Executing ELS Sequencing—Exercises

Main Exercise

Purpose: The purpose of this lesson is to show how to sequence and define dependencies for Execution Logic Orders (ELOs) and operations in an Execution Logic Structure (ELS) connected to a maintenance order. An ELS is generated when a maintenance order with the Execution Logic Structure distribution type is set to the Under Preparation status. When dependencies have been added and sequencing has been done in the ELS, you will run the Plan/Calculate Critical Path option to calculate planned dates for the included operations and ELOs.

In this lesson you will learn how to:
Move operations between ELOs
Define dependencies between the operations of an ELO
Define dependencies between ELOs in the ELS
Calculate and view the critical path

Once you have finished updating the ELS on the maintenance order (e.g., sequencing, defining dependencies and calculating the planned dates) you can continue with the work flow for processing maintenance orders. For instance, you can start with the Releasing the Maintenance Order exercise.

Prerequisites: In order to perform the exercises in this lesson, the Generating Execution Logic Structure exercise must have been completed.

Windows:
Maintenance Order/Exec. Logic/Gantt

Move Operations between ELOs

  1. Open the Maintenance Order window and query (F3) for the necessary maintenance order.
  2. Click the Exec. Logic tab and select the maintenance order node (top node) in the graphical object structure to ensure that all levels of the ELS is displayed in the Gantt.
  3. Click the Gantt sub tab.
  4. To display the operations in the Gantt, right-click on the chart and then click Show Operations.
  5. In the chart, the operation can be moved by using the Move Operation dialog box.
  6. To open this dialog box, select the activity bar for the operation, right-click, and then click Move Operation.
  7. In the editable ELO Number field, use the List of Values to select the ELO to which the operation is to be moved.
  8. Click OK.

Note: The Move Operation dialog box can also be opened from the graphical object structure by right-clicking on the operation node. In the graphical structure, you can also drag and drop the operations between the ELOs.

Define Dependencies between the Operations of an ELO

  1. Make sure that you are in the Maintenance Order/Exec. Logic tab, and that your maintenance order is retrieved.
  2. If not already selected, in the graphical object structure select the maintenance order node (top node) to ensure that all levels of the ELS is displayed in the Gantt.
  3. Click the Gantt tab.
  4. Right-click on the chart and then click Create Dependencies Mode.
  5. Draw dependencies between the operations of the selected ELO. Note that any dependencies defined in the ELS template the ELS is based on, is created in the ELS when generated for the maintenance order.
  6. The changes are saved automatically.

Define Dependencies between ELOs in the ELS

  1. Make sure that you are in the Maintenance Order/Exec. Logic tab, and that your maintenance order is retrieved.
  2. If not already selected, in the graphical object structure select the maintenance order node (top node) to ensure that all levels of the ELS is displayed in the Gantt.
  3. Click the Gantt tab.
  4. Right-click on the chart and then click Create Dependencies Mode.
  5. Draw dependencies between the ELOs.
  6. The changes are saved automatically.

Note: Dependencies cannot be defined between the grouping nodes.

Calculate and View the Critical Path

  1. Make sure that you are in the Maintenance Order/Exec. Logic tab, and that your maintenance order is retrieved.
  2. If not already selected, in the graphical object structure select the maintenance order node (top node) to ensure that all levels of the ELS is displayed in the Gantt.
  3. Click the Gantt tab.
  4. Ensure that dependencies have been added and sequencing has been done for desired operations and ELOs in the ELS.
  5. Right-click on the chart and then click Plan/Calculate Critical Path.
  6. If the planned dates on the ELOs are calculated to be outside the required date interval on the maintenance order, the Change Required Dates on the Maintenance Order dialog box opens.
  7. Change the required dates on the maintenance order so the calculated planned date interval for the ELS will fit within the required date interval on the maintenance order.
  8. Click OK.
  9. In the Gantt, verify that the ELOs and operations have been placed correctly in time and order. Hint: Place the cursor at the activity bar for a grouping node, ELO or operation and the tool tip will show you the calculated planned dates.

Note: The calculated planned dates for the grouping nodes, ELOs and operations can also be viewed in all the sub tabs belonging to the Maintenance Order/Exec. Logic Structure tab.