activity for the front panel, while the FCP card supervises PLC, I/O, servo, sensor, and timing tasks to keep real-time events synchronized. Motion data moves over a servo link that supports 8 axes per channel, allowing complex multi-axis machines to be driven without additional hardware. Volatile setup information stored in SRAM is protected by a Battery Unit, preventing data loss during extended shutdowns. When software updates are required, part programs can be loaded through the 3.5-inch floppy interface as an alternative where network access is restricted.