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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.

The redundant SLS 1508 Logic Solver modules are connectedto the field at the redundant

terminal block. No control strategy configuration is required to take advantage

of SLS 1508 Logic Solver redundancy, as the system’s auto-sense capability

automatically recognizes the redundant pair of Logic Solvers.

An integrity error alarm in a redundant SLS 1508 Logic Solver pair will notify

the operator of a failure. Both SLS 1508 Logic Solvers in a redundant pair

are monitored for integrity alarms at all times.

Events that can cause integrity alarms include:

• Hardware failure within a SLS 1508 Logic Solver

• Communications failure between a SLS 1508 Logic Solver and the SISNet

• Communications failure between a redundant pair of SLS 1508 Logic Solvers

• Communications failure between a SLS 1508 Logic Solver and an DeltaV Controller

• Removal of a SLS 1508 Logic Solver from the carrier

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