I/O Item Overview
When you add a device to the project tree, LabVIEW populates the device with the default I/O items for the device type. You can create custom data items by clicking Add New Item, then using the Add Logical Item dialog box to configure the item. Some I/O items represent things other than input and output channels, such as a power supply or cold-junction compensation channel.
You can use the Item Properties page to configure individual I/O items.