Predecessor Data
The Predecessor pane is shown only when the 217Plus or PRISM model is selected for the assembly. For predecessor analysis, you supply data in two different System files, which must both be in the same Project. In the System file with the predecessor assembly, you complete the last two fields and run prediction calculations. In the System file with the new assembly, you use the browse button for the first field to open a window in which to make file, configuration, and assembly selections for the predecessor assembly. Based on your selections, failure data for the predecessor assembly in shown in the three display-only fields.
Predecessor Pane
The following table describes the data fields that appear in the Predecessor pane for an assembly.
Field
Description
Predecessor information
Provides for making System file, configuration, and assembly selections that identify the predecessor assembly. When you click this field’s browse button, a window opens for making the necessary selections. For more information, see Predecessor Assembly Selection Window.
* 
Once you select the predecessor assembly, the next three fields, which are display-only, show the values calculated or entered in the System file with the predecessor assembly.
Predecessor failure rate
The predicted failure rate for the predecessor assembly.
Predecessor number of hours
The number of hours that the predecessor assembly operated in the field.
Predecessor number of failures
The number of failures observed for the predecessor assembly during the operating time specified above.
* 
As noted earlier, the two fields below are completed in the System file with the predecessor assembly. After entering values, you run prediction calculations.
Number of hours
The number of hours that the predecessor assembly operated in the field.
Number of failures
The number of failures observed for the predecessor assembly during the operating time specified above.