Siemens SIMATIC S5 32-Point Digital Input Module

Description

The Siemens 6ES5 420-7LA11 is a digital input module for the proven SIMATIC S5 PLC series. It provides 32 input channels for 24V DC signals, making it an essential component for monitoring sensors, switches, and other field devices. This module is ideal for spare parts inventory or for repairing existing S5-115U, S5-135U, and S5-155U automation systems.

Specifications

• Manufacturer: Siemens
• Product Series: SIMATIC S5
• Part Number: 6ES5 420-7LA11
• Module Type: Digital Input Module
• Number of Inputs: 32
• Input Voltage: 24V DC
• Isolation: Non-floating (common ground)

Label Info

• Brand: SIEMENS
• Product Name: SIMATIC S5 DIGITAL INPUT
• Specification: 32x24V DC
• Model: 6ES5 420-7LA11

Application

This module is used in legacy industrial automation applications to read binary control signals from the field. It is a critical part for maintaining machinery and production lines that rely on the robust and widely-deployed Siemens S5 platform.

Country of Origin

Made in Germany.

CO2 Impact

By purchasing this pre-owned module, you are contributing to the circular economy and avoiding approximately 24 kg of CO2 emissions that would be generated from manufacturing a new replacement. This saving is comparable to driving a car for 120 km.

Availability

This product is an obsolete legacy component but is available as a refurbished spare part. Ensure the longevity of your existing control systems with this reliable module. Order now from PLC2Day for expert support and fast delivery.

FAQ

Is this module compatible with my S5-95U PLC?

No, the 6ES5 420-7LA11 is designed for the larger S5-115U, S5-135U, and S5-155U central processing units and racks. It is not compatible with the smaller S5-90U/S5-95U/S5-100U series.

The front connector (part number 6ES5 498-1AA11 or similar) is typically sold separately. Please check the product listing details or contact us to confirm if a connector is included with this specific item.

This is a non-floating (or non-isolated) input module, meaning all 32 inputs share a common ground (M). Floating (or isolated) modules have inputs that are galvanically isolated from each other in groups, which provides better noise immunity and protection in certain applications.

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Last Update: Friday, March 13, 2026