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Siemens SIMATIC S7-400 SM 421 Digital Input Module - 32 DI, 24V DC

Name: Siemens 6ES7421-1BL01-0AA0
Brand: Siemens
SKU: 6ES7421-1BL01-0AA0
Availability: InStock

Siemens S7-400 SM 421 digital input module, 32 isolated DI, 24V DC.

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ManufacturerSiemens

Part number6ES7421-1BL01-0AA0

Inputs 32 DI

Voltage 24V DC

Isolation Isolated

Series SIMATIC S7-400 SM 421

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12-month warranty

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32 Isolated Digital Inputs 24V DC Signal Compatibility S7-400 Series Integration Enhanced Signal Integrity Industrial Grade

Product description

The Siemens SIMATIC S7-400 SM 421 (6ES7421-1BL01-0AA0) is an isolated digital input module offering 32 channels for 24V DC signals. Designed for high-integrity signal processing, it enhances the reliability of discrete input acquisition in complex automation setups.

This module is ideal for demanding industrial environments requiring robust monitoring of 24V DC control signals. Its isolated design protects the PLC from electrical noise and transients, ensuring stable operation in manufacturing, process control, and building automation.

Stanlo Automation, a veteran-owned surplus distributor, provides access to essential industrial parts like the Siemens 6ES7421-1BL01-0AA0. We are committed to delivering quality surplus automation components to keep your operations running smoothly.

Technical specifications

Inputs	32 DI
Voltage	24V DC
Isolation	Isolated
Series	SIMATIC S7-400 SM 421

Common applications

Industrial Control

Machine Automation

PLC Systems

Factory Automation

Process Monitoring

Compatible systems

SIMATIC S7-400 PLC Systems

Also known as

Siemens S7-400 Input Card SM 421 32-Channel DI 6ES74211BL010AA0

Replaces / compatible with

This module can replace earlier versions or similar Siemens S7-400 digital input modules. It is compatible with the Siemens S7-400 PLC family.

Technical note

Expert tip

The isolated nature of the inputs on the 6ES7421-1BL01-0AA0 is crucial for applications with varying ground potentials or high electrical noise.

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Frequently asked questions

What are the isolation specifications for the Siemens 6ES7421-1BL01-0AA0?

The Siemens 6ES7421-1BL01-0AA0 SM 421 module features isolated digital inputs. This isolation helps prevent ground loops and protects the PLC from voltage spikes, ensuring reliable data acquisition for 24V DC signals.