The Yokogawa SD1050A-2/90S0057 is a Digital Output Module and its associated Terminal Block Unit for the Yokogawa FA-M3 series of Programmable Logic Controllers (PLCs).
This module is a critical interface component that allows the PLC's CPU to control external field devices. It receives digital commands (ON/OFF) from the CPU via the backplane and uses them to switch solid-state outputs that can drive loads such as solenoid valves, motor starters, contactors, indicator lamps, and other AC-powered devices.