투명성은 하나의 기능입니다.

/**
 * Signal direction from the PLC's perspective (same nomenclature as Unity/realvirtual):
 *   'input'  = a PLC input  → the PLC reads it  → the viewer WRITES it (sent to PLC).
 *   'output' = a PLC output → the PLC writes it → the viewer READS it (display only).
 */
export type SignalDirection = 'input' | 'output';

/** Signal type matching Unity PLC signal types. */
export type SignalType = 'bool' | 'int' | 'float';