To distinguish input and output connector tabs on blocks, you can assign labels to them. The labels are displayed on the connector tabs when the View > Connector Labels command is activated.
When you apply labels to compound block connector tabs, and then drill into the compound block, those labels appear next to the input and output connectors on the left and right side of the screen.
If you do not specify a connector label, the label defaults to the class name specified in the Connector Properties dialog box, if one is specified.
To assign connector labels
1. Hover over the connector tab on the compound block to be labeled and double-click.
2. In the Connector box, enter a name.
3. Click OK, or press ENTER.
4. If you want the label to appear on the block, activate the View > Connector Labels command.