Siemens SINUMERIK 828D Turning, Function Manual

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P3: Basic PLC Program for SINUMERIK 840D sl
13.15 Programming tips with STEP 7
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
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13.15.2.3 POINTER or ANY variable for transfer to FC or FB
POINTER or ANY variable
With version 1 or later of STEP 7 it is possible to define a pointer or ANY in VAR_TEMP.
The following two examples show how an ANY can be supplied.
Example 1: Transfer ANY parameter via a selection list to another FB (FC)
Several ANY parameters are defined in an FB (FC). A specific ANY parameter must now be chosen from a
selection list for transfer to another FB (FC). This can only be done by means of an ANY in VAR_TEMP. 1 to 4
can be set in parameter "WhichAny" in order to select Addr1 to Addr4.
LAR1 ; //Retrieve pointer from instance DB
L DIW [AR1,P#0.0]; //Retrieve DB number
T #dbchr;
L DID [AR1,P#2.0]; //Offset part of pointer
LAR1 ;
OPEN DB [#dbchr]; //Open DB of variables
L B [AR1,P#40.0]; //Retrieve byte value using pointer with
//address offset 40
//ANY
L P##Addr1;
LAR1 ; //Retrieve ANY from instance DB
L DIB [AR1,P#1.0]; //Retrieve type
T #typ;
L DIW [AR1,P#2.0]; //Retrieve amount
T #Amount;
L DIW [AR1,P#4.0]; //Retrieve DB number
T #dbchr;
L DID [AR1,P#6.0]; //Offset part of pointer
LAR1 ;
OPEN DB [#dbchr]; //Open DB of variables
L B [AR1,P#0.0]; //Retrieve byte value using ANY
Note
Address register AR2 is used in the block. However, this address register AR2 is also used
for multi­instance DBs. For this reason, this FB should not be declared as multi-instance DB.
Code Comment
FUNCTIONBLOCK FB 100
CODE_VERSION1 //starting from STEP 7 Version 2 for deactivating the
//multi-instance DB
VAR_INPUT
WhichAny : INT ;
Code Comment