Emerson DeltaV SIS™ Safety Network Components GSN Description

GSN Description and Specification

Multiple LSNs can be connected using LSNBs. The LSNBs are

physically connected as a star topology (GSN does not support

network ring topologies). Starting with to v14.LTS and later,

the GSN can be logically separated in domains. A GSN domain

is a logical group of LSNs.

Refer to the latest DeltaV SIS Installation and Planning Guide

for details of network layouts and network cable shielding

requirements and power and grounding requirements for

the overall DeltaV SIS system.

For Use in SIL 3 Applications

The GSN is certified for use in SIL 3 applications.

Wiring

The GSN requires the use of ScTP cable for the 100/1000 BaseT/

TX safety network.

The maximum twisted-pair cable length for the GSN for any

LSNB is 100 meters (328 feet).

The LSNB contains Ethernet ports to provide the redundant

communication for both the LSN and GSN.

Fiberoptic Wiring

Ethernet on the LSNB carrier are available for copper

only. DeltaV SIS Smart Switches can be connected using

fiberoptic cables.

Because fiberoptic cables do not conduct electricity,

they should be used in connections between buildings

or in plant areas where electromagnetic interference is present.

Fiberoptic cabling must be used where cable runs are longer

than 100 meters (328 ft.).