Communication via Function Blocks
6.4 Programming the Function Blocks
Point-to-point connection CP 440 Installation and Parameter Assignment
104 Manual, 09/2007, A5E00057742-03
Example of "Indirect Parameter assignment"
Call of the FB 10 corresponding to indirect parameter assignment:
STL
Network 1:
CALL
FB 10, DB10
REQ := M 0.6 //Activates SEND
R := M 5.0 //Activates RESET
LADDR := MW21 //Basic address in MW21
DB_NO := MW40 //DB no. in MW40
DBB_NO := MW42 //DBB No. in MW42
LEN := MW44 //Length in MW44
DONE := M 26.0 //Terminated without error
ERROR := M 26.1 //Terminated with error
STATUS := MW 27 //Status word
Parameter assignment of Data Words
The specification of data words (partially qualified specification) is not allowed because
(depending on the actual operands) the currently selected data block can no longer be
determined in the standard function. If a data operand is specified as an actual parameter,
the fully qualified specification must always be used.
A fully qualified specification can be either absolute or symbolic. Mixed addressing with fully
qualified data operands is rejected by the compiler.
Example 1
The symbol name for the data block is entered in the symbol table, while the symbol name
for the data operand is declared in the corresponding data block.
STL
DB 20.DBW 0 Absolute fully qualified addressing
CP_DB.SEND_DWNR Symbolic fully qualified addressing
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