Product Description:

Okuma manufactures the E4809-032-452-C for its E4809 CNC Boards series. The card is an EC I/O interface board used inside Okuma numerical-control cabinets to bridge the machine tool's logic processor with field devices such as sensors and actuators. By translating TTL-level signals from the host control into higher-current lines, it enables real-time on/off control of auxiliary hardware required for automated machining cycles.

The board is addressed in the controller rack through the range E0 to E5, allowing the host to distinguish as many as six identical cards without overlap. It accepts 72 discrete inputs, so limit, position, or safety contacts can be wired directly without external multiplexers. A separate output bank provides 40 transistor outputs that drive indicators or contactors referenced by ladder logic. Three front connectors, listed as CN-E0-2 IN; CN-E0-3 I/O; CN-E0-4 OUT, organize those channels by signal direction and simplify field wiring. Rack power and back-plane signals reach the board through a single edge connector, and the edge connector count is 1, so only one slot position is consumed in the MB-IIB cage.

The output stages are sized for loads such as solenoids, lamps, and relays, letting the machine energize clamps or status lights directly from the card. All command traffic is coordinated by the system's main processor, model MB-IIB, with this card acting as a subordinate hardware resource. Up to 6 boards can coexist in one CNC, expanding channel density for complex lathes or machining centers. Status-only inputs, notably limit switches, are routed to dedicated sense lines so overtravel conditions can interrupt motion immediately. The design omits a CPU on the card itself, which minimizes heat and ensures deterministic response by relying entirely on the master control cycle.