You can use your own criteria to set control limits using the Values option in the Limits tab of the Properties dialog box. Also, you can use the Force Auto Recalc feature to override limit values set in the dialog box.
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Specify values for control limits. |
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Use auto recalculation to set control limit values. |
Specify values for control limits
Select the Limits tab.
Click the Values radio button.
Enter the values for the XBar chart's control limits as follows:
XBar UCL—Upper control
limit.
XBar CL—Center line.
XBar LCL—Lower control
limit.
Enter the values for the R or S chart's range or standard deviation as follows:
R/S UCL—Upper control
limit.
R/S CL—Center line.
R/S LCL—Lower control
limit.
If you want to use the current control limits elsewhere in your project, or download them to a device, indicate the floating-point array Point of six (6) elements in the Setpoint ID field. The Point contains six elements for all values to be set in the following order: XBar LCL, XBar CL, XBar UCL, R/S LCL, R/S CL, R/S UCL. Do one of the following:
Click 
to browse for an existing Point
in the Select a Point dialog box, or
Click 
to designate a New Point.
Indicate the Specification limits for Histogram analysis as follows:
Lower – enter the Lower
Specification Limit (LSL).
Upper – enter the Upper
Specification Limit (USL).
Use auto recalculation to set control limit values
In the Force auto recalc field, indicate the Boolean Point ID that has been created to override the value control limits at runtime. This feature can be configured to be turned on or off at runtime.
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Point On/Off |
Set to |
Auto-calculation is |
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Point On |
TRUE |
Activated and the XBar-R/S control limits are recalculated. Pre-set values are ignored. |
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Point Off |
FALSE |
Deactivated and the last calculated values are used. Pre-set values are ignored until the data collector is restarted or dynamically refreshed. |
Do one of the following:
Click to browse for an existing Point
in the Select a Point dialog box, or
Click to designate a New Point.
Note: Whenever the Force Auto Recalc
Point is set to either TRUE or FALSE, the data collector will drop
the current sample and start fresh.
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Step 3.4. Set limits for variable quality characteristics. |
