ST_BA_SeqLink / ST_BA_SeqLinkData

Structure of the data and command exchange between the control function block FB_BA_SeqLink and the sequence controllers FB_BA_SeqCtrl.

This structure has to be created once per sequence control:

stSeqLink : ST_BA_SeqLink;

Within this structure, a further field structure is declared automatically, through which the sequence link function block and the individual sequence controllers exchange all relevant data. Each sequence controller writes its data into the field element corresponding to its ordinal number (entry at input diMyNum at the sequence controller function block). It is always the complete structure with all field elements that is linked to the function blocks.

The structures have the following setup:

TYPE ST_BA_SeqLink :
STRUCT
  arrSeqLinkData : ARRAY[1..16] OF ST_BA_SeqLinkData;
  diCurCtrl      : DINT;
  bSeqActv       : BOOL;
END_STRUCT
END_TYPE

arrSeqLinkData: Parameters of the individual sequence controllers. See below for a description of the structure ST_BA_SeqLinkData.

diCurCtrl: from FB_BA_SeqLink: Specification of current sequence controllers.

bSeqActv: The sequence control is enabled and active.

TYPE ST_BA_SeqLinkData:
STRUCT
  lrY         : LREAL;
  lrYMin      : LREAL;
  lrYMax      : LREAL;
  lrW         : LREAL;
  bActn       : BOOL;
  bOp         : BOOL;
  bPresence   : BOOL;
  bErrDouble  : BOOL;
  diCurCtrl   : DINT;
END_STRUCT
END_TYPE

lrY: from FB_BA_SeqCtrl: Transfer of current control value.

lrYMin: from FB_BA_SeqCtrl: Transfer of minimum control value.

lrYMax: from FB_BA_SeqCtrl: Transfer of maximum control value.

lrW: from FB_BA_SeqCtrl: Transfer of current set value.

bActn: from FB_BA_SeqCtrl: Transfer of inverse direction of action (bActn = FALSE: heating mode - bActn = TRUE: cooling mode).

bOp: from FB_BA_SeqCtrl: Sequence controller is enabled, i.e. its input bEn is set to TRUE.

bPresence: from FB_BA_SeqCtrl: Checkbit, see below

bErrDouble: from FB_BA_SeqCtrl: Error during number verification: Two or more sequence controllers exist with the same ordinal number diMyNum.

diCurCtrl: from FB_BA_SeqLink: Specification of current sequence controllers.