Section 5 Operator Interface SIL considerations3BSE042835-600 77SIL considerationsAccess LevelThe Access Level defines the rules for changing online values of a running SILapplication.Access Level shall be configured on parameters used for interaction in faceplates ofSIL1-2 and SIL 3 marked types.For variables and parameters of simple data type the Access Level shall beconfigured on the variable/parameter (configured in the object type). For variablesand parameters of structured data type, typically InteractionPar, the Access Levelshall be configured on the variable/parameter and on the data type components.Only variables/parameters (or their components) used for interaction shall beconfigured. The Access Level shall be set to Confirm. Other components, types,parameters, and variables shall not be configured and will keep the default AccessLevel 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 willbe the setting for the whole path.This means that the Access Level for sub-object instances shall be overridden toConfirm in case the sub-objects have a faceplate with interaction.
