Siemens 6ES7421-7BH01-0AB0 Digital Input Module

Siemens 

Siemens 6ES7421-7BH01-0AB0 Digital Input Module

Product 6ES7421-7BH01-0AB0

Model:6ES7421-7BH01-0AB0

Brand:Siemens 

Type:Digital Input Module

Rated value (DC)： 24 V

Permissible range, lower limit (DC)： 20.4 V

Permissible range, upper limit (DC)： 28.8 V

From supply voltage L+, max： 120 mA

From backplane bus 5 V DC, max： 130 mA

Number of outputs： 2

Type of output voltage： L+ (-2.5 V)

Rated value： 120 mA

Permissible range, upper limit： 150 mA

Power loss, typ： 5 W

The Siemens 6ES7421-7BH01-0AB0 Digital Input Module is a dedicated SM 421 digital input card designed for 

use in SIMATIC S7‑400 PLC systems. It provides isolated digital input channels that interface with field devices 

such as switches and sensors, converting physical on/off signals into logic states that the S7‑400 controller can 

process. The module includes configurable diagnostics and an input delay alarm function that enhances system 

responsiveness and fault visibility within industrial automation applications.

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