Variables

All variables in the entire project are grouped by:

Variable	Description
Global Variables	List all global variables used and accessible throughout the entire program.
Program Variables	List the variables related to your specific selected program.
Retain Variables	List all variables to be retained when the system is powered down.

For each variable, the Dictionary toolbox allows you to set these parameters:

Field	Description
Attributes	The variable attributes are Read-only, External, IN, OUT. Read-only: A variable set as Read Only is a constant. It cannot be modified in the PLC code, but it can be manually forced. See Force a Variable for more information. Read-onlyvariables can be mapped to Inputs but not to Outputs. Inputs can change state and a Read-only variable cannot change its value to match the input state. External: this attribute is not used. IN or OUT: Input or Output parameters of User Defined Function Blocks
Description	The variable description is a long comment text that describes the variable.
Dim.	To declare an array, specify dimensions for an internal variable. See Arrays for more information.
HMI	Select variables to be used in HMI. See Map Variables to HMI for more information.
Init value	The variable initial value when you start your application. See Variable Initial Value for more information.
Name	The variable name.
Syb.	Reserved.
Tag	The variable tag is a short comment, that can be displayed together with the variable name in graphical editors. Click for examples Edit the variable parameters. Add the variable to your FBD program. Resize the rectangle to make the Tag and Description visible.
Type	The variable type (can also be UDFB or complex structure). See Data Types for more information.
User Group	The variable user group (used for sorting variables).
Value	All the variables in the Dictionary are animated with real-time values 1 This column is only displayed when your application is running. See Variable Monitoring for more information.