VLID

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

Inputs

Input	Data Type	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	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.

Remarks

• 
  

• 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.

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');