Do someone have some sample to using POINTER TO STRUCT operand?

ex: I neeed to map a STRUCT of 32 BOOL to a DWORD (%MD)

Thanks

Here you go

VAR
   dwValue      : DWORD;
   pStruct      : POINTER TO DWORD;
   stMyStruct   : Test; // Struct with 32 Boolean variables
END_VAR

pStruct   := ADR(stMyStruct);
dwValue := pStruct^;

mmm..it doesn't work properly..
the code map like this bit->byte

stMyStruct --> dwValue
bit0=true --> Byte 0 =1
bit1=true --> Byte 1 =1
bit2=true --> Byte 2 =1
bit3=true --> Byte 3 =1
bit4=true --> not mapped
bit5=true --> not mapped
...........

BOOL is byte packed in a structure so this will not work

so there's no way to map 32-BOOL-structure to DWORD

sort of...if you can modify the original structure and want to recreate a structure each time with different fixed memory addresses. See the following post

http://forum.codesys.com/viewtopic.php?f=1&t=4783

Also if you need help with address use the attach excel sheet.

Also the following below will work if you are using CoDeSys v3 and do not want to use fixed addressing. In CoDesys V3 they added BIT Type and Unions but which not part of the original IEC61131 spec.

TYPE DUT_16bit :
STRUCT
BIT00 :BIT; //Boolean Type
BIT01 :BIT; //Boolean Type
BIT02 :BIT; //Boolean Type;
BIT03 :BIT; //Boolean Type
BIT04 :BIT; //Boolean Type
BIT05 :BIT; //Boolean Type
BIT06 :BIT; //Boolean Type
BIT07 :BIT; //Boolean Type
BIT08 :BIT; //Boolean Type
BIT09 :BIT; //Boolean Type
BIT10 :BIT; //Boolean Type
BIT11 :BIT; //Boolean Type
BIT12 :BIT; //Boolean Type
BIT13 :BIT; //Boolean Type
BIT14 :BIT; //Boolean Type
BIT15 :BIT; //Boolean Type
END_STRUCT
END_TYPE

TYPE DUT_REG16 :
UNION
Reg_Word: WORD;
Reg_BITS: DUT_16bit;
END_UNION
END_TYPE

SoM Modbus Table V3.xls [409 KiB]