1. Using Production Scheduling
  2. Analysis and Adjustment Using the Gantt Chart

Analysis and Adjustment Using the Gantt Chart

Review schedule analytics and use the Gantt Chart to review detailed aspects of your schedule using various filtering and highlighting features, and to perform manual schedule adjustments.

Analyze

Before working with the Gantt Chart, review these analytics:

  • Late Work Orders: Number of work orders and planned orders scheduled for completion after their need-by dates.
  • Late Demands: Number of demands with available date after requested date.
  • Changeover Time: Sum of all changeover time durations.
  • Labor Utilization: Percentage of labor resource usage
  • Equipment Utilization: Percentage of equipment resource usage.

Understanding the Gantt chart

  • On work center resources that are setup with default units greater than one, the work order operations can’t be seen individually on the Gantt chart. In such cases, the resource usage is indicated through different colors. The darker shades of the color are used to denote heavier usage of resources.
  • Darker shade of color is used for operations belonging to planned orders from Oracle Supply Planning, while lighter shade is used for operations belonging to work orders from SCM Execution.
  • The first solid vertical line represents the start of the schedule horizon; the second solid vertical line represents the end of the schedule horizon.
  • The first dashed vertical line represents the end of the fixed time fence; the second dashed vertical line represents the end of the resource constraint horizon.
  • Gray areas in the background of a schedule indicate downtime for that specific resource.
  • To view the resource usage levels of a particular resource, and individual work order operations that are scheduled on that resource, select the option Display of Resource Units in Gantt Chart on the Resource Parameters page. If you don’t select this option, then you can only view the aggregate resource usage levels.
  • To collapse or expand the Gantt chart and view the data in a tabular form, click the small solid line at the bottom of the page.

Use the various options available on the Gantt chart toolbar to help you analyse and understand your schedule..

  • Resource Group: Use this filter to choose whether to review data for all resources or for a group of resources for schedule analysis.
    Note: When the Default Units Available value for a work center resource is more than 1, you can review resource levels using colors in the Gantt chart. Individual operations aren't displayed.
  • Filter By and Filter Value: Use these fields to identify specific work orders or work orders that produce specific items. More information is displayed when you hover over an operation in the Gantt chart.
    Note: The Filter By values, Asset and Type, apply to Maintenance work orders only.
  • Highlight Attribute: Use this option to select a specific attribute to highlight all work orders or items defined with that attribute. For example, if you select attribute as Pack Size, then all operations with the Pack Size attribute will be highlighted, and those with the same pack size value will be displayed in the same color that was assigned to that size.
  • Highlight: Use this option to highlight work orders and work order operations based on:
    • Firm
    • Fixed start time
    • Late
    • Offload to alternate source
    • Offloading allowed
    • Pegged to shortage
    • Released
  • Show Supplies: Use this option to identify the supplies and view the upstream and downstream pegging links. A Supplies row in the Gantt chart displays the purchase orders and inbound transfer orders.
  • Show Demands: Use this option to identify the demands and view the upstream and downstream pegging links. A Demands row in the Gantt chart displays the sales orders and outbound transfer orders.
    Note: Only the earliest 200 supplies and earliest 200 demands are displayed in the Gantt chart.
  • Pegging link button: Use this option to identify task dependencies. Task dependencies are represented by solid and dashed lines known as pegging links. Straight vertical lines indicate highly synchronized production, and diagonal lines indicate less synchronized production. Select a work order operation, or a diamond in the supplies or demands rows to view the pegging links.

    Solid lines indicate successive operations within the same work order routing. Dashed lines indicate inventory relationships between supplies and operations, operations belonging to different work orders, operations and demands, or supplies and demands.

    Dashed lines indicate these scenarios:
    • A producing work order feeding one or more downstream consuming work orders or demands.
    • A consuming work order receiving components from one or more upstream work orders or supplies.
    • A supply feeding one or more demands.
    • A demand receiving components from multiple supplies.
    Note: The pegging links are visible only when the Show Pegging Links button is selected.

    Pegging is calculated at the end of each solve action. You can use the production scheduling pegging REST services to access the pegging data, which is the basis for pegging visualization in the Gantt chart. See REST documentation for more details.

    Pegging links are only visible for objects that are currently displayed on the Gantt chart based on the selected resource group. You need to expand these resource groups to view all the pegging links. For resources with default units available greater than one, pegging links are displayed only if the resource is displayed by resource units, defined through resource parameters.

  • Panning mode: Use this option to enable smooth exploration of the content, making it easier to focus on different areas while maintaining context.
  • Edit Resource Availability: Use this option to add or remove downtime, add availability, or modify resource availability. In Edit Resource Availability mode, resources that are defined with default units available greater than one in Work Execution are displayed using a color scheme. The scheme uses ten colors ranging from green to red, where green indicates more units available and red indicates fewer units available.
  • Clear Pegging Highlights
  • Zoom to Fit: Use this option to resize the page.
  • Edit: Use this option to modify work order operation.

Adjust

You can change resource assignments, manage downtime events, and operation properties in the Gantt Chart.

Change the resource or start time for an operation.

  1. 1. Move an operation from a resource to an alternate resource by dragging and dropping it or move it backward or forward in time on the same resource. You can also select a sequence of operations to drag and drop.

    • For resource offloading to work within Production Scheduling, the resource sequence number of the work order operation must match the resource sequence number of the work definition operation in the Supply Chain Execution work area.
    • If you can't offload an operation to an alternate resource, then verify the presence of alternate resources in the respective work definition operation-resource sequence in Supply Chain Execution, Work Definition, and that the work order isn'tfirm.
    • Phantom components with resource alternates in their work definition might not be offloaded by the system. This might be because the phantom explosion process in Work Execution during work order creation can introduce inconsistencies in resource sequence numbers.
    • Alternate resources and operation attributes exist on the work definition but not on the work order within the SCM Execution. To ensure they're included in a production schedule, the work definition should be setup such that the phantom items are consumed by a separate (upstream) operation-resource sequence with Scheduled option set to No.

  2. Specify the operation start time and click Save. If you selected multiple operations, specify the new start time of the first operation in the sequence.

  3. Click Repair to ensure that the schedule accommodates the adjustment. Here are some things to consider when you do a repair after a drag and drop operation:
    • Dropped operations are scheduled one after the other without any time gap.
    • For constrained resources with default units available set to one, any overlaps among the moved operations will be resolved and changeovers will be inserted as per the defined changeover rules.
    • The target resource, and not the original resource, are rescheduled only when the operations are offloaded.

Manage downtime events and availability.

You can add or remove downtime or add availability in Edit Resource Availability mode. After making the changes, click the button again to deactivate the edit mode

To add a downtime event:

  1. Right-click the schedule.
  2. Select Add Downtime.
  3. Enter the resource or resource group, start date, start time, end date and end time.

  4. To modify downtime over a specific period of the schedule horizon, select Recurrence . You can define recurrence only if the events have duration of up to 24 hours.

    1. Enter the Start On date and the End By date. The period should be within the schedule horizon.
    2. Select the weekdays for which the downtime must be applied.
  5. Click OK
To remove a downtime event:
  1. Right click the schedule.
  2. Select Remove Downtime.
To add availability:
  1. Right click the schedule.

  2. Select Add Availability.

  3. Enter the resource or resource group, start date, start time, end date and end time.

  4. To modify downtime over a specific period of the schedule horizon, select Recurrence. You can define recurrence only if the events have duration of up to 24 hours.

    1. Enter the Start On date and the End By date. The period must be within the schedule horizon.
    2. Select the weekdays for which the availability must be added.
  5. Select OK
  6. Click Solve to ensure that the schedule accommodates the new resource availability and new downtime.

To edit resource units:

  1. Right click the schedule.
  2. Select Edit Resource Units.
  3. Enter the resource, start date, start time, end date, end time, and resource units.

  4. To modify downtime over a specific period of the schedule horizon, select Recurrence. You can define recurrence only if the events have duration of up to 24 hours.

    1. Enter the Start On date and the End By date. The period must be within the schedule horizon.
    2. Select the weekdays for which the availability must be added.
  5. Select OK
  6. Click Solve to ensure that the schedule accommodates the new resource availability and new downtime.
Note:

The solve process discards manual adjustments to work order operations, including those saved using the Repair action, and calculates a new schedule

Note:

To ensure predictable repair solve results, avoid performing both drag and drop actions in the Gantt chart and resequencing actions in the Dispatch List involving the same work order operations. Repair the schedule after Dispatch List resequencing and also after Gantt chart drag actions.

Change operation properties that impact the solve behavior.

  1. Select one or more operations on the Gantt chart.
  2. Click the Edit button on the toolbar to open the task drawer.
  3. In the task drawer, specify the desired values for the attributes Fixed Start Time and Offloading Allowed as desired.
  4. Select Update.
  5. Click Solve to implement the operation attribute changes. Only after this solve action will subsequent repair actions consider these operation attribute changes.
Note: The values for offloading allowed and fixed start time aren't released to Cloud Manufacturing nor are they persisted across scheduling cycles.