The SISNet Repeaters can be located anywhere on a local peer bus – between

the DeltaV Controller(s) and the terminated 1-wide carrier.

Remote Peer Ring: SISNet Repeaters hosted by one DeltaV controller communicate

with SISNet Repeaters hosted by a different DeltaV controller over a fiber-optic remote peer ring.

A local SISNet Repeater collects locally generated messages that have

been designated as global variables into a singlemessage and sends it to

the next SISNet Repeater in the ring.

Upon receipt of a message, the receiving SISNet Repeater broadcasts it on its local

peer bus (SISNet) and forwards the message to the next SISNet Repeater in the ring.

A global message is forwarded around the ring once. The primary SISNet Repeaters

form one fiber-optic ring and the secondary form a separate, independent ring.

Carrier extender cables and local peer bus extender cablesconnecting a DeltaV

controller and 8-wide carrier with standard DeltaV I/O and SLS 1508 Logic Solver

to a second 8-wide carrier (hosted by the same controller) are installed with

SLS 1508 Logic Solvers, SISNet Repeaters, and a terminated 1-wide carrier.