Fail-safe modules for I/O system

Siemens Simatic fail-safe I/O modules are suitable for many applications, including fire and gas equipment.


Siemens introduced three fail-safe modules for the SIMATICR ET 200iSP intrinsically safe distributed I/O system. The new modules 8F-DI Ex Namur, 4F-DO Ex 40mA/17.4V and 4F-AI Ex HART reportedly meet the high safety requirements in accordance with the relevant standards such as IEC 61508 to SIL 3, ISO 13849-1 to PLe. 

The modules are suitable for applications including emergency shutdown (ESD), boiler protection or fire and gas equipment. For fire and gas applications, the modules reportedly offer important Last valid Value and Energize-to-Trip diagnostics functions.

- Edited by Chris Vavra, Control Engineering,

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