Siemens 6ES5431-8FA11 | Fail-Safe 8DI 24V DC Output Module

Siemens SIMATIC S5 6ES5431-8FA11 Fail-Safe Digital Input Module

The 6ES5431-8FA11 (Model: Digital Input 431) is a specialized, fail-safe digital input module engineered for the Siemens SIMATIC S5-95F safety-related PLC system. Unlike standard I/O, the 6ES5431-8FA11 (Part Number: 6ES5431-8FA11) is designed to meet stringent safety requirements in industrial environments where human and machine protection is paramount. This module provides 8 isolated digital input channels specifically for 24 VDC signals, enabling the acquisition of safety-critical data from emergency stops, light curtains, and limit switches.

As a high-integrity component within the S5-100U form factor, the 6ES5431-8FA11 (Order Number: 6ES5431-8FA11) features redundant internal circuitry to ensure that a single component failure does not lead to an unsafe state. By providing galvanic isolation between the field inputs and the internal backplane bus, it protects the safety processor from electrical transients. Although Siemens has discontinued the SIMATIC S5 line, this module remains a critical spare part for maintaining the Expertise and Trustworthiness (E-E-A-T) of existing fail-safe installations in automotive, chemical, and energy sectors.

Detailed Technical Specifications

The 6ES5431-8FA11 (Model: 6ES5431-8FA11) is optimized for high-reliability binary signal acquisition within safety-oriented control loops.