Siemens SIMATIC S5 Digital Input Module 32-Point 24V DC 6ES5 420-7LA11

Description

The Siemens 6ES5 420-7LA11 is a digital input module for the SIMATIC S5 automation system. Part of the robust and widely-used S5-115U series, this module provides 32 input channels for 24V DC signals. It features floating inputs, which means the input channels are galvanically isolated from the PLC's backplane bus, enhancing system stability and noise immunity. This module is an essential spare part for maintaining existing industrial control systems built on the proven Siemens S5 platform.

Specifications

• Manufacturer: Siemens
• Product Series: SIMATIC S5
• Module Type: Digital Input Module
• Number of Inputs: 32
• Input Voltage: 24V DC
• Isolation: Floating (Potential-isolated)
• System Compatibility: S5-115U, S5-115H, S5-115F
• Connection Method: Screw terminals under front flap

Label Info

• Brand: SIEMENS
• Model: 6ES5 420-7LA11
• Series: SIMATIC S5

Application

This module is ideal for interfacing with a variety of field devices such as push-buttons, limit switches, proximity sensors, and other control signals within automated machinery and process control environments that utilize the Siemens S5-115U PLC family.

Country of Origin

This product is Made in Germany, ensuring high-quality manufacturing and reliability.

CO2 Impact

By purchasing this refurbished module, you are preventing electronic waste and saving approximately 60 kg of CO2 emissions. This saving is comparable to the emissions produced by driving an average car for 300 kilometers.

Availability

This is an obsolete item, but it is available from our stock. Order now from PLC2Day for expert support and fast delivery.

FAQ

No, the 6ES5 420-7LA11 is designed for the larger S5-115U, S5-115H, and S5-115F systems. It does not fit the form factor or bus system of the S5-95U compact PLCs.

The typical input delay for the 6ES5 420-7LA11 is in the range of 15 to 25 milliseconds for a 0 to 1 signal change, which is standard for this generation of I/O modules.

Yes, this module is suitable for connecting 2-wire proximity sensors. However, you must ensure the sensor's residual current in the blocked state is low enough to not be registered as a high signal by the input. Refer to the S5-115U system manual for specific limits.

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Last Update: Friday, March 13, 2026