From the KPI list page, click on the menu option ‘Configuration’ for Meantime Between Failure. You will then be taken to the configuration page. Here you need to select an appropriate sensor to provide input data for the formula:
MTBF = Uptime / Number of repairs
Once this is done, you have enough to click save, upon which your KPI will become active. For information on how to set up targets, read the article How to use targets.
The specifications for the required sensor are as follows:
Status (availability): This sensor needs to be supplying data on the current status of your machine. Is it actively running or not? The virtual or physical sensor need to provide the following values: "0" for "OFF", "1" when the machine is operating normally, "2" if the machine is in failure.