DeltaV SIS hardware

A DeltaV automation system consists of carriers, one or more I/O subsystems, controllers, power supplies, workstations, and a control network.

DeltaV SIS hardware consists of:

• Logic Solvers (SLS 1508) and termination blocks

• SISNet Repeaters

• SISNet Distance Extenders

• Carrier extender cables

• Local peer bus extender cables

• Right one-wide carrier with termination

Logic Solvers (SLS) 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 Solvers and termination blocks install on the 8-wide carrier. DeltaV SIS systems supports simplex and redundant Logic Solvers. Logic Solvers communicate with each other through the carriers over a two-channel, local peer bus and remote peer 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 24VDC 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. Simplex Logic Solvers use two slots and redundant Logic Solvers use four slots.

SISNet Repeaters extend communication beyond the local Logic Solvers connected to one DeltaV controller and broadcast global messages to remote Logic Solvers through a fiber-optic ring. Global messages refer to messages that are intended for all Logic Solvers. The SISNet Repeater installs on a 2-wide carrier. There is a primary and secondary SISNet Repeater on each carrier.

SISNet Distance Extenders convert multimode fiber-optic signals to single mode fiber-optic signals to allow SISNet Repeaters to communicate over greater distances. Depending upon the installation, the remote peer ring can be extended by an additional 20 km when single mode fiber-optic cable is used.

Carrier extender cables extend LocalBus power and signals between 8-wide carriers. Local peer bus extender cables extend the local peer bus between Logic Solvers on different carriers. One-wide carriers with terminators terminate the local peer bus at the final carrier.

The figure shows carrier extender cables and local peer bus extender cables connecting a DeltaV controller and 8-wide carrier with standard DeltaV I/O and DeltaV SIS components to a second 8-wide carrier (hosted by the same controller) installed with Logic Solvers, SISNet Repeaters, and a terminated one wide carrier. Logic Solver messages are communicated to a remote DeltaV SIS system (hosted by a separate controller) through multimode fiber-optic cables.