VLID

 Function - Gets the identifier (ID) of an embedded list of variables.

• 
  
• • List files are read at compiling time and are embedded into the downloaded application code.
  • This implies that a modification performed in the list file after downloading is not taken into account by the application.

• This function is used to create an Identifier (ID) or ListID for a list of application variables that are typically stored on the development PC.
• The list of application variables:
  • Is a simple .TXT file.
  • Can contain only one variable name per line.
  • Can be only global variables (i.e., Internal variables known by all programs.)
• This function's ID output can be used as an input to LogFileCSV.
  • It defines the application variables whose present value is recorded each time LogFileCSV is executed.

Inputs

Input	Data Type See Data Types.	Range	Unit	Default	Description
FILE	STRING	1 to 255	N/A	No default	Pathname of the list file (.TXT). Must be a constant value.

Outputs

Output	Data Type See Data Types.	Range	Unit	Description
ID	DINT	No range	N/A	ID of the list. To be passed to other blocks.

File Setup

Before using VLID, create a file with a list of desired application variables.

The list of application variables:

• Is a simple .TXT file.
• Can contain only one variable name per line.
• Can be only global variables (i.e., Internal variables known by all programs.)

Procedure

1. Create a text document file (.txt) on your file system.
2. Edit the file to enter application global variables line by line.
   • The compile step fails if there are any variables in the file are unrecognizable
     (e.g., misspellings, unnecessary characters, invalid variables, etc.)
   • Example of file:

   My_variables.txt

   TravelSpeed

   MasterAbsPos

   MasterDeltaPos

   Axis1Status

3. Save the file.
4. The full path to this file is used as the input for this function.
   • Example: C:\Users\Public\Documents\My_variables.txt.

FBD Language Example

FFLD Language Example

The function is executed only if EN is TRUE.

IL Language Example

Not available.

ST Language Example

ID := VLID ('C:\Users\Public\Documents\MyFile.txt');