About Item to System Assignments

There are a number of ways to assign items to systems. However, the assignments must respect the manufacturing assembly and system structures.

For example, assignments can be done as follows:

• Dragging and dropping an item in the Item Editor to a system tile in the System Editor
• Creating an operation under a system and linking the operation to an item
• Using Assignments Manager
• Using System Assignment Assistant

In the following example, the item to system assignments are done in a consistent manner. The assignments respect the constraints of the manufacturing assembly structure.

However, in the following example, some item to system assignments are inconsistent. The assignments of items P1 and P4 do not respect the constraints of the manufacturing assembly structure. It is not logical that P1 is realized before P4.

It is possible to drag and drop an item from the tree to a system tile or a system node in the tree.

The following table summarizes the behavior for dragging and dropping a Provided Part on a system:

Provided Part implemented by a single object	Provided Part implemented by multiple objects	Drag and Drop used with Ctrl.
The previous implement link is deleted. A new operation is created with a new implement link.	A dialog box appears to indicate that there is already an implement link and requires confirmation before creating a new one. If OK, the Provided Part is assigned to the system.	A new operation is created with a new implement link.

The following table summarizes the behavior for dragging and dropping a Manufacturing Assembly on a system:

Manufacturing Assembly implemented by a single object.	Manufacturing Assembly implemented by multiple objects.	Drag and Drop used with Ctrl.
The previous implement link is deleted. A new operations structure is created with new implement links.	A dialog box appears to indicate that there is already an implement link and requires confirmation before creating a new one. If OK, the Manufacturing Assembly is assigned to the system.	A new operations structure is created with new implement links.

The following table summarizes the behavior for dragging and dropping a Provided Part or a Manufacturing Assembly on an operation:

Provided Part or Manufacturing Assembly implemented by a single object	Provided Part or Manufacturing Assembly implemented by multiple objects	Drag and Drop used with Ctrl.
The previous implement link is deleted, and a new link is created.	A dialog box appears to indicate that there is already an implement link and requires confirmation before creating a new one. If OK, the Provided Part or Manufacturing Assembly is assigned to the operation.	A new implement link is created.

When an item is assigned to a system, an operation is created to implement assigned item. If a Fasten step is assigned to a system, the created operation type depends on the fastener type linked to the item.

If the implemented fastener is a spot fastener, a Point Fastening operation is created.

If the implemented fastener is a bead fastener, a Curve Fastening operation is created.

If the implemented fastener is a bead fastener but the 3D part linked to it is not loaded in session, a Point Fastening operation is created.

A consistency check option is available to prevent the user from creating incoherent item assignments.

This is done by specifying the Check the consistency when creating or modifying Item assignments option in the Me > Preferences > Manufacturing Planning > System Editor tab.

In this case, when the user runs a command that allows assigning or modifying an existing item assignment, a check on the item constraints is done. If an incoherent link is detected, an error message is issued.