Introducing series 9721 unmanaged switches with Atex and IECEx certifications, R. Stahl presents a networking product geared towards process plants with fast Ethernet infrastructure in hazardous areas. Series 9721 switches feature four FX ports for optical fibre cables with ‚op is‘ (inherently safe optical radiation) type of protection according to IEC EN 60079-28:2015, which is akin to electrical type ‚i‘ intrinsic safety. Connected lines can be plugged in and out even in explosive atmospheres in zone 1 and 2 (hot plugging). With a shutdown no longer required, changes or extensions to an installation become more cost-effective. Optical fibre cables are the best and most reliable solution for fast data communication especially in plants with distributed systems, where considerable distances must be bridged or where strong interference may be an issue. The switches themselves can be operated in zone 2, while their fast 100 Mbit/s optical ports connect field devices such as the Ethernet-enabled R. Stahl IS1+ remote I/O system in zone 1.
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