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Background documentationi5SPCChart Locate this document in the navigation structure

 

A new display template in SAP Manufacturing Integration and Intelligence (SAP MII) based on SAP UI5.

SPC Charts are used to monitor stability of a process. The main features of a control chart are:

  • Data points

  • Centerline (average or mean value)

  • Upper and Lower Control Limits (indicates whether the process is in control or out of control)

A control chart always has a centerl line for the average, an upper line for the upper control limit and a lower line for the lower control limit. The centerline, upper, and lower lines are determined from historical data. A process is classified as in control or out of control by comparing the current data to the centerline, upper and lower lines. The boundaries are set by calculating the mean, standard deviation, and a set of data collected when the process is in control. The subsequent data is compared to already calculated mean, standard deviation and range to determine whether the new data falls within the boundaries. If the data plotted is within control limits, the process is stable. If the data is plotted outside the control limits, the process is instable and must be fixed before defects occur.

For more details, see iSPCChart.

Example

The figure below explains the different areas of an i5SPCChart:

This graphic is explained in the accompanying text.