Emerson CL6821 Analog l/0 Card

While the SLS 1508 Logic Solver is rated suitable for use in SIL 3 applications

in simplex mode, it is installed in redundant pairs for increased process availability.

Redundant SLS 1508 Logic Solvers run in parallel at all times.Both read the inputs

from the I/O terminals, both execute the logic and both drive the outputs at the I/O terminals.

There is no concept of primary and backup or master and slave,which is unlike any other SIS.

The only difference between the two is that one communicates with both the engineering

and operator workstations and the dedicated safety network (SISNet);

this is the one with the Active light on the bezel.The other (Standby) is

communicating only on the SISNet.In the event that a failure is detected in

one of the SLS 1508 Logic Solvers, it automatically goes to a failed state. 

In this condition, all its output channels are de-energized;

this has no impact on the other SLS 1508 Logic Solver or the physical

outputs because the other SLS 1508 Logic Solver continuesto read inputs

execute logic and drive outputs. The transition from redundant to simplex

mode is therefore completely bumpless.

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.

The health and status of both SLS 1508 Logic Solvers and their channels are

available in the diagnostics explorer.

When one of a redundant pair of SLS 1508 Logic Solversis removed online there

is no disturbance to the process.

When the missing SLS 1508 Logic Solver is replaced with another SLS 1508 Logic Solver,

the new SLS 1508 Logic Solver completes its power-up self-tests before the

active Logic Solver cross-loads the current database.

In safe areas, failed SLS 1508 Logic Solvers can be replaced under power.

In hazardous areas,appropriate installation procedures must be followed.

Automatic proof testing can be selected on a redundant pairof SLS 1508 Logic Solvers.

The desired proof-test interval is set in the configuration and the SLS 1508 Logic Solvers perform

the proof test automatically. A warning is given to the operator before

the automatic proof test is started.

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