PLC Variable Selector

Create PLC Variable Button

This button allows the creation of a new variable to be mapped to the selected item(s).

Field	Description
Scope	Defines where the variable is created
Name	See Name a variable
Type	Defines the Type of the variable, and its Dimension if the variable is an array
Dimension	The dimension of the variable (read-only). The dimension is set automatically based on the necessary size and the selected variable type.
Init Value	See Initial Value of a Variable

Advanced Button

For integer variables with types stored on several bits, the Advanced button gives access to the Start bit definition. This allows you to link a set of channels to a specific range of bits within an integer variable.

For example, when you select three channels ranging from 1 to 3 and map them to a DINT variable (stored on 32 bits ranging from 0 to 31), the first channel can be linked to position ranging from 0 to 29.

The three channels are mapped to the last three bits ranging from 29 to 31.

When the selected variable is an array, the “Start bit” is disabled. An offset is not allowed when mapping to an array.