High-level Work Flow
This section provides a high-level overview of the Mean Time Between Failures (MTBF) calculation process. It helps you to understand the available configuration options and how they help to qualify the records for the calculation of the metric.
The object mapping decides from which record fields you need to collect the value for the calculation. You can use the SFM expressions to qualify/filter the Installed Products and Work Orders (belonging to the Installed Product). The SPM engine picks up only the qualified records and executes the MTBF calculation process.
This metric is calculated based on the attributes of the Installed Base (Installed Product) object.
1. The system filters the records (of the Work Orders for a given Installed Base) based on the following conditions:
a. Records that were created/modified within ‘n’ days prior to the SPM engine execution date for computing the metric, where ‘n’ is the value of the SET0010 setting. The default value of SET0010 is 365 days. You can update/edit the value of SET0010 as required.
b. The Last Modified Date of the record (of the Work Orders for a given Installed Base) is greater than the last execution time of the SPM Engine. The system depends on the modified date field for picking up records, it means that the Work Orders that get modified after the last run will be picked up. The system picks up only the records which satisfy these criteria.
c. If the reprocessing criteria are configured then the Work Orders that are modified after the last run and satisfy these criteria will be picked up by the system.
2. Use the Settings >Object mapping section to define the object mapping for this metric. Choose whether you want to consider the Down Time as the difference in time between the configured Created On and Fixed On Dates Work Order fields, or Down Time if downtime should be taken from the Downtime records associated with the work order. You need to select the source for Account, Installed Product, Business Hours, and any other additional data fields required for metric calculation.
3. Select the expression to qualify the Installed Product for metrics calculation. Using the expression to qualify the Installed Products, users can set the criteria to filter the Installed Products that are considered for metric calculation.
4. Select the expression to qualify Work Orders for this metric. The qualifying Work Orders which meet the criteria are only qualified for calculation.
5. Select an expression to qualify the modified Work Orders for reprocessing. These criteria will avoid re-processing the Work Orders that are modified after being considered in metric calculation once.
The SPM engine picks up the qualified records for metric calculation. It executes the metric calculation process based on the criteria and schedule. One MTBF record is created per each installed product. The SPM Mean Time Between Failures object lists the available Mean Time Between Failure records. You can click and view the details of each record. It lists the MTBF value as recorded. The system calculates the Actual Up Time by finding the difference between the Expected Up Time and Down Time. The Mean Time Between Failures per month is calculated using the following formula: Actual Up Time ÷ Number of Work Orders. The organization's business hours are taken into account for doing the calculations.
You can use the Reports and Dashboards to visualize the percentage of Mean Time Between Failures based on various categories.