MTBF & MTBR & MTTF

[DORRA]

Hi Guys,

Could someone please guide me on how to generate a report in SAP PM that includes the KPIs: MTBF, MTTF, MTTR, and MTBR? When using transactions MCI7, MCJB, or MCJC, I can only find MTTR and MTBR.

I'm working with SAP S/4HANA and would appreciate any help on how to extract the missing KPIs (MTBF and MTTF).

Thank you in advance!

[Prasath]

Hello Dora, The mean time between failures is the expected average time period between the last failure and the next upcoming failure. It is a measure of how reliable a system is. The KPI for this mean time is calculated as follows:

Mean Time Between Failures = (The total time period between two subsequent failures during the time range) / (the number of failures during the time range)

The total time period between two subsequent failures during the time range is time period between the malfunction start date of a previous notification with a breakdown and the malfunction start date of the next notification with a breakdown. The number of failures during the time range is the total number of collected notifications that have a breakdown and for which the time period between two subsequent failures is known.

Example

You have selected 1 month as a time range for your failure mode analysis. Within this period, 2 notifications with a breakdown were collected. For the first notification, the time period between the subsequent failures is known. For the second notification, the time period between the subsequent failures is not known as the next failure has not yet started:

• The first notification with a breakdown has a malfunction start date at 8:00 a.m. January 1, 2019 and a malfunction end date at 1:00 p.m. January 1, 2019.
• The second notification with a breakdown has a malfunction start date at 5:00 p.m. January 1, 2019 a malfunction end date at 2:00 a.m. January 2, 2019.

This means that the total time period between subsequent failures is 9 hours and the number of failures for which the time period between the subsequent failures is known is 1. The resulting mean time between failures is 9 hours (9/1).

Example

You have selected 2 months as a time range for your failure mode analysis. Within this period, 3 notifications with a breakdown were collected. For 2 of these notifications, the time period between the subsequent failures is known. For the third notification, the time period between the subsequent failures is not known as the next failure has not yet started:

• The first notification with a breakdown has a malfunction start date at 8:00 a.m. January 1, 2019 and a malfunction end date at 1:00 p.m. January 1, 2019.
• The second notification with a breakdown has a malfunction start date at 5:00 p.m. January 1, 2019 a malfunction end date at 2:00 a.m. January 2, 2019.
• The third notification with a breakdown has as malfunction start date at 10:00 a.m. January 2, 2019 and a malfunction end date at 2:00 p.m. January 2, 2019.

This means that the total time period between subsequent failures is 26 hours (9+17) and the number of failures for which the time period between the subsequent failures is known is 2. The resulting mean time between failures is 13 hours (26/2).

Regards

Prasath

[DORRA]

Thank you, Prasath.

I tried to create the scenario, but the problem is that, as you can see in the screenshot, the MTBF KPI is not calculated and is not displayed. Is there another Fiori application on-premise or a transaction for backend reporting that calculates this MTBF KPI?