Altium Designer Documentation

CreateSheetSymbolFromSheet

Последнее изменение: Susan Riege; 28.07.2018

Parent page: Schematic Commands

The following pre-packaged resources, derived from this base command, are available:


Applied Parameters: ObjectKind=SheetSymbol

Summary

This command is used to create a new sheet symbol from a chosen schematic sheet, and add sheet entries for each of the ports on that sheet. In this way, you can quickly build up the required structure for your hierarchical schematic designs in bottom-up fashion. A hierarchical design is one where the structure - or sheet-to-sheet relationships - in the design is represented. This is done with sheet symbols, which represent lower sheets in the design hierarchy. The symbol represents the sheet below, and the sheet entries in it represent (or connect to) the ports on the sheet below. The advantage of the hierarchical design is that it shows the reader the structure of the design, and that the connectivity is completely predictable and easily traced since it is always from the child sheet up to the sheet symbol on the parent sheet.

Access

This command is accessed from the Schematic Editor by choosing the Design » Create Sheet Symbol From Sheet command from the main menus.

Use

First, ensure that the schematic document on which you want to place the new sheet symbol is the active document in the main design window.

After launching the command, the Choose Document to Place dialog will open. The dialog lists all candidate schematic documents for the project that can validly be used as the target reference sub-sheet for the new sheet symbol. Choose the required sheet then click OK; the sheet symbol will be created floating on the cursor. Position the symbol then click or press Enter to place. The sheet symbol will have the correct file name to link it to the sub-sheet and will have sheet entries to match each of the ports on the sub-sheet.

Tips

  1. As the sheet symbol is created and placed on the active sheet, this sheet will not be listed in the Choose Document to Place dialog. This is because a sheet symbol cannot reference the same sheet on which it is itself placed.
  2. The electrical I/O Types for the created sheet entries in the new parent sheet symbol will be the same as those for the ports on the originating child sheet.


Applied Parameters: ContextSensitive=True|ObjectKind=SheetSymbol

Summary

This command is used to create a new sheet symbol from a chosen schematic sheet and add sheet entries for each of the ports on that sheet. In this way, you can quickly build up the required structure for your hierarchical schematic designs in bottom-up fashion. A hierarchical design is one where the structure - or sheet-to-sheet relationships - in the design is represented. This is done with sheet symbols, which represent lower sheets in the design hierarchy. The symbol represents the sheet below and the sheet entries in it represent (or connect to) the ports on the sheet below. The advantage of the hierarchical design is that it shows the reader the structure of the design and that the connectivity is completely predictable and easily traced since it is always from the child sheet up to the sheet symbol on the parent sheet.

Access

This command is accessed from the Schematic Editor by right-clicking within the workspace away from any design objects then choosing the Sheet Actions » Create Sheet Symbol From Sheet command from the context menu.

Use

First, ensure that the schematic document on which you want to place the new sheet symbol is the active document in the main design window.

After launching the command, the Choose Document to Place dialog will open. The dialog lists all candidate schematic documents for the project that can validly be used as the target reference sub-sheet for the new sheet symbol. Choose the required sheet then click OK; the sheet symbol will be created floating on the cursor. Position the symbol then click or press Enter to place. The sheet symbol will have the correct file name to link it to the sub-sheet and will have sheet entries to match each of the ports on the sub-sheet.

Tips

  1. As the sheet symbol is created and placed on the active sheet, this sheet will not be listed in the Choose Document to Place dialog. This is because a sheet symbol cannot reference the same sheet on which it is itself placed.
  2. The electrical I/O Types for the created sheet entries in the new parent sheet symbol will be the same as those for the ports on the originating child sheet.


Applied Parameters: SymbolType=Device Sheet|InteractiveCreate=True|InteractivePlace=True

Summary

This command is used to place a Device Sheet Symbol object onto the active document. Device Sheets are building blocks developed with the intent of being re-used in different designs. They usually contain predefined circuits that are commonly used between projects. Device Sheets are stored as normal Schematic Documents in special Device Sheet Folders. They are placed and referenced in your project similarly to a simple component. When the project is compiled, Device Sheets are included in the project hierarchy.

For detailed information about this object type, see Device Sheet Symbol.

Access

This command can be accessed from the Schematic Editor by:

  • Choosing the Place » Device Sheet Symbol command from the main menus.
  • Locating and using the Device Sheet Symbol command () on the Active Bar.
If the command has been recently used from the Active Bar, it will become the active/visible button. Where other commands are available, this is indicated by a triangle at the bottom-right corner of the button. Click and hold on the active button to access a menu of all associated commands for that grouping.
  • Clicking the  button on the Wiring toolbar.
  • Right-clicking in the workspace then choosing the Place » Device Sheet Symbol command from the context menu.

Use

First, ensure that the schematic document on which you want to place the device sheet symbol is the active document in the main design window.

After launching the command, the Select Device Sheet dialog will open. This dialog lists all device sheet folders that have been declared to the software and all device sheets contained therein.

If you have not declared the folder (or folders) where your device sheets are stored, this can be done on-the-fly from the Select Device Sheet dialog. Click the Device Sheet Folders button to access the Device Sheet Folders dialog. Use this dialog to manage the folders of device sheets available to the software.

Select the device sheet required then click OK - the corresponding device sheet symbol for that chosen device sheet will appear floating on the cursor. Position the symbol as required then click or press Enter to effect placement. The device sheet symbol will have the correct file name to link it to the child device sheet and will have sheet entries to match each of the ports on that sheet.

Press the Tab key to access the Properties panel from where properties for the symbol can be changed on-the-fly. Pressing Tab pauses placement allowing you to interact with the panel (or other area of the software) directly. To resume, click the pause symbol that appears over the workspace or press Esc.

Additional actions that can be performed during placement – while the device sheet symbol is still floating on the cursor – are:

  • Press the Alt key to constrain the direction of movement to the horizontal or vertical axis depending on the initial direction of movement.
  • Press the Spacebar to rotate the device sheet symbol counterclockwise or Shift+Spacebar for clockwise rotation. Rotation is in increments of 90°.
  • Press the X or Y keys to mirror the device sheet symbol along the X-axis or Y-axis respectively.

Tips

  1. After a device sheet symbol has been placed in a schematic document, it will act in the same way as a standard sheet symbol, but has different graphical properties to distinguish that it references a Device Sheet. Note that the File Name property for a Device Sheet does not use the .SchDoc file extension.
  2. Be sure to compile your project. Upon compilation, all referenced device sheets will be added to your project tree in the Projects panel. You will notice in the panel that device sheet entries have a different document icon () than normal schematic documents (). This distinguishes them as being referenced sheets rather than sheets explicitly added to your project.
  3. Device sheet folders can also be managed from the Data Management - Device Sheets page of the Preferences dialog. This page also provides additional options, such as controlling whether or not editing of device sheets is allowed (typically a device sheet would be edited outside of the project it is used, and therefore kept Read-Only when brought into a project).
  4. While attributes can be modified during placement (Tab to open the Properties panel), keep in mind that these will become the default settings for further placement unless the Permanent option on the Schematic – Defaults page of the Preferences dialog is enabled. When this option is enabled, changes made will affect only the object being placed and subsequent objects placed during the same placement session.

 

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