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I try to read "Real values" from a .txt files (~5000 parameters), directly on the Flash card of my Rexroth PLC. I can open it with SysFileOpen and I can read value from it with SysFileRead but, i received information in Byte... So in place to have 20 different positions, I have data in Byte, so maybe an array of 100 bytes...
Is it possible to read directly the different real positions and store it in a array of real?
Thank you for your help,
Bests regards,
Fred
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In fact, the SysFileRead, take the byte value of every digit. For example in .csv file: the value to read is -0,013, first line. I will have finally in my "buffer":
and then '$R' and '$N' for Return and New line.
After I transform the byte in ascii with a IL_Byte_to_Ascii (something like that, I don't remember the right name). Present in Library of codesys.
Then you use a CONCAT for several digit (used '$R' and '$N' to stop concat). In the end you have a string with the value '-0,013'. You can use now the conversion string_to_real in order to have the real value.
PAY ATTENTION that with a ',' (comma) the conversion string_to_real will not work, you MUST have '.' (point).
'-0.013' will give -0.013 in the real value.
Until now I didn't find something faster to read a real in a . csv or .txt...
Regards,
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the comma and the dot are language dependent, i would follow the english version, easier as you can not change the comma in a CDF.
have a look into the oscat library.
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Hello,
I try to read "Real values" from a .txt files (~5000 parameters), directly on the Flash card of my Rexroth PLC. I can open it with SysFileOpen and I can read value from it with SysFileRead but, i received information in Byte... So in place to have 20 different positions, I have data in Byte, so maybe an array of 100 bytes...
Is it possible to read directly the different real positions and store it in a array of real?
Thank you for your help,
Bests regards,
Fred
what about STRING_TO_REAL
Hello,
In fact, the SysFileRead, take the byte value of every digit. For example in .csv file: the value to read is -0,013, first line. I will have finally in my "buffer":
and then '$R' and '$N' for Return and New line.
After I transform the byte in ascii with a IL_Byte_to_Ascii (something like that, I don't remember the right name). Present in Library of codesys.
Then you use a CONCAT for several digit (used '$R' and '$N' to stop concat). In the end you have a string with the value '-0,013'. You can use now the conversion string_to_real in order to have the real value.
PAY ATTENTION that with a ',' (comma) the conversion string_to_real will not work, you MUST have '.' (point).
'-0.013' will give -0.013 in the real value.
Until now I didn't find something faster to read a real in a . csv or .txt...
Regards,
the comma and the dot are language dependent, i would follow the english version, easier as you can not change the comma in a CDF.
have a look into the oscat library.
You can also try this.
A real number has 32bits in Codesys. So you can try the following:
Read your real number, using SysFileRead, into a variable declared in the memory (eg. %MD8200), in double word (DWORD) format.
Declare a real variable at the same marker address (eg. %MD8200) and you have got your real number.
Example:
BufferDWord AT %MD8200:DWORD;
BufferReal AT %MD8200:REAL;
BufferDWord=SysFileRead(...);
YourRealNumber=BufferReal;
Regards,
Lucian