ARC – The REXYGEN system archive

Block SymbolLicensing group: STANDARD

Function Description
The ARC block is intended for archives configuration in the REXYGEN control system. The archives can be used for continuous recording of alarms, events and history trends directly on the target platform. The output Archives of the EXEC block must be connected to the prev input of the first archive. The following archives can be added by connecting the input prev with the preceding archive’s output next. Only one archive block can be connected to each next output, the output of the last archive remains unconnected. The resulting archives sequence determines the order of allocation and initialization of individual archives in the REXYGEN system and also the index of the archive, which is used in the arc parameter of the archiving blocks (see chapter 10). The archives are numbered from 1 and the maximum number of archives is limited to 15 (archive no. 0 is the internal system log).

The atype parameter determines the type of archive from the data-available-after-restarting point of view. The admissible types depend on the target platform properties, which can be inspected in the Diagnostics section of the REXYGEN Studio program after successful connecting to the target device.

Archive consists of sequenced variable-length items (memory and disk space optimization) with a timestamp. Therefore the other parameters are the total archive size in bytes asize and maximum number of timestamps nmarks for speeding-up the sequential seeking in the archive.

The frequency of writing values to disk can be influenced by the period parameter. For devices using flash memory or SD cards as a disk, it is not suitable to write values too often, therefore it is appropriate to set this parameter to a value in the order of minutes. Furthermore, it is possible to select a suitable source of time stamps with the timesrc parameter.

Input

prev	Input for connecting with the next output of the preceding archive or with the Archives output of the EXEC block in the case of the first archive	Long (I32)

Output

next	Output for creating sequences of archives by connecting to the prev input of the following archive	Long (I32)

Parameters

atype	Archive type $⊙$ 1	Long (I32)
	1 .... archive is allocated in the RAM memory (data is irreversibly lost after restarting the target device) 2 .... archive is allocated in backed-up memory, e.g. CMOS (data remains available after restarting the target device) 3 .... archive is allocated on a drive (data remains available in the file after restarting)
asize	Size of the archive in bytes $↓$ 256 $⊙$ 102400	Long (I32)
nmarks	Number of time stamps for speeding-up sequential seeking in the archive $↓$ 2 $⊙$ 720	Long (I32)
ldaymax	Maximum size of archive per day [bytes] $↓$ 1000 $↑$ 2147480000 $⊙$ 1048576	Large (I64)
period	Period of writing data to disk [s] $⊙$ 60.0	Double (F64)
timesrc	Source of timestamps $⊙$ 1	Long (I32)
	1 .... CORETIMER – technological time – at current tick 2 .... CORETIMER-PRECISE – technological time – at block execution 3 .... RTC – real time clock (wallclock) from operating system – at current tick 4 .... RTC-PRECISE – real time clock (wallclock) from operating system – at block execution 4 .... PFC – raw high precision time (PerFormanceCounter)

[Previous] [Back to top] [Up] [Next]