Siemens 6ES7421-1BL01-0AA0 | Digital Input Module

Siemens 6ES7421-1BL01-0AA0 | SIMATIC S7-400 Digital Input Module

Overview

The Siemens 6ES7421-1BL01-0AA0 is a digital input module designed for the SIMATIC S7-400 automation system. It offers 32 digital inputs at 24V DC in sink (negative logic) configuration, supporting the reliable acquisition of binary signals in industrial control applications. The module uses a 40-pin front connector and occupies a single slot in the S7-400 rack.

Key Features

• Input Channels: 32 digital inputs

• Input Voltage: 24V DC (sink)

• Front Connector Type: 1 x 40-pin (not included)

• Module Width: 1 slot

• Diagnostics: Group diagnostics via LEDs

• Signal Delay: Approx. 3.2 ms

• Isolation: Between channels and backplane

• LED Indicators: Per group for status diagnostics

• Hot Swappable: Yes, with rack power on

Technical Specifications

• Catalog Number: 6ES7421-1BL01-0AA0

• Input Type: DC 24V, sink (IEC type 1/3)

• Current per Input: Approx. 6 mA

• Backplane Current Draw: Approx. 55 mA

• Dimensions (W x H x D): Approx. 25 mm x 290 mm x 210 mm

• Weight: Approx. 0.5 kg

• Protection Class: IP20

• Operating Temperature: 0°C to +60°C

• Certifications: CE, UL, CSA, RoHS

• Compatible Systems: SIMATIC S7-400 racks and CPUs

Applications

• Industrial Automation Systems

• Manufacturing and Assembly Lines

• Control Cabinets for Machinery

• Process Monitoring and Input Collection

• OEM Automation Integration

Why Choose the 6ES7421-1BL01-0AA0?

• High Channel Density: 32 inputs in a single-slot width

• Reliable Signal Acquisition: Stable 24V DC input range

• Compact Rack Integration: Ideal for control cabinet space optimization

• Diagnostic LEDs: Quick status checks for maintenance

• Siemens Quality: Durable, long-life module for critical systems

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Available for worldwide delivery.