Siemens SIMATIC S5 Digital Input Module 6ES5 420-7LA11

Description

This is a Digital Input Module for the Siemens SIMATIC S5 series, specifically designed for the S5-115U and S5-115H programmable logic controllers. It provides 32 input channels for 24V DC signals, allowing the PLC to monitor various sensors, switches, and other digital field devices. As a component of the legacy S5 system, this module is ideal for repairs, maintenance, and extending the lifespan of existing automation installations.

Specifications

• Manufacturer: Siemens
• Product Line: SIMATIC S5
• Model: 6ES5 420-7LA11
• Product Type: Digital Input Module
• Number of Inputs: 32
• Input Voltage: 24V DC
• Galvanic Isolation: Yes (in groups of 16)
• Compatible Systems: S5-115U, S5-115H

Label Info

• Brand: SIEMENS
• Series: SIMATIC S5
• Part Number: 6ES5 420-7LA11
• Description: DIGITALEINGABE 32 X 24V DC

Application

This module is used in various industrial automation applications to read binary control signals. Common uses include monitoring the status of push-buttons, limit switches, proximity sensors, and other on/off devices within a manufacturing or process control environment.

Country of Origin

Made in Germany.

CO2 Impact

Opting for this pre-owned module instead of a new one prevents the emission of approximately 26.0 kg of CO2. This saving is comparable to the emissions from driving a car for 130 kilometers.

Availability

This product is an obsolete but available spare part. Condition is used but tested and fully functional. Order now from PLC2Day for expert support and fast delivery.

FAQ

What PLC system is this module compatible with?

This module is specifically designed for and compatible with the Siemens SIMATIC S5-115U and S5-115H PLC systems.

No, the module's internal electronics are powered directly from the S5 backplane bus. However, the 24V DC supply for the input signals themselves must be provided externally.

No, the 6ES5 420-7LA11 is for the S5-115U system, while the 6ES5 420-4UA1x family is for the S5-135U/155U systems. They use different backplanes and addressing schemes and are not interchangeable.

Last Update: Friday, March 13, 2026

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