PLC Variable Selector

Create PLC Variable Button

This button allows is used to create a new variable to be mapped to the selected items.

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 Variable Initial Value.

Based on the variable Type we select, the KAS-IDE automatically sets the Dimension (the size of the array) and assign the bits across the objects.

In this video we will learn how to map a variable to several PDO objects.

- Safety PDOs are highlighted in yellow with a border.
- Any variable assigned to a FSoE PDO must be Read Only.
  See About Safety, PDOs, and Variables.
- See Set Up a Variable to Monitor Safety Data for step-by-step instructions.

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.