Author: Dave Sand
Keywords: JMRI logixng tables csv table

# JMRI: LogixNG Global Variables Table

The LogixNG Global Variables table contains a list of the defined global variables. See LogixNG Reference - Chapter 12 for details.

- Table Content
- Select Actions
- Menu Items
- Add a LogixNG Global Variable

## Table Content

The LogixNG Global Variable table lists all of the currently defined LogixNG global variables. Each row has a standard set of columns.

System Name
  The system name for the LogixNG Global Variable. LogixNG table system names have an IQGV prefix normally followed by numbers. For details about the LogixNG Global Variable system name, see Add a LogixNG Global Variable. The system name cannot be changed.
User Name
  The user name for the LogixNG Table. A user name is required and it will be used when referring to the global variable. The name must begin with a letter and can contain letters, digits, and underscore. It cannot have spaces or other special characters.
Comment
  A free form comment field for the LogixNG
Menu
  The Select combo box is used to select actions for the selected LogixNG. See Select Actions
Type
  Global Variables use the same types as Local Variables. The default type is None.
Initial Value
  This will be the initial value for the global variable. If no value is supplied, the default value will be null. The initial value is applied during data file loading. A new global variable will be assigned a null value.
Set to initial value
  Changes to the variable type or initial value do not take effect until the data file has been stored and subsequently loaded in a new PanelPro session. The Set to initial value button is used to apply the change immediately.

## Select Actions

The dropdown combo box has 2 actions that can be applied to the current LogixNG global variable row.

Browse
  The Browse option opens a text window with a representation of the global variable. The browse report includes the system and user name, the variable type and current contents of the variable. See LogixNG Browser for details about the browser.
Delete
  The Delete action deletes the current LogixNG global variable. A confirmation dialog will be displayed.

## Menu Items

Tools
  The tools menu has two items: Open clipboard and Open PickList Tables. See LogixNG Reference - Chapter 2 for details on the using the clipboard. The PickList was designed for dragging names, such as sensor names, to a text field. Most LogixNG name fields use drop down combo boxes, but this could be used when building Formulas.

## Add a LogixNG Global Variable

To create a new LogixNG Global Variable, click on the Add... button. The Add LogixNG Global Variable window will be displayed.

The system name is required. The system name for a LogixNG Global Variable always begins with the letters IQGV. If the entered name does not start with IQGV , it will be automatically added. The typical suffix is a number. If Automatically generate System Name is checked, the system name format will be IQGV:AUTO:nnnn. Any other format requires adding a $ (dollar) character between IQGV and the suffix.

The user name is required. The name must begin with a letter and can contain letters, digits, and underscore. It cannot have spaces or other special characters.

After clicking Create, the LogixNG Global Variable will be created. It will have the None variable type and the initial value will be null.