The SZ controllers and CSLSs can be physically connected
as a star topology (the LSN does not support network
ring topologies).
Starting with DeltaV SIS v13. the LSN Bridge (LSNB) allows
communication across multiple LSNs. The LSNB connect
to the LSN following a star topology.
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.

The local safety network (LSN) is the communication backbone
of the DeltaV SIS™ process safety system. The LSN is a standard
Ethernet network dedicated to the DeltaV SIS system that
enables communication between CHARMs smart logic solvers
(CSLS) and a single SZ controller. The CSLSs communicate
secure parameters and input data to other CSLSs over the LSN.
SZ controllers connect to both the area control network and
the LSN to isolate the CSLSs from the process control system.
Starting with v13. the global safety network (GSN) enables
safety-rated communication among LSNs while allowing
functional segregation on different LSNs. A typical example is
separation of fire and gas (F&G) and emergency shutdown
(ESD) applications over separate LSNs while allowing safe and
secure communication across both applications. Starting with
v14.LTS, the GSN can be logically separated in domains which
are a group of LSNs.

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