Perform Execution Logic Structure Sequencing

Explanation

This activity is used to sequence an execution logic structure (ELS). You can start sequencing and add or remove dependencies to the execution logic orders (ELOs) and operations of an ELS once it is generated. You can use the ELO Operation: Predecessors and Successors dialog box to add predecessor and successor relationships to an operation in the structure. It is also possible to move an operation from one ELO node to another or to move an ungrouped operation into an ELO node. This functionality is described in detail in the Move Operation within Execution Logic Structure activity.

Once you have finished sequencing the ELS, you need to run the Plan/Calculate Critical Path option to get the ELOs and operations placed correctly in time.

Prerequisites

• A maintenance order in the Under Preparation status must exist.
• An ELS must exist for the maintenance order.

System Effects

• The operations and ELOs connected to the maintenance order will be sequenced and dependencies defined.
• Predecessor and successor relationships between operations in the structure will be defined.
• The planned dates on the operations, ELOs (including grouping nodes) and the maintenance order will be updated automatically when sequenced.
• The sequencing will be transferred to the work order (in IFS/Work Order Management) when the corresponding maintenance order is released.

Window

Maintenance Order

Related Window Descriptions

Maintenance Order
Maintenance Order/Exec. Logic
Maintenance Order/Exec. Logic/Gantt
Maintenance Order/Exec. Logic/Exec. Logic Structure/Operations  

Procedure

1. Open the Maintenance Order window and search for the necessary maintenance order.
2. Click the Exec. Logic tab and then click the Gantt sub tab.
3. To view the entire ELS in the Gantt chart, select the topmost node in the graphical ELS structure.
4. To add or remove dependencies, you must first activate the Dependencies mode. To do this, right-click on the Gantt chart, and then click Create Dependencies Mode.
5. Draw dependencies between the operations or between the ELOs as needed.
6. To remove an existing dependency, right-click on the dependency arrow, and then click Delete Link.
7. To move an operation from one ELO to another or to move an ungrouped operation into an ELO follow the steps described in the Move Operation within the Execution Logic Structure activity.
8. Click the Exec. Logic Structure sub tab and then click the Operations sub tab to define predecessor and successors for an operation.
   1. Right-click on the record, and then click Predecessors and Successors. The ELO Operation: Predecessors and Successors dialog box opens.
   2. Select the Predecessor check box for the operation that is to be a predecessor to the selected operation.
   3. Select the Successor check box for the operation that is to be a successor to the selected operation.
   4. Click Apply.
   5. In the Operation ID field, select a different operation to work with if necessary.
   6. Define predecessors and successors for the operation.
   7. When you have finished defining predecessors and successors for an operation, click Save and Close.

Once you have finished sequencing the ELS, you need to run the Plan/Calculate Critical Path option to get the ELOs and operations placed correctly in time. Use the following steps for this:

9. Right-click on the Gantt chart, and then click Plan/Calculate Critical Path.
10. If the planned dates are outside the required date interval, the Change Required Dates on the Maintenance Order dialog box opens.
11. In the Requested Start field, enter the date and time the maintenance visit is required to start.
12. In the Requested Finish field, enter the date and time the maintenance visit is required to finish.
13. If you wish to reset the entire ELS back to how it was default generated, but based on the changed dates in the Requested Start and Requested Finish fields in this dialog box, select the Reset the Execution Logic Structure check box.
14. Click OK.