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Entry type: Product note Entry ID: 109761426, Entry date: 10/17/2018

Optical connection in and through ATEX/IECEx Zone 1 or 21

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Optical connection in and through ATEX/IECEx Zone 1 or 21

You can connect communication nodes in an ATEX/IECEx Zone 1 or 21 to your network via an optical connection. Additionally, you can conduct optical connections through an ATEX/IECEx Zone 1 or 21. 

The requirements for the aforementioned applications are set out in EN/IEC-60079-28. The devices that comply with the standard were previously marked with "Ex nA [op is Gb] IIC T4 Gc". 

A change to this standard in the 2015 version excludes devices with optical transceivers that comply with the limit values of Class 1 according to IEC 60825-1 from this regulation. 

The suitability of SIMATIC NET devices with corresponding Class 1 laser transceivers has been reviewed by the DEKRA certification authority and incorporated into the certificate with regard to explosion protection. A corresponding list is also included in this certificate. 109475778


Devices with an x in the "Fiber outputs Laser Class 1" column can be used to optically connect nodes in or through ATEX/IECEx Zone 1 and 21:


Note: The devices themselves being used can only be used in the respective zones for which a certificate has been issued. Zone 1 corresponds to Category 2G, Zone 2 to Category 3G, and Zone 21 to Category 2D.

Since SCALANCE SFPs fulfill these requirements, all devices with the corresponding ATEX/IECEx certification and SFP slots, such as SCALANCE XC206-2SFP, can be used for these applications.

Note: The SCALANCE devices themselves can only be used in Zone 2, providing they have the corresponding ATEX/IECEx certification. 

An example configuration for the applications described is shown below.


The new certificate does not conflict with existing EN/IEC 60079-28 certifications with the marking "Ex nA [op is Gb] IIC T4 Gc" on the devices. The certificate is valid for the period stamped on the rating plate.


Contact for technical issues: Customer Support, DF CS SD CCC TS, contact form http://www.siemens.com/automation/support-request

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