# Creating Variables

You can learn how to create variables.

- 1.About Variables
- 2.Creating Variables

Variables are named spaces in the memory that store data values. You can think of a variable as a container for a value.

Create all the variables you need, and then associate variables with tanks, switches, lamps, data displays, and other objects on the screen.

To communicate with external devices connected to the display unit, create a variable and assign a device address value to it.

### Internal Variables and External Variables

Internal variables are variables that are not associated with device and are used only for internal display unit operations.

External variables are variables associated with a device address value.

Note:

- For details about variables, please refer to the following topic.
  About Variables
- For information about supported devices, refer to the following.
  Device/PLC Connection Manual