Siemens 6ES7138-7FN00-0AB0 SIMATIC ET 200iSP 8F-DI NAMUR Ex SIL3 Fail-safe Remote I/O Module

The Siemens 6ES7138-7FN00-0AB0 is a fail-safe SIMATIC ET 200iSP digital input module with 8 NAMUR-encoder channels for Zone 1 gas areas, certified SIL 3 per IEC 61508 and PLe per ISO 13849-1, reaching Category 4 in two-channel wiring or Category 3 single-channel per EN 954-1. It draws 145 mA typical from its DC supply and reads wire-break and short-circuit faults per channel.

Technical Specifications

Certifications & Standards

• CE

Selection Notes

NAMUR-only wiring per DIN 19234 is what limits this module to proximity switches and mechanical contacts with the standard 10 kohm parallel resistor rather than general-purpose 24 V sensors. Two-channel wiring of a NAMUR sensor pair reaches Category 4 / SIL 3, while a single-channel sensor is limited to Category 3, so the wiring scheme should match the interlock's required safety integrity. The 8-channel count and 500 m shielded cable length suit spreading sensors across a large hazardous-area skid from one module.