Year: 2026

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.

Communication

Control Network: The DeltaV Control Network provides communication 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.

Product Description

This section provides general information on DeltaV SIS hardware. Refer to the Installing

Your DeltaV Distributed Control System manual for more information on DeltaV system hardware.

DeltaV SIS Hardware

The DeltaV SIS process safety system consists of the following hardware:

• Redundant Logic Solvers (SLS 1508) and termination blocks

• SISNet Repeaters (see separate product data sheet)

• Carrier extender cables

• Local peer bus extender cables

• Right 1-wide carrier with termination

Logic Solvers (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.

Easy Compliance with IEC 61511. IEC 61511 demands rigorous user

management and the DeltaV SIS process safety system provides it.

IEC 61511 requires that any changes made from an HMI (e.g. to a trip limit)

be extensively vetted to ensure that the right data is written to the right Logic Solver.

The DeltaV SIS process safety system automatically provides this data verification.

Scales to fit any size application. Whether you have anisolated wellhead

or a large ESD/fire and gas application, the DeltaV SIS process safety system

scales to provide you with the safety coverage you need for your SIL 1. 2 and 3 safety

functions. Each SLS 1508 Logic Solver has dual CPUs and sixteen channels

of I/O built into it. This means that no additional processors will ever be required

to expand the system, since each Logic Solver contains its own CPUs.

Scan rate and memory usage are constant and independent of system size.

SIL 3-rated. DeltaV SLS 1508 Logic Solvers are installed inredundant pairs for

increased process availability of your SIS loops.

Redundant architecture includes:

• Dedicated redundancy link

• Separate power supply to each Logic Solver

• I/O published locally every scan on redundant peer-to-peer link

• Same input data for each Logic Solver

Cybersecurity readiness. In an increasingly connected world,cybersecurity rapidly

became an integral part of every process safety project. Building a defendable

architecture is the basisfor achieving a defendable safety system.

DeltaV SIS when deployed with DeltaV DCS was the first process safety system

to be certified according to ISA System Security Assurance (SSA) Level 1. based on IEC 62443.

Benefits

The World’s first smart SIS. Research shows that over 85% of all faults in SIS

applications occur in field instruments and final control elements.

The DeltaV SIS process safety system has the first smart logic solver.

It communicates with intelligent field devices using the HART protocol

to diagnose faults before they cause spurious trips. This approach increases

process availability and reduces lifecycle costs.

Flexible deployment. Traditionally, process safety systems have been deployed

either separate from the control system or interfaced to control systems via

engineered interfaces based on open protocols (e.g. Modbus).

However, most end users require a higher integration for configuration,

maintenance, and operations environment. DeltaV SIS can be deployed

either as interfaced to any DCS or integrated with DeltaV DCS.

Integration is accomplished without scarifying functional separation as safety

functions are implemented in separate hardware, software, and networks

while being seamlessly integrated at the workstations.

Introduction

The DeltaV SIS™ process safety system, part of Emerson’s smart SIS, ushers in the next

generation of Safety Instrumented Systems (SIS). This smart SIS approach uses the

power of predictive field intelligence to increase the availability of the entire safety

instrumented function.

Sequence of Events Capability

With DeltaV SIS process safety system, events are automatically generated as

function blocks are executed within a module scan. Events are time stamped 

with a resolution of <1 ms,and they are recorded in the sequence that they occur in the

Event Chronicle. When using standard function blocks such as input blocks,

|voter blocks, and cause and effect blocks, a standard set of events are

automatically generated without special configuration or programing required.

For example,I/O failures, trip limits, first outs, and other similar events are automatically

time stamped by function blocks and recorded in the Event Chronicle.

When a process variable exceeds the trip limit, DeltaV SIS records the event along

with the analog value and the trip condition.

In general, when there is a plant event that triggers anemergency shutdown from the SIS,

one input will exceed a trip limit on one scan and this will cause outputs to trip and

more inputs will then change state. Sequence of Events Recording has been

used to find that first input that caused the trip by looking at all of the inputs in the plant.

With the DeltaV SIS system, the operator simply filters the Event

Chronicle for first out trips, and the first-out is clearly visible.

If higher resolution is required for some channels then they canbe wired to both

the DeltaV SIS Logic Solver and also to a DeltaV Discrete Input Card for Sequence

of Events, which provides a resolution of 0.25 ms.

Introduction

The DeltaV SIS™ process safety system, part of Emerson’s smart SIS, ushers in the next

generation of Safety Instrumented Systems (SIS). This smart SIS approach uses the

power of predictive field intelligence to increase the availability of the entire safety

instrumented function.

The DeltaV SIS™ platform is the world’s first smart process safety system to use

the power of predictive intelligence for increasing the availability of the entire

safety instrumented function.

DeltaV SIS™ Logic Solver

• World’s first smart SIS Logic Solver

• Flexible deployment

• Easy compliance with IEC 61511

• Scales to fit any size application

• SIL 3-rated

• Cybersecurity readiness

PCX Programming software allows these drives to be set up and running in a

matter of minutes. These drives are programmed with the same easy-to-use

PCX Programming Software used with standard FX Drives.

CE Mark FX Drives are also compatible with EMERSON Motion Control’s complete 

range of application modules. These modules provide FX Drives with additional hardware

and programming capacity to perform specificapplications.

Examples of these applications include press feed control, random infeed control,

phase synchronization control, and cam profiling control.

There are two methods of system wiring that meet or exceed the grounding and

shielding requirements set forth by the EMC Directive of CE. Both methods are demonstrated

in the diagram above.

The preferred wiring method utilizes special interconnection cables available from

EMERSON Motion Control. These cable components were specifically

designed to make use of a complete shield throughout multiple segments.

Connector backshells, bulkhead connectors and the cable itself work together

to reduce radiated emissions both inside and outside of the enclosure.

An alternate method allows for shielded motor feedback and power cable runs

inside metal conduit. This method is also effective in reducing radiated noise

and may be desired in some applications based on environmental conditions.

Regardless of wiring method chosen, power supply line and motor power filters are required.

Both are also available from EMERSON Motion Control.

Note that these servo systems are designed, configured and tested to meet

CE Mark specifications. In addition to the servo drives and motors,

EMERSON Motion Control also offers filters and cables that satisfy

compliance of the entire servo drive system.

FX Drives with the CE Mark designation have the same features and performance

specifications as EMERSON Motion Control’s popular FX Drives.

PCX Programming software allows these drives to be set up and running in a

matter of minutes. These drives are programmed with the same easy-to-use

PCX Programming Software used with standard FX Drives.

CE Mark FX Drives are also compatible with EMERSON Motion Control’s complete 

range of application modules. These modules provide FX Drives with additional hardware

and programming capacity to perform specificapplications.

Examples of these applications include press feed control, random infeed control,

phase synchronization control, and cam profiling control.

Recently, the use of individual control products in Europe requires conformance

to standards recognized by the European Union (EU) member states.

These standards were designed to allow quick and fair market access throughout

the EU. The Electro-Magnetic Compatibility (EMC), directive – 89/336/EEC,

requirement placed on vendors is one of the toughest standards

regulating electromagnetic emissions and noise immunity.

Briefly, the EMC Directive states that components, such as servos, are considered

small portions of larger machines and therefore may not need individual compliance.

It would then be the machine builder’s responsibility to conform to the EMC Directive

for machines going into Europe. This approach, taken by many servo manufacturers,

places compliance burden completely on the machine builder.

Product testing by the machine builder will therefore be an excessively large expense.

The fact that EMERSON Motion Control products already posses the CE Mark is a distinct

advantage for machine builders. New models in our popular FX Drive series cover continuous

torque ratings ranging from 8 to 120 lb-in.

These models  include the FX-208CE through the FX-6120CE.