SIEMENS 6ES7221-1BH32-0XB0 Used Working SIMATIC S7-1200 Digital Input

Product Overview

The Siemens 6ES7221-1BH32-0XB0 (SM 1221) is a high-density Digital Input Expansion Module for the SIMATIC S7-1200 PLC series. This module provides 16 discrete inputs (24V DC), allowing you to significantly expand the monitoring capabilities of your S7-1200 CPU without moving to a larger controller. Known for its rugged industrial build and seamless integration into the TIA Portal, this Used Working unit is an essential component for projects requiring high I/O density for sensors, pushbuttons, and limit switches in factory automation.

Key Features

• 16 Digital Inputs: High-density configuration providing sixteen 24V DC (Sink/Source) inputs in a single compact module.
• TIA Portal Integration: Fully recognized by Siemens TIA Portal software for easy hardware configuration, mapping, and diagnostics.
• Flexible Wiring: Supports both P-reading (sink) and M-reading (source) input configurations to match your existing field devices.
• Diagnostic LEDs: Features individual green LEDs for each input channel to show signal status, along with a "Diag" LED for module health.
• Galvanic Isolation: The inputs are galvanically isolated from the backplane bus, protecting the CPU from field-side electrical surges.
• Snap-on Mounting: Designed for 35mm DIN rail mounting, connecting to the CPU via the integrated slide-out bus connector on the side.

Item Condition (Used - Working)

• Functional Status: Used - Working. This module has been professionally pulled from a decommissioned SIMATIC S7-1200 rack. It has been bench-tested for signal continuity across all 16 channels and verified for bus communication.
• Physical State: Excellent condition. The terminal doors are intact, and the front labeling is clear. The side bus connector pins are straight and clean.
• Technical Integrity: No burnt terminals or signs of thermal stress. The unit is ready for immediate installation and configuration.
• Visual Reference: Please examine the high-resolution images to verify the hardware version (E-Stand); the unit pictured is the exact Siemens SM 1221 module you will receive.

Package Includes

1. 1 x Siemens SIMATIC S7-1221 Digital Input Module (Used)
2. 2 x Removable Terminal Blocks (Attached)
3. Note: Does not include original Siemens factory packaging or the S7-1200 CPU.