Siemens SIMATIC S5 Digital Input Module

Description

The 6ES5 420-7LA11 is a digital input module from the Siemens SIMATIC S5 family, a cornerstone of industrial automation for many years. This module is specifically designed for the S5-135U and S5-155U programmable logic controllers, providing a reliable interface for 32 digital input signals. It operates on a 24V DC signal level, making it suitable for a wide range of standard sensors and switches. As a vital component for legacy systems, this module helps ensure the continued operation and maintenance of established manufacturing processes.

Specifications

• Manufacturer: Siemens
• Product Line: SIMATIC S5
• Model Number: 6ES5 420-7LA11
• Product Type: Digital Input Module
• Number of Inputs: 32
• Input Voltage: 24V DC
• Compatibility: S5-135U / S5-155U PLC Systems
• Floating Inputs: No

Label Info

• Order No.: 1P 6ES5 420-7LA11
• Serial No.: S C-HDF02006
• E-Stand: 12

Application

This digital input module is used in various industrial automation applications to read binary signals from push buttons, limit switches, proximity sensors, and other field devices. It is essential for monitoring machine states and providing the PLC with the necessary data for control logic.

Country of Origin

Made in Germany.

CO2 Impact

Choosing a refurbished part like this Siemens S5 module saves approximately 36 kg of CO2 compared to producing a new one. This reduction is a significant contribution to sustainable industrial practices.

Availability

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

FAQ

No, the 6ES5 420-7LA11 is specifically designed for the larger S5-135U and S5-155U rack systems and is not compatible with the S5-115U chassis.

This module typically requires a 40-pin Siemens front connector, such as the 6ES5 498-1AA11 (screw-type) or 6ES5 498-1AA21 (crimp-type), for proper connection to field devices.

Yes, in most cases, a higher E-Stand (hardware version) is a direct, compatible replacement for an older one. E-Stand 12 includes all the functionality and bug fixes of previous versions and should work seamlessly as a replacement.

PLC2DAY is not an authorized distributor, reseller, or representative of the products featured on this website. All product names, trademarks, brands, and logos used on this site are the property of their respective owners.

Last Update: Friday, March 13, 2026