Option 3.4.4. Points Control Limits

In order to use Points to set control limit criteria, use the Points option in the Limits tab of the Properties dialog box. Also, you can use the Force Auto Recalc feature to set the Point values for control limits.

Specify points for control limits.

Use auto recalculation to set point values.

Specify Points for control limits

  1. Select the Limits tab.

  2. Check the Points radio button.

  3. Enter the a different Point for the XBar UCL, CL and LCL control limits as follows:

Click to browse for an existing Point in the Select a Point dialog box, or

Click to designate a New Point.

  1. Enter the a different Point for the R/S UCL, CL and LCL range or standard deviation as follows:

Click to browse for an existing Point in the Select a Point dialog box, or

Click to designate a New Point.

  1. Indicate the floating-point array Point of six (6) elements in the Setpoint ID field if you want to use the current control limits elsewhere in your project, or download them to a device.

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.

  1. 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 Point 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.

Point On/Off

Set to

Auto-calculation is

Point On

TRUE

Activated and the XBar-R/S control limits are recalculated. The data collector will set the control Points (specified in the dialog box fields) to the calculated values.

Point Off

FALSE

Deactivated and the last calculated values are used until the control Points are updated. 

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.

More information

Step 3.4. Set limits for variable quality characteristics.