The Mitsubishi Electric A1S55B-S1 Base Unit MELSEC PLC is a 5-slot base unit designed to configure a Mitsubishi MELSEC PLC system. Its model number A1S55B-S1 identifies this base unit within the MELSEC family, providing the platform on which expansion modules are installed. This base unit serves as the foundation for assembling a complete MELSEC automation solution by accommodating expansion modules.
