Hello,

System specifications:
- Simatic PCS7 V7.0 + SP3
- Simatic Manager V5.4 + SP3 + HF7
- Simatic S7-SCL V5.3 + SP5

I’m trying to achieve 2 goals:
- Working SCL code to read a STRING[16] from DB
- Working SCL code to write a STRING[16] to DB

A string value can be filled in an input field on the display. The WinCC input is connected with the FB input in CFC. The meaning is to temporary store the input string values in a data block, and that's what the FB should do. The DB memory places STRING[16] are allready created. I just can’t figure out how to solve this one despite all the info on the Siemens automation site.

For example:

- BOOLEAN read from/write to DB (working)

//read BOOL from DB

GR_TOEL1 := WORD_TO_BOOL(WORD_TO_BLOCK_DB(INT_TO_WORD(ADDR1_VISU)).DX[(ADDR2_VISU+100),2]);

//write BOOL to DB

WORD_TO_BLOCK_DB(INT_TO_WORD(ADDR1_VISU)).DX[(ADDR2_VISU+100),2] := GR_TOEL1

- INTEGER read from/write to DB (working)
//read INTEGER from DB
GEW_BWH_A := WORD_TO_INT(WORD_TO_BLOCK_DB(INT_TO_WORD(ADDR1_TRF_A)).DW[(ADDR2_TRF_A+120)]);

//write INTEGER to DB
WORD_TO_BLOCK_DB(INT_TO_WORD(ADDR1_TRF_A)).DW[(ADDR2_TRF_A+120)] := INT_TO_WORD(Q_ACTGEW_A);

- STRING[16] read from/write to DB (can’t fix)

//so i want to read the STRING[16] stored in DB30.DBB10170 but don't know how
//and also want to write a STRING[16] value to DB30.DBB10170. ??

Your help is highly appreciated. Thanks in advance.

Hi No Name,

Thanks for your reply. I prefer to store as a string format instead of another data type. Those strings are also transferred to process history data, as a string.

On CFC level it's possible to send a string to DB, as explained here. Also see attached file with jpg's. This way it's possible to read from and write to DB.

The used SCL code in this example looks like;
///////////////////////////////////////////////////////
FUNCTION_BLOCK FB1167

TITLE = 'IN_OUT_STR'
VERSION : '1.0'
AUTHOR : *****
NAME : IN_OUT_STR
FAMILY : ******

{S7_m_c :='true'}

VAR_INPUT
I_STR : STRING[16]:='0';
END_VAR

VAR_OUTPUT
Q_STR : STRING[16]:='0';
END_VAR

BEGIN
Q_STR := I_STR;
END_FUNCTION_BLOCK
////////////////////////////////////////////////////////

However, I have thousands of STRING[16] values to temporary store in DB's so I want the populate those DB's directly with use of SCL so I can target the addresses in the code.

But how do I store a string value in DB using SCL?Maybe the any-pointer is a possibility, I'm not familiar with that. Do you have a working example? Thanks a lot.