RSlogix 5000 ASCII processing

[Petr_Broza]

Hi guys,

I got barcode scanner, which give me each character as SINT (style is ASCII), I want to put all these characters in one string, which will be matching actual code (so if scanner gives me 'A' 'B' 'C' I want to get 'ABC' not decimal ascii interpretation '656667'). I tried to use CONCAT, which work only with string, so I used DTOS, which gives me decimal interpretation of ASCII character. So is there any way how to put these characters in string tag?

Thanks for any help

Petr

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Rslogix 5000, CompactLogix L24ER, Cognex DataMan 8050

 

[Petr_Broza]

Looks like I need more sleep. Solution is very simple, all it need is COP instruction, and copy all character to string. Didn't know I can copy operands with different data types (SINT to STRING).

 

[willxfmr]

Thanks for posting the solution. It may have turned out to be simple for you, but it was definitely over my head.



Will.

 

[Petr_Broza]

I don't know how it is possible it's working, cause even a Help for COP function says: "Important: the Source and Destination operands should be the same data type, or unexpected results may occur"
But actually it is right, unexpected result really occurred in good way.

 

[mellis]

Actually COP is very good at moving data between data types *when you don't want it to try and interpret the data in any way*. COP just copies the data bit for bit without regard for datatypes. Normally, if you COP a DINT to a REAL, expect garbage as a result. If that DINT happens to have data in REAL format in it, like from a Modbus message, then COP it to a REAL tag and it works.

 

[Jeev]

A STRING consists of a .LEN (DINT) and .DATA (Array of SINTS). I wrote a long-winded post here, but I'm hoping a single picture might be worth my thousand words

 

[Jeev]

Adding to that picture, here's a dodgy one, and a slightly less dodgy one.