Product Description:

The E4809-045-174-E digital I/O board is manufactured by Okuma and belongs to the E4809 CNC Boards series. The module adds parallel input and output capacity to an Okuma CNC system so that proximity switches, limit sensors, relays, and solenoid valves can be wired directly to the control. By translating 24-volt field signals into backplane data and returning drive commands in the opposite direction, the board lets the machine tool execute sequencing, interlocks, and safety reactions within the deterministic scan time of the numerical controller.

On the input side, the card provides 32 optically isolated channels organized as a single 4-byte data image. Each channel sinks 14 mA when energized, which is high enough to resist electrical noise on long cable runs. A photocoupler on every path delivers galvanic separation between the machine wiring and the logic core, protecting the processor from transients. The accepted signal level is 24 VDC, matching the standard control voltage used throughout Okuma electrical cabinets. Input data are latched synchronously with the servo cycle so PLC ladder instructions can react to sensor changes without additional delay or software polling.

The output section mirrors the input structure but drives field loads instead of reading them, and its data occupy another four-byte register. Each of the 32 channels can switch up to 2 A through a bank of power MOS transistors, allowing direct operation of clutches, lamps, and small solenoids without interposing relays. Output energy is supplied by a separate 24-volt rail, and the module identity on the backplane is configured through slave addressing by switch using rotary dials. This arrangement helps match the board to the control rack while maintaining signal integrity under the switching stresses encountered in CNC machine service.