Definition of Persistent Variables Single variables as well as structure instances and function block instances can be marked as "persistent" by the use of attributes. When an instance is marked, all

Data Storage The storage of persistent variables can be triggered in various ways: Each persistence channel provides an application interface which can be used by the application to trigger a storage

Storage Format There are two implementations of the interface IDataStorage available: ASCIIDataStorage and BinaryDataStorage . In both formats the first variable which is stored is the reserved variab

Data Access The Persistence Manager provides up to 10 submodule instances of type PersistenceChannel. Each persistence channel provides a submodule instance of type DataStorage which is responsible fo

Diagnosis Each persistence channel has a submodule which allows data access (interface IDataStorage ). The following outputs provide diagnostic information: Output Data Type Description xActionOngoing

DataLog Manager The DataLog Manager is a standard component of the Application Composer. It serves for cyclic storage of variable values into a file. These variables are flagged with special attribute

Module: DataLog Manager The DataLog Manager manages the data logging of variables. It can be added to the module tree below the upper most object . This is done by the Add Toplevel Instance command an

Module: DataLog Channel The DataLog Channel module is used to define groups for the variable storage. The module can be added below the Datalog Manager node. This is done by the Add Submodule Instance

Module: DataLog Storage CSV The submodule DataLogStorage_CSV defines the storage format of a DataLog channel as CSV file. It can be added below a DataLog channel node. This is done by the Add Submodul

Command: Add Toplevel Module Instance This command (category "Composer") opens the Module dialog which offers all top level modules which can be added to the module tree. There is no limitation to the