SIEMENS 6ES5 420-7LA11

Siemens SIMATIC S5 32-Point Digital Input Module

Description

The 6ES5 420-7LA11 is a digital input module from the Siemens SIMATIC S5 series, designed for reliable signal acquisition in industrial environments. It provides 32 digital inputs operating at 24V DC, making it a crucial component for legacy automation systems that utilize the S5-135U and S5-155U platforms. This module is an essential spare part for maintaining and extending the life of existing machinery.

Specifications

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

Label Info

• Part Number: 6ES5420-7LA11
• E-Stand (Version): 04

Application

This module is typically used in manufacturing plants, process control systems, and machine automation to read signals from sensors, push buttons, limit switches, and other digital field devices.

Country of Origin

Made in Germany.

CO2 Impact

Choosing a refurbished part like this one avoids approximately 60 kg of CO2 emissions compared to producing a new one. This saving is equivalent to the emissions of a 300 km car journey.

Availability

This product is an obsolete item but is available from our stock. Order now from spareparts2day for expert support and fast delivery.

FAQ

What PLC systems is the 6ES5 420-7LA11 compatible with?

This module is designed for use with the Siemens SIMATIC S5-135U and S5-155U central controllers and their corresponding racks.

Is any special programming required to replace an older version of this module?

No, as long as the replacement has the same part number (6ES5 420-7LA11), it is a direct hardware swap. The PLC program will recognize it without any modification.

What is the “E-Stand” (E-Version) 04 and is it important?

The E-Stand indicates the hardware revision. Version 04 is a specific release. While later versions are often backward-compatible, for critical applications it is best to match the E-Stand of the module being replaced to ensure identical performance and features.

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Last Update: Friday, March 13, 2026