SCL FB Pointer as input?

Hello.

I have a DB with an array of structs, containing a lot of bits for diagnostics on my safety system. I'm about to create a small SCL program that can read out data for this.

I would like to make a Input on my block, where i can say P#DB200.dbx0.0 for the first array, then the nex could be P#DB200.dbx3.0, i can do that if i set the input as a Pointer.

But, how do i then do in the SCL, where i want to read from this adress and use it in a FOR Loop, where it looks at the Byte adress and counts up the bit address, something like:

For cnt 0 to 7 DO

db201.DX(5,cnt) := db200.DX(10,cnt)

where db200.DX(10,cnt) is the adress coming from the input pointer??

Greetings

Rasmus

Rasmus Balle

Hello.

I have a DB with an array of structs, containing a lot of bits for diagnostics on my safety system. I'm about to create a small SCL program that can read out data for this.

I would like to make a Input on my block, where i can say P#DB200.dbx0.0 for the first array, then the nex could be P#DB200.dbx3.0, i can do that if i set the input as a Pointer.

But, how do i then do in the SCL, where i want to read from this adress and use it in a FOR Loop, where it looks at the Byte adress and counts up the bit address, something like:

For cnt 0 to 7 DO

db201.DX(5,cnt) := db200.DX(10,cnt)

where db200.DX(10,cnt) is the adress coming from the input pointer??

Greetings

Rasmus

Hello.

This defines an ANY pointer in traditionally way - but is that nessecary? All i need is to input the start of the struct in the array, and then read from that adress - isn't there any easier solution? :) The input to the block stands as a pointer P#db200.dbx0.0 - but how can i use that dbx0.0 in the program? :)

Rasmus Balle

Hello.

This defines an ANY pointer in traditionally way - but is that nessecary? All i need is to input the start of the struct in the array, and then read from that adress - isn't there any easier solution? :) The input to the block stands as a pointer P#db200.dbx0.0 - but how can i use that dbx0.0 in the program? :)

Rasmus Balle

The pointer that comes out here, is as a DWORD, but i need bot access to the Byte and Bit adress.... :)

It should be decomposed and this is your task as programmer to do so.You can filter out the bit number with AND for DWORD and byte number by shift instructions.Good example still available here:

11981421_AnyPointer.txt ( 1 KB )

With many regards,
Hamid Hosseini

Rasmus Balle

Thanks - i will try that :)

Hello again.

I've tried this:

VAR_INPUT
DB_ANY : ANY; // Any-Pointer of the Data-Block

AnyPointer AT DB_ANY : STRUCT
BYTE0 :BYTE; // Byte 0
TYP :BYTE; // Byte 1 Data-/Parametertype
ANZ :WORD; // Byte 2+3 Lenth of data
DBNO :WORD; // Byte 4+5 DB-Number
BZ :DWORD; // Byte 6 to 10 Pointer
END_STRUCT;

tmpAnyPointer AT DB_ANY : ARRAY [0..9] OF BYTE;

END_VAR

In TIA Portal V13, but i can't define the struct for the any pointer... If i do like this in t he "Top" bar:

Input: DB : Pointer

Temp pointer AT DB : Struct

BYTE0 :BYTE; // Byte 0
TYP :BYTE; // Byte 1 Data-/Parametertype
ANZ :WORD; // Byte 2+3 Lenth of data
DBNO :WORD; // Byte 4+5 DB-Number
BZ :DWORD; // Byte 6 to 10 Pointer
END_STRUCT;

Nothing happens, it just creates adresses after the other... :/