About the Process Gantt Chart

The Process Gantt chart is opened by selecting the Process Gantt command, then selecting either the root system or a child system under the root system.

Multi-selection is not available. Only one system and its children are displayed in the Process Gantt.

If a child system is selected:

• The constraints between operations are taken into account even if they are not displayed in the Gantt scope.
• The product flow is taken into account even if it is outside what is displayed in the Gantt scope.

The columns of the Process Gantt chart display information about systems, operations, parts, fasteners, and resources. Any of the columns (except System-Operation) can be hidden/shown by right-clicking in the header area and clearing /selecting any of the column check box options.

The columns in this Gantt chart are as follows:

• System-Operation: Displays a tree view of the systems and operations.
• Duration: Difference between the start and end time.
• Begin Time: Start time of an operation.
• End Time: End time of an operation.
• Associated Parts: Instance names of the assigned parts of an operation. Parts may be displayed as a list with a separator (,).
• Type of Time: Estimated, simulated, or analyzed time of an operation.
• Utilization: Percentage of time for which a resource is used.
• Value Added: The value added is an optional attribute that can be defined in each operation of the system. This value is shown for each operation, and the average value of all operations is shown for the system. For more information, see Value Added Information.
• Number of Fasteners: Displays the number of assigned fasteners for operation and resources. The first number on the resource indicates the number of fasteners assigned directly to this resources behavior. The number in brackets is the sum of the fasteners assigned to the resources direct behavior and all fasteners assigned to all child behaviors.
• Number of Spots: Displays the number fastener spots. See Time Bar for Point Fastening Operations in the Gantt Chart
• Executing Resource: The working resource assigned to the operation.
• Localization Resource: The organizational resource assigned to the operation.
• Used Resource(s): The not working resources assigned to the operation.
• Resource used for positioning: The resource used for parts positioning for a given operation.

To hide/show any of the columns (except System-Operation), right-click in the column header area and deselect/select any of the column check box options.

To change the column size, place your cursor over the edge of the column. The cursor changes to arrow shape. Move the cursor left or right to change the column size.

To move a column, select the column. The cursor changes to hand shape. Move the selected column to left or right as required.

You can use the Customize Column(s) contextual command to customize the columns of the Gantt chart with operation, system, and resource attributes or any new customized attributes.

A set of contextual commands is available for expanding and collapsing the tree in the Gantt chart.

When you right-click any row of the Gantt chart, the following commands are available in the Tree Expansion contextual menu:

• Expand First Level: Displays the first level child row.
• Expand Second Level: Displays the first and second level child rows.
• Expand All Levels: Displays all the child levels of the selected row.
• Collapse All: Collapses the row and hides all its child rows.
• Expand Selection: Displays a Specification depth dialog box where you can specify a tree depth for the expansion. You can select one of the available depth levels (1 to 5) or all levels, or key in a positive number.

The cycle time of systems is displayed in the Process Gantt chart.

Cycle time is displayed by two vertical green bars. They appear if the system is a leaf system and has operations. The cycle bars stretch from the top of the system row to the bottom of its last operation row.

If the leaf system has a zero cycle time, only the first bar is displayed.

A Flow view and a System view are available in Process Gantt chart.

• Flow View: This view displays the flow between systems. It takes into account the full product flow and time constraints between operations. You can use this view to display the product flow according to the cycle time.
• System View: This view shifts every system instance at zero begin time. All systems are seen in parallel.

To switch from one view to the other, right-click the root object of the Gantt chart and select either Flow View or System View in the context menu.

The Flow View / System View is managed for all open Process Gantt charts.

An operation can be created under a system or under another operation in the Process Gantt chart.

This is done as follows:

• Select the command of the required operation type.
• Select a system in the Gantt chart or any of its operations (parent of the new operation).
• Enter its name in the pop-up that appears.

The new operation is then displayed under the system after the last operation (if a system was selected) or under the operation, if an operation was selected.

It is also possible to copy, paste, and delete operations in the Process Gantt chart. The Gantt chart is updated after the copy, paste, or delete.

Operations and systems can be reordered in the Process Gantt chart.

To reorder operations and systems, drag and drop a row (system or operation) on another one. The tree is also updated after the drag and drop.

Multi-Selection is not available. Only child nodes belonging to the same parent can be reordered in the Process Gantt chart.

Product flows and time constraints can be created in the Process Gantt chart by dragging and dropping systems/operations and using contextual commands.

The following drag and drop capabilities are possible in the Gantt chart:

• From a system to another system.
• From an operation to another operation.
• From a system to another operation.
• From an operation to another system.

In each case, a product flow is created.

If the drag and drop of a system or an operation to another system is done with the Ctrl key pressed, a context toolbar will appear with the following commands:

• Create Product Flow to create a product flow between the system or operation and the other system.
• Move to System to move the system or operation to the other system.

If the drag and drop of a system to an operation is done with the Ctrl key pressed, a context toolbar will appear with the following command:

• Create Product Flow to create a product flow between the system and the operation.

If the drag and drop of an operation to another operation is done with the Ctrl key pressed, a context toolbar will appear with the following commands:

• Create Product Flow to create a product flow between the two operations.
• Create Precedence Link to create a precedence constraint between the two operations.
• Create Start-Start Link to create a start -start synchronization link between the two operations. Both operations will start at the same time.
• Create End-End Link to create an end-end synchronization link between the two operations. Both operations will end at the same time.
• Create End-Start Link to create an end-start synchronization link between the two operations. You can specify a delay between the end of one operation and the start of the other.
• Move Operation to move the operation under another operation. The dragged operation becomes the child of the other operation.

For more information, see Creating Time Constraint Links Between Operations.

Note: You can access the Constraint Properties panel to edit time constraints and manage product flows by right-clicking the arrow, then by clicking Constraint Properties in the context menu.

In the Process Gantt chart, colors can be assigned to systems using the Color in Gantt View contextual command.

In the context menu, the following commands are available:

• Color by Resource: when activated, operations are colored according to their implementing resource in the Process Gantt chart.
• Default Colors: when activated, the default color is applied to operations.

To specify the scale units of the Process Gantt chart, right-click the title bar showing the time units and select Set Scale Units.

The dialog box that appears allows you to specify the time unit (seconds, minutes, and so on), the zoom, and the scale to be applied to the Gantt chart. A preview allows you to try out any entered values before accepting them.

In the Process Gantt chart, time can be edited if it concerns an operation (and not a system) which has no child and it is displayed in estimated time.

The estimated time is the only time that can be modified manually. Simulated and analyzed times are deduced, so they cannot be modified by defining a value.

To modify the estimated duration of an operation, do one of the following:

• Right-click the operation, select Properties then modify the estimated time value.
• Double-click the Duration column and modify the value in the pop-up that appears.
• Double-click the End Time column and modify the value in the pop-up that appears.
• Increase the length of the bar representing the operation.
• Double-click the bar representing the operation. A Properties dialog box appears to let you modify the duration as well as the name of the operation.
  Note: The operation must not have any children. An operation that has children is like a system: its duration is the sum of all the durations of its children.

  When an operation duration is 0, the operation is represented by a red symbol.

The value added is an optional attribute that can be specified on each operation of the system. This value is shown for each operation, and the average value of all operations is shown for the system.

Value added of an operation is an estimate of how much time that the operation is used for assembly. It is expressed as a percentage. If no time of the operation is spent on assembly, the value added can be specified as 0%.

Value added can be used on an operation that has its time mode defined as Estimated time or Analyzed time. For value added based on Estimated time, the value is defined in the operation's Properties dialog box. For value added based on Analyzed time, the value is defined using Edit Time Analysis. See the Time-Motion Study User's Guide for more information.

Sometimes operations have time modes defined as Simulated time or Work instruction. In this case, the value added is the percentage defined in Value Added Ratio on Estimated Time in the Properties dialog box.

Note: This information is only displayed in the Gantt chart when the Display value added ration on system option is selected in Me > Preferences > App Preferences > Simulation > Digital Manufacturing Apps Common Services > Manufacturing Planning Apps Common Services > Process Gantt.

You can display a value added categories bar on top of the system cycle bar. The value added categories are defined on the time analysis of an operation. You can specify the color of each category in Me > Preferences > App Preferences > Simulation > Process Engineering > Time-Motion Study > Value Added (for example, green for value added, red for nonvalue added, and so on). The total value for each category is computed for all the operations in the system.

Note: This information is only displayed when the Display value added categories from Time Analysis on system option is selected in the Me > Preferences > App Preferences > Simulation > Digital Manufacturing Apps Common Services > Manufacturing Planning Apps Common Services > Process Gantt.

This option also enables a value added categories bar to be displayed in the Resource Balancing panel.

The length of the time bar for a Point Fastening operation depends if it is related to an item with fasteners or fastener groups linked to it or not.

Two fastener models are supported in Process Planning and Fastener Planning: the fastener model and the fastener group model.

Both fastener models handle "spots" that define the position of fasteners. A spot is where a fastening action is done, which is important to describe the Point Fastening operation.

• In the fastener model, there is one spot per fastener.
• In the fastener group model, there can be one of more spots per fastener.

The length of the time bar for a Point Fastening operation is as follows:

• A Point Fastening operation can be created in Process Planning or Fastener Planning from scratch with no related item. In this case, the time bar value in the Gantt chart is the estimated time (10sec, par default).
• If a Point Fastening operation is related to an item with no fasteners linked to it, the time bar value is the estimated time (10sec).
• A Point Fastening operation can be related to an item with one or more fasteners or fastener groups linked to it. In this case, then the time bar value is an estimated time computed as follows:

  Estimated time = time per fastening * number of spots

  The time per fastening is 2.5sec by default.