Siemens 6ES7326-1RF01-0AB0 SIMATIC S7-300 SM 326 F-Digital Input Module

Overview

The 6ES7326-1RF01-0AB0 (6ES7326-1RF01-0AB0) is a high-integrity, fail-safe digital input module designed for the SIMATIC S7-300 and ET 200M systems. This module is specifically engineered for use in "F-Systems" (Safety Integrated), supporting NAMUR sensor inputs for hazardous or safety-critical environments. It meets the most stringent global safety standards, including SIL 3 (IEC 61508) and PLe (ISO 13849). By monitoring for wire breaks and short circuits at the input level, the SM 326 ensures that emergency shutdowns and critical interlocks are executed with absolute reliability.

Detailed Specifications

Operational Capabilities

The 6ES7326-1RF01-0AB0 is optimized for chemical, oil, and gas applications where NAMUR sensors (proximity or switch) are standard. Because it is an "F-module," it performs continuous self-tests of its internal circuitry. In the event of an detected discrepancy or field-side fault, the module transitions to a safe state, effectively de-energizing its associated safety logic. Its 80mm double-width housing is necessary to accommodate the redundant safety architecture and diagnostic hardware required for Category 4 operation.

FAQs

What is a NAMUR input in the context of this module?

NAMUR inputs (per DIN EN 60947-5-6) allow the module to distinguish between four distinct states: Open circuit, Closed circuit, Wire break (low current), and Short circuit (high current). This is essential for safety systems to identify a "failed" sensor versus a "triggered" sensor.

Can I use this module with a standard S7-300 CPU?

The hardware will fit in a standard rack, but to utilize the fail-safe features, you must use a "Fail-Safe" CPU (e.g., CPU 315F, 317F) and configure the system using the S7 Distributed Safety or Safety Advanced software package.