Siemens 6ES7148-4FA00-0AB0 SIMATIC ET 200pro F-DI 8/16 24V DC PROFIsafe Fail-safe I/O Module

The Siemens 6ES7148-4FA00-0AB0 is a fail-safe F-DI electronic module for the SIMATIC ET 200pro distributed I/O system, providing 16 safety-related 24 V DC digital inputs, configurable as 8 or 16, over PROFIsafe. It reaches Performance Level e per ISO 13849-1 and SIL 3 per IEC 61508, reading safety sensors directly into a fail-safe PROFIBUS or PROFINET segment.

Technical Specifications

Selection Notes

The 8/16 F-DI designation means the module can be configured for 8 or 16 fail-safe inputs depending on channel grouping; pick the 16-input configuration when wiring density on the ET 200pro station is the limiting factor. At PL e / SIL 3 it is rated for the highest commonly specified safety integrity level, so it fits emergency-stop and guard-monitoring circuits without adding external safety relays. Its 90 mm module width is wider than the standard 45 mm ET 200pro I/O modules because of the redundant safety logic inside.

Applications

F-DI modules like this one typically monitor emergency-stop pushbuttons, safety light curtains and guard-door switches on machinery where the safety function is decided close to the field device rather than in a central safety controller. Because the PROFIsafe telegram carries both the process value and its safety checksum over the same standard bus, the 16 inputs are wired straight into the ET 200pro station without a dedicated safety cable run back to the controller.