Product Description:

The E4809-045-074-E is an electronic control card produced by Okuma for the E4809 CNC Boards series. Installed inside the electrical cabinet of an Okuma machining center, the board works as an auxiliary I/O processor that transfers real-time status bits and command lines between peripheral sensors, actuators, and the central CNC processor. This role helps the control system off-load low-level signal handling, reduce latency, and maintain deterministic timing for axis drives, spindle orientation, and safety interlocks. Because these signal tasks stay on a dedicated board, the main CNC processor can remain focused on motion execution and supervisory control.

The board provides 4 additional inputs, and each input is mapped to the high byte of the address window at F7FD00–F7FFFF. These points accept 24 V logic from limit switches, tool-change sensors, or coolant flow contacts, and the electrical control processor samples them in step with the CNC scan. It also includes 2 pulse generator channels, which can count or retransmit feedback pulses for handwheel functions. In card slot three, the PG, EC I/O function combines pulse generation and external circuit I/O without requiring extra modules.

On the output side, the card provides 4 additional outputs for driving relays or solenoid valves directly from its onboard drivers. These signals are supervised by the embedded Electrical Control Processor, and the related routines are stored in the secondary memory space at F7DE60–F7DEF7 for card slot three. The mixed-signal section includes D/A, R1C, Encoder, ECBUS resources that convert analog commands, process encoder counts, and pass serial data onto the common backplane. When installed in its rack position, the CNC kernel recognizes the unit as an I/O Board, so handshake lines, ready bits, drive inhibits, and completion flags are exchanged without delay.