LogFileCSV

 Function Block - Create a log file in CSV format for a list of variables.

Inputs

Input	Data Type	Range	Unit	Default	Description
LOG	BOOL				Variables are saved on any rising edge of this input.
RST	BOOL				Reset the contents of the CSV file.
LIST	DINT				ID of the list of variables to log (use VLID function).
PATH	STRING				Path name of the CSV file (PxMM flash memory, SD card, or Shared Directory).

Outputs

Output	Data Type	Range	Unit	Description
Q	BOOL			TRUE if the requested operation has been performed without error.
ERR	DINT			Error report for the last requested operation. 0 (zero) is OK.

Remarks

• 
  

• Calling this function can lead to missing several PLC cycles.
  Files are opened and closed directly by the target's Operating System.
  Opening some files may be dangerous for system safety and integrity.
  The number of open files may be limited by the target system.

• 
  

• • Opening a file may be unsuccessful (invalid path or file name, too many open files...).
    Your application has to process such error cases in a safe way.
  • File management may be not available on some targets.
    • See the OEM instructions for more information about available features.
  • Valid paths for storing files depend on the target implementation.
    • See the OEM instructions for more information about available paths.

• This function enables to log values of a list of variables in a CSV file.
  • On each rising edge of the LOG input, one more line of values is added to the file.
  • There is one column for each variable, as they are defined in the list.
• The list of variables is prepared using the KAS-IDE or a text editor.
  • Use the VLID function to get the identifier of the list.
• On a rising edge of the RST command, the file is emptied.
• When a LOG or RST command is requested, the Q output is set to TRUE if successful.
  • See What is the Difference between Q and OK? for more information.
• In case of error, a report is given in the ERR output.
  • Possible error values are:
    • 1 = Cannot reset file on a RST command.
    • 2 = Cannot open file for data storing on a LOG command.
    • 3 = Embedded lists are not supported by the runtime.
    • 4 = Invalid list ID.
    • 5 = Error while writing to file.
• Combined with real time clock management functions, this block provides a very easy way to generate a periodical log file.

This example shows a list and a program that log values everyday at 14h23m (2:23 pm) (see ).

FBD Language Example

FFLD Language Example

IL Language Example

(* MyLOG is a declared instance of LogFileCSV function block *)
Op1: CAL MyLOG (b_LOG, RST, LIST, PATH);
FFLD  MyLOG.Q
ST  Q
FFLD  MyLog.ERR
ST  ERR

ST Language Example

(* MyLOG is a declared instance of LogFileCSV function block *)
MyLOG (b_LOG, RST, LIST, PATH);
Q := MyLOG.Q;
ERR := MyLog.ERR;

See Also

VLID