Detailed description
2.7 Structure and functions of the basic program
Basic logic functions: PLC Basic program powerline (P3 pl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
67
NCRunupTimeout
:=
S5T#50S;
BP parameters (to scan runtime):
l gp_par.UDInt; //=4,
l gp_par.UDHex; //=2,
l gp_par.UDReal; //=1 )
During PLC power-up, DB20 was generated with a length of 28 bytes:
DB 20
address data
0.0 123
2.0 456
4.0 789
6.0 1011
8.0 b#16#12
9.0 b#16#AC
10.0 1.234560e+02
The structure of the machine data used is specified in a UDT:
TYPE UDT 20
STRUCT
UDInt : ARRAY [0 .. 3 ] OF INT ;
UDHex0 : ARRAY [0 .. 15 ] OF BOOL ;
UDReal : ARRAY [0 .. 0 ] OF REAL
;
//Description as field, for
// later expansions
END_STRUCT;
END_TYPE
Note
ARRAY OF BOOL are always sent to even-numbered addresses. For this reason, an array
range of 0 to 15 must generally be selected in the UDT definition or all Boolean variables
specified individually.
Although only a REAL value is used initially in the example, a field (with one element) has
been created for the variable. This ensures that extensions can be made easily in the future
without the symbolic address being modified.
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