Mitsubishi Electric Corporation A1SY81 DC Output Module

The Mitsubishi Electric A1SY81 DC Output Module is a 16-point DC transistor output module for MELSEC-A PLC systems, designed to provide reliable digital outputs from a rack-mounted base unit. As part of the MELSEC-A Series, it delivers 12/24 VDC outputs with about 0.5 A per point and uses photocoupler isolation to keep control circuitry separated from field devices. With high-speed switching, it supports fast, dependable control of relays, solenoids, contactors, and indicators across production lines, conveyors, packaging machinery, and other factory automation equipment. Maintenance teams, OEMs, and system integrators rely on the A1SY81 for expansion, replacement, or retrofit of legacy PLC output systems. Key specifications include 16 output points, output type DC transistor, rated 12/24 VDC, approx. 0.5 A per point, and rack-mounted mounting on an A-series base unit, ensuring compatibility with Mitsubishi MELSEC-A Series PLCs. Common replacements for this module are A1SY42, A1SY10, and QY81P.