s7 1200 indirect addressing using real data type

[Rob.Hill]

Hi,

Im new to SCL, but decided to start learning it - if only to be able to do some simple jobs such as indirect addressing.

got some simple code to manipulate a local temporary register:

IF "Tonnage_Data".Cycle_Complete_Hour_Stamp=5 THEN
#East_Byte_Offsett_Address:= (#East_Current_Skip_Number_Converted-1) * 4 + 1318; // Calculating Dynamic Offsett Address To Tonnage Data DB
END_IF;

IF "Tonnage_Data".Cycle_Complete_Hour_Stamp=6 THEN
#East_Byte_Offsett_Address:= (#East_Current_Skip_Number_Converted-1) * 4 + 1414; // Calculating Dynamic Offsett Address To Tonnage Data DB
END_IF;

IF "Tonnage_Data".Cycle_Complete_Hour_Stamp=7 THEN
#East_Byte_Offsett_Address:= (#East_Current_Skip_Number_Converted-1) * 4 + 1510; // Calculating Dynamic Offsett Address To Tonnage Data DB
END_IF;

The above carries on, but follows the same theme.
I had hoped to use the #East_Byte_Offsett_Address as the ByteOffsett within the POKE command.

However the POKE command cannot transfer data types of real!

Hopefully someone has a suggestion of indirect addressing a real value?

Thanks

 

[Thomas_v2]

Hi,

you have to add the datatype to the POKE function. But there are only binary types possible, like POKE_BYTE, POKE_WORD, POKE_DWORD.
For real values you need an explicit typeconversion.

#realValue := DWORD_TO_REAL(PEEK_DWORD(area := 16#84, dbNumber := 42, byteOffset := #East_Byte_Offsett_Address));

should do the job.

 

[L D[AR2P#0.0]]

Why not declare the DB using arrays etc and then use SCL to access data form the arrays by index. The SCL you have written should be ditched.

 

[Rob.Hill]

Thanks for the answer guys, I ended up using something very similar to Thomas V2 suggestion

Cheers