Section 5 Operator Interface SIL considerations
3BSE042835-600 77
SIL considerations
Access Level
The Access Level defines the rules for changing online values of a running SIL
application.
Access Level shall be configured on parameters used for interaction in faceplates of
SIL1-2 and SIL 3 marked types.
For variables and parameters of simple data type the Access Level shall be
configured on the variable/parameter (configured in the object type). For variables
and parameters of structured data type, typically InteractionPar, the Access Level
shall be configured on the variable/parameter and on the data type components.
Only variables/parameters (or their components) used for interaction shall be
configured. The Access Level shall be set to Confirm. Other components, types,
parameters, and variables shall not be configured and will keep the default Access
Level Read-Only. When the system evaluates the Access Level for an OPC property,
the whole path is evaluated and the most restrictive setting found along the path will
be the setting for the whole path.
This means that the Access Level for sub-object instances shall be overridden to
Confirm in case the sub-objects have a faceplate with interaction.
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