Emerson DeltaV SIS™ Logic Solver​ Communication

Communication

Control Network: The DeltaV Control Network providescommunication between

the nodes in the DeltaV network.Refer to the Installing Your DeltaV Digital

Automation Systemmanual for complete information on the Control Network.

Local Bus: The Local Bus provides communication between DeltaV controllers

and SLS 1508 Logic Solvers and between DeltaV controllers and SISnet Repeaters.

Local Peer Bus (SISNet): SLS 1508 Logic Solvers communicatewith other SLS 1508

Logic Solvers and with local SISNet Repeaters through the carriers over

a 2 channel local peer bus.

The same message is broadcasted over both channels. The localpeer bus must

be terminated at both ends. The local peer bus is terminated at the left

end through the 2-wide power/controller carrier and at the right end

through a terminated 1-wide carrier.

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.

SLS 1508 Logic Solver messages are communicated to a remote SLS 1508 Logic Solver

(hosted by a separate controller) through fiber-optic cables.

Multiple Domains: The simplest implementation of an SLS 1508 network is to have

one SIS Network ring and one SIS Network domain, that includes all of the

logic solvers in the SIS Network ring. In larger applications, the logic solvers

can be split into multiple SIS Network domains. Another approach is to have

multiple SIS Network rings, each on a SIS Network domain.