Windchill Risk and Reliability Desktop Help > Windchill RBD > RBD Interface > Block Diagram How-Tos > Specifying an Interval for a Maintenance Task
Specifying an Interval for a Maintenance Task
As described in Maintenance Interval Optimizations, the high cost associated with performing maintenance requires that it be performed judiciously. You can specify the interval at which to perform a maintenance task. This is in contrast to calculating the optimal interval for performing the task, which is described in Calculating an Optimal Interval for a Maintenance Task.
1. In the RBD Diagram pane, double-click the block to open its Calculation Properties window. For more information, see Block Calculation Properties.
2. On the Maintenance page for the block, do the following:
a. In the Maintenance table at the top of the page, select the task for which to specify the interval.
For task insertion information, see Inserting Maintenance Tasks for a Block.
b. Beneath the table, click Edit Task. The task’s Maintenance Properties window opens. For more information, see Maintenance Properties.
3. On the Schedule page for the task, do the following:
a. If the block is part of a phase diagram and the task can be performed during maintenance only phases, select Perform during maintenance only phases. This checkbox pertains only to phase diagrams.
b. Select Schedule maintenance. Among the properties made available are Maintenance interval and Units.
c. For Maintenance interval, enter the number of days between maintenances.
d. For Units, indicate whether the number of days specified is expressed in terms of operating days or calendar days.
e. Under Optimize, for Optimization type, ensure that None is selected.
If any other choice is selected, the value entered for Maintenance interval is ignored and an optimal interval is calculated.
4. To specify an interval for another task for this block, do the following:
a. Use the navigation control at the top of the Maintenance Properties window to select the task.
For information about using this control, see Changing the Active Object in the Properties Window.
b. If a window opens for indicating whether you want to save changes, click Yes.
c. For the newly selected task, repeat step 3.
5. Repeat step 4 for each task for which to specify an interval.
6. When finished, click OK to close the task’s Maintenance Properties window.
7. Click OK to close the block’s Calculation Properties window.
The next time you run RBD calculations, the intervals you have specified are used when calculating the achieved availability for the system. For more information, see Calculating RBD Results.