The Mitsubishi Electric AJ71C21-S1 Terminal Interface Module is a MELSEC AJ71 series device that provides the terminal-side connection for MELSEC controllers. Identified by the part number AJ71C21-S1, it serves as the interface between field wiring and the MELSEC AJ71 controller family, enabling termination of I/O signals for the PLC. This module is used in automation installations to connect and organize the terminal wiring required by MELSEC control systems.
