Diagnosis

Each persistence channel has a submodule which allows data access (interface IDataStorage). The following outputs provide diagnostic information:

Output	Data Type	Description
`xActionOngoing`	`BOOL`	`TRUE` if the Persistence Manager reads or writes data
`udiDataMemSize`	`UDINT`	Data size of the persistent data in bytes
`xReadingDone`	`BOOL`	Reading of persistent data finished
`dtLastReading`	`DT`	Date and time of the last reading
`uiNumberVarsNotOk`	`UINT`	Number of variables which have not been read correctly
`uiNumberVarsOk`	`UINT`	Number of variables which have been read correctly
`tTimeForReading`	`TIME`	Time duration for reading
`dtLastSaving`	`DT`	Date and time of the last reading
`tTimeForWriting`	`TIME`	Time duration for writing
`uiWritingCycles`	`UINT`	Number of storages till start of application

The information about the number of variables read and about the success of the storage are also displayed in the PLC logger.

Figure 31. PLC logging¶