A tag is made of a name and value. When creating a part, names are automatically assigned to tags. Usually, it's a good practice to rename tags with short and descriptive names since they will be used when mapping actuators and sensors to an external controller.
Tags can be of three different data types depending on sensors and actuators type and configuration:
Bool for on/off values;
Float for real numbers;
Int for integer numbers.
Note that each driver may need to convert a tag to a different data type, which can result in loss of information. For instance, the Modbus TCP/IP Client driver converts Int and Float data types to a 2 byte integer.
You can show or hide Sensors Tags and Actuators Tags by clicking on the respective icons on the toolbar.
Tags can be docked to the top left corner of the window by Left-clicking on them. Docked tags are always visible, independently of the camera position and rotation. Also, once tags are docked, you may rename, force and injected failures on them. To clear all docked tags, click on View > Clear Docked Tags.
Rename a tag by selecting it and Left-click on the name field.
Sensors and actuators tags can be forced by Left-clicking on the tag's button, slider or input field (depending on the type of data held by the tag). When forcing an actuator's tag, it will override the value read from the controller. By forcing actuators, you can play the role of the controller and control a scene manually. Forcing sensor's tags overrides the sensor's values. Even if a sensor is not detecting an item, forcing its value will make it to be sent to the controller.