That device is a user-configured one. Tags can be added manually or imported from a development system (Step7 or Tia Portal).
By default, the device includes the tag Failure in the group Diagnosis and 2 tags in the group ReservedChannel.
The Failure tag cannot be deleted, it jumps to True if communication with the device fails.
2 tags in the group ReservedChannel are destined for operation with reserve channels.