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

Description

This is a Digital Input Module for the Siemens SIMATIC S5 PLC system. Model 6ES5 420-7LA11 provides 32 digital input channels rated for 24V DC. It is a vital component for maintaining legacy automation systems that rely on the robust and dependable S5-135U and S5-155U controller families. This module is ideal for spare parts inventory or for repairing existing installations.

Specifications

• Manufacturer: Siemens
• Product Line: SIMATIC S5
• Part Number: 6ES5 420-7LA11
• Module Type: Digital Input Module
• Number of Inputs: 32
• Input Voltage: 24V DC
• Compatibility: S5-135U, S5-155U PLCs

Label Info

• Model: 6ES5 420-7LA11
• E-Stand (Version): 12

Application

Designed for integration into a wide range of industrial control applications built on the Siemens SIMATIC S5 platform. Common uses include monitoring sensors, switches, and other field devices in manufacturing, process control, and material handling systems.

Country of Origin

Made in Germany.

CO2 Impact

Opting for a reconditioned part like this one instead of new production avoids significant CO2 emissions. This single module represents an estimated 24 kg of avoided CO2, which is comparable to the emissions saved by not driving a car for 120 kilometers.

Availability

This product is an obsolete legacy component and is available as a refurbished item. It has been tested to ensure functionality. Order now from PLC2Day for expert support and fast delivery.

FAQ

This module, 6ES5 420-7LA11, is designed for use with the central controllers of the higher-end Siemens SIMATIC S5 series, specifically the S5-135U and S5-155U systems.

Yes, like most SIMATIC S5 modules, this one requires a front connector to connect the field wiring. The appropriate connector (e.g., 6ES5 498-1AAx1) is not included with the module and must be sourced separately.

The modern equivalent is the Siemens SIMATIC S7 series, managed with the TIA Portal software. A migration would typically involve replacing the S5 rack, CPU, power supply, and I/O modules with their S7-1500 counterparts. This requires significant engineering effort, including program conversion and hardware redesign.

Last Update: March 13, 2026

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