This unit is a USED Siemens 6ES7 132‑4BD30‑0AA0 SIMATIC S7 digital output module designed to provide discrete output control within a Siemens S7 automation system. The module switches connected field devices on and off based on controller commands and is used in industrial control panels and machine automation environments.

This unit is a USED Siemens 6ES7 131‑4EB00‑0AB0 SIMATIC S7 digital input module designed to monitor discrete AC input signals within an S7 automation system. This module provides multiple AC voltage input channels and is used for detecting field device states in industrial control panels and automation systems.

This listing is for a USED WAGO I/O module, part number 750‑550. The module is part of the WAGO 750 Series I/O System and is designed for use in modular PLC and distributed I/O applications. It features a slim DIN‑rail‑mount form factor with front‑facing wire connection points and LED status indicators for channel monitoring.

This listing is for a USED Siemens 6ES7421‑1BL01‑0AA0 SIMATIC S7‑400 digital input module. It is designed for high‑density 24VDC input signal acquisition in S7‑400 automation systems. This unit is categorized as a 32‑channel digital input card and includes isolated 24VDC DI capability, robust signal handling, and compatibility with standard S7‑400 rack architectures.