---
product_id: 26578710
title: "Siemens | 6ES7421-1BL01-0AA0 | SM 421 Digital Input Module"
price: "€ 633.38"
currency: EUR
in_stock: true
url: https://www.desertcart.hr/products/26578710-siemens-6es7421-1bl01-0aa0-sm-421-digital-input-module
store_origin: HR
region: Croatia
---

# 24 VDC power input 32 digital input points Optical isolation for signal integrity Siemens | 6ES7421-1BL01-0AA0 | SM 421 Digital Input Module

**Price:** € 633.38
**Availability:** ✅ In Stock

## Summary

> ⚙️ Elevate your automation game with Siemens’ precision digital input module!

## Quick Answers

- **What is this?** Siemens | 6ES7421-1BL01-0AA0 | SM 421 Digital Input Module
- **How much does it cost?** € 633.38 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/26578710-siemens-6es7421-1bl01-0aa0-sm-421-digital-input-module)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Last:** Trusted Siemens engineering with a robust 1.72-pound build, designed for continuous industrial use without compromise.
- • **Maximized Connectivity:** 32 digital input channels let you monitor multiple signals simultaneously, boosting your system’s responsiveness.
- • **Power-Packed Precision:** Reliable 24 VDC input ensures stable and efficient operation in demanding industrial environments.
- • **Compact Industrial Design:** Slim 9.17 x 11.69 x 1.61 inch form factor fits seamlessly into your existing Simatic S7-400 rack setup.
- • **Signal Integrity Guaranteed:** Optical isolation protects your PLC from electrical noise, ensuring flawless data transmission every time.

## Overview

The Siemens 6ES7421-1BL01-0AA0 SM 421 is a high-performance digital input module designed for the Simatic S7-400 PLC system. Featuring 32 isolated digital inputs operating at 24 VDC, it ensures reliable signal processing with optical isolation to protect against electrical interference. Its compact design and durable build make it an essential component for advanced industrial automation control.

## Description

Siemens 6Es7421-1Bl01-0Aa0 Simatic S7 Digital Input Module Isolatedoptic 32 Di24 Vdc20 Ma

## Features

- 24 VDC
- 32 POINT
- DIGITAL
- INPUT MODULE
- PLC Module/Rack

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0028YMNJW |
| Date First Available | August 10, 2012 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1.72 pounds |
| Item model number | SIMATIC S7 400 |
| Manufacturer | SIEMENS |
| Product Dimensions | 9.17 x 11.69 x 1.61 inches |

## Images

![Siemens | 6ES7421-1BL01-0AA0 | SM 421 Digital Input Module - Image 1](https://m.media-amazon.com/images/I/41h3X3RYwbL.jpg)

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**Shop now:** [https://www.desertcart.hr/products/26578710-siemens-6es7421-1bl01-0aa0-sm-421-digital-input-module](https://www.desertcart.hr/products/26578710-siemens-6es7421-1bl01-0aa0-sm-421-digital-input-module)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-07-03*