The Yokogawa SD1015B02-2SN is a Digital Input (DI) Module for the Yokogawa FA-M3 series of Programmable Logic Controllers (PLCs).
This module serves as a critical interface between field devices and the PLC's central processing unit (CPU). It is designed to read the on/off status (discrete signals) from field devices such as push buttons, limit switches, proximity sensors, and relay contacts. The module converts these DC voltage signals into digital logic levels (1 or 0) and transmits this data to the CPU via the PLC's backplane for processing within the control logic.

The Omron C200H-IA121 is an 8-point AC digital input module for the SYSMAC C200H series PLC. It is designed to interface AC-powered sensors, switches, and contactors into the PLC control system. Each input is optically isolated and equipped with an LED status indicator for direct monitoring.

The SIEMENS 6FM1706-3AA20 is a high-precision position counter module designed for industrial automation systems, offering accurate counting capabilities in harsh environments.