These are read-only. Refer to Settings to learn more.
Read-only (analog or digital input). For instance, input from a sensor. The variable follows the input.
These are write-only (digital output). For example, to switch a LED or relay on and off. The LED will follow changes in the value of the variable.
These can be read and written to, and are available to every block.
Or: Expression variables. These allow you to use an expression, for instance a conversion. An example:
sensorvalue * 10