(SLS 1508) contain the logic-solving capability and provide an interface
to 16 I/O channels that can be configured as Discrete Input, Discrete Output, Analog Input
(HART) and HART two-state output channels. Logic Solversand termination blocks
install on the 8-wide carrier.
Logic Solvers communicate with each other through thecarriers over a two-channel,
local peer bus (SISnet) and remotepeer ring. Local Logic Solvers are hosted by the same DeltaV
controller and remote Logic Solvers are hosted by a different DeltaV controller.

Logic Solvers are powered by a 24 V DC power supply that is separate from the
power supply that drives the DeltaV controller and I/O. Logic Solvers install
in odd-numbered slots (1.3.5.7) on the 8-wide carrier.
Redundant Logic Solvers use four slots.
SISNet Repeaters extend communication beyond the localLogic Solvers connected
to one DeltaV controller and broadcast global messages to remote
SLS 1508 Logic Solvers through a fiber-optic ring Carrier extender cables
extend Local Bus power and signals between 8-wide carriers.
Local peer bus extender cables extend the local peer bus (SISNet) between
SLS 1508 Logic Solvers on different carriers. 1-wide carrierswith terminators
terminate the local peer bus at the final carrier. For additional information
please consult DeltaV SISNet Repeater product datasheet.
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.
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