Siemens 6ES7421-1BL01-0AA0 Digital Input Module SM 421

6ES74211BL010AA0 – High-density digital input module for SIMATIC S7-400 systems, with 32 isolated 24V DC inputs. Ideal for large-scale signal acquisition applications, offering reliable input detection and robust electrical isolation for industrial environments.

Technical Specifications

• Model: 6ES7421-1BL01-0AA0 Siemens
• Series: SIMATIC S7-400
• Module Type: SM 421 Digital Input
• Input Channels: 32 digital inputs
• Input Voltage: 24V DC
• Input Type: Electrically isolated
• Mounting Type: Rack-mount for S7-400
• Net Weight: 0.770 kg
• Dimensions (W×H×D): 23.3 × 29.7 × 4.1 cm
• Lifecycle Status: Active product (phase-out from 01.10.2025)
• Country of Origin: Germany

Function & Application

Purpose:
The SM 421 DI 32×24V DC module provides reliable and electrically isolated signal detection for high-volume digital inputs. Suitable for applications requiring dense input configurations and enhanced protection from electrical noise.

Typical Applications:

• Monitoring of sensors, switches, and pushbuttons
• Large-scale digital input acquisition
• Machine control and status detection
• Industrial I/O expansion for S7-400 systems

Performance & Features

• 32 Digital Inputs : Supports high-volume signal acquisition
• 24V DC Operation : Compatible with standard industrial control voltages
• Isolated Inputs : Prevents cross-channel interference and enhances reliability
• Compact Design : Fits seamlessly in S7-400 racks
• Long Lifecycle Support : Product active until phase-out date in 2025

Recommended Accessories

• 6ES7392-1AM00-0AA0 – Front Connector with Screw Contacts (40-pole)
• 9MC0110-1EG00-0AA3 – Brownfield Connectivity Starter Kit

6ES7421-1BL01-0AA0 Compliance & Classification

• RoHS Compliance: Since 01.03.2008
• WEEE Take-Back Obligation: Yes
• REACH Substances:
  • Lead monoxide (CAS 1317-36-8) > 0.1%
  • Tris(4-nonylphenyl, branched and linear) phosphite > 0.1%
• SCIP Number: 52320a7a-6161-4ce8-93b2-b9d2011354fa
• Commodity Code: 85389091
• Catalog ID: ST74
• Product Group: 4041
• Group Code: R338
• Product Class: A – Returnable stock item
• EAN: 4019169021463
• UPC: 662643186635

Key Features & Benefits:

✅ 32 Isolated Inputs : High-density digital input acquisition.

✅ 24V DC Compatibility : Standard industrial signal level.

✅ Long-Term Availability : Active product with future support.

✅ Compact for S7-400 : Space-efficient, fits in existing racks.

✅ Accessory Compatible : Works with standard S7-400 front connectors.

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