Assigning Block Calculation Properties
The memory board assembly consists of the memory board controller and two memory boards. For the purposes of this example, assume that the memory boards are operating in a redundant configuration so that you can learn how to model redundancy in Windchill RBD.
1. Double-click the left block to open the Calculation Properties window.
2. On the General page, for Assembly, enter MEM061789.
3. For Part Number, enter DRAM512-31.
4. In the left pane, select the Failure page.
5. For Failure Distribution, click the browse button 
to open the Distribution window.
to open the Distribution window.6. Leave Distribution set to Exponential.
7. Leave Failure rate selected. Then, to the right, enter 0.396516 for the failure rate.
8. Click OK to close the Distribution window. The Calculation Properties window now displays the specified exponential failure rate for Failure Distribution.
9. For the remaining parameters, use the default values.
10. In the left pane, select the Redundancy page.
11. For Quantity, enter 2.
12. For Redundancy Type, select Parallel Operating.
13. Leave Quantity Required set to 1 and Switch Probability of Success set to 1.000000.
14. Click OK. In the block diagram, the first block shows the redundancy. You might need to drag the right-most block further to the right to adjust the space between the blocks.