AMIKON Industrial Supply · GE Mark VIeS IS220YDIAS1AK Discrete input I/O pack for GE Mark VIeS control hardware, identified by its 28 V DC supply rating , contact-input interface and hazardous-location markings. YDIA · DISCRETE INPUT Hardware ID 336A4940LBP21 ART Rev 1 Function & System Context Field signal → I/O pack → control system The IS220YDIAS1A product family is identified as a Mark VIeS discrete input module. It provides the electrical interface between contact inputs