It is used as the Input Display for the Keypad.
14.11.6.1 Input Display - Basic
For details on how to perform these settings, refer to the following. 15.5 Customizing the System Keypad of the Data Display
14.11.6.1 Input Display - Basic14.11.6.1 Input Display - Basic
15.5 Customizing the System Keypad of the Data Display