Pilz PSS SB HYD, Basic license - Manual (Page 51)

5-3 Modular Block System: Hydraulic Presses
Administration data blocks DB015, DB016 and DB017
Data blocks DB015, DB016 and DB017 are permanently specified within
the Modular Block System (MBS).
These data blocks are common administration blocks for fault and
diagnostic data from the MBS standard function blocks and for block and
parameter data that is required internally.
The administration data block DB015 must always be installed when using
MBS standard function blocks. Administration data blocks DB016 and
DB017 are installed when necessary.
The administration data blocks must always be installed with their full
length of 1024 data words and they must always have read/write status.
NOTICE
Data blocks DB015, DB016 and DB017 should only be used as MBS
administration data blocks and not for other data.
Structure of the administration data blocks
The administration data blocks DB015, DB016 and DB017 have the same
structure.
Each standard function block in the user program has 5 data words
available in one of the administration data blocks. These data words are
used to back up the temporary flags from the standard function block (see
section entitled “Temporary flag range in MBS blocks”).
In each of the administration data blocks, the range DW0001 to DW1000
is divided into 5 blocks, each with 200 data words (see Fig. 5-1).