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Created: 17.01.2023 | Updated: 17.01.2023

Parent page: Capturing Your Design Idea as a Schematic

Numbering schematic sheets in a project allows you to take control over the sheet designation and store them as parameters within the respective schematic documents. The special string feature (=SheetNumber, =DocumentNumber, =SheetTotal) can then be used to display these values on the sheet (in the sheet's title block, for example) as text objects. The numbering does not alter component designators but rather Schematic Sheet Designators (numbers). Conceptually, it is therefore related to the general concept of design annotation.

Sheet Numbering

Sheet numbering is accessed by clicking Tools » Annotation » Number Schematic Sheets from the main menus to open the Sheet Numbering For Project dialog.

Use the Sheet Numbering For Project dialog to number and organize the schematic sheets in a project.
Use the Sheet Numbering For Project dialog to number and organize the schematic sheets in a project.

  • Sheet Grid - lists each of the schematic sheets in the active design project. Each sheet is presented in terms of the following:
    • Schematic Document - the name of the document.
    • SheetNumber - the current value for the document's SheetNumber document-level parameter.
    • DocumentNumber - the current value for the document's DocumentNumber document-level parameter.
    • SheetTotal - the current value for the document's SheetTotal document-level parameter. This field is updated only by clicking the Update Sheet Count button.
The SheetNumber and DocumentNumber fields can be edited directly in the grid. Click once to focus the cell, and then again to enter edit mode. Use commands available on the right-click menu to copy/paste values or edit multiple selected cells. For the latter, select the cells required then right-click on one cell and choose the Edit command. Enter the new value then press Enter - the value will be used for each cell in the selection.
A field that has been modified with respect to its value will be distinguished by the use of a blue triangle in its top-right corner. Changes will be effected once the OK button is clicked.
  • Automatic Sheet Numbering (Project Options) - enable this option to apply automatic numbering to the schematic sheets in the project. This allows control over the sheet designation and stores them as parameters within the respective schematic documents. This option can also be enabled from the Project Options - Options dialog. 
  • Auto Sheet Number - click this button to apply sheet numbering, in accordance with the chosen numbering scheme/method. Click the drop-down arrow associated to the button to access the available numbering options as follows:
    • Select Numbering Scheme - choose one of the following schemes:
      • Display Order - the sheets are numbered in the order they are displayed.
      • Sheets Hierarchical Structure - Depth First - the sheets are numbered from the top level into each branch. The top level is numbered first and then the first branch under the top level is numbered completely, then the second branch, and so on.
      • Sheets Hierarchical Structure - Breadth First - the sheets are numbered according to their level in the hierarchy. Top level is numbered first, all second levels are numbered next, and so on.
    • Select Numbering Method - choose either Increasing or Decreasing sequential values, when numbering the sheets.
  • Auto Document Number - click this button to apply document numbering, in accordance with the chosen numbering scheme/method. Click the drop-down arrow associated to the button to access the available numbering options as follows:
    • Select Numbering Scheme - choose one of the following schemes:
      • Display Order - the documents are numbered in the order they are displayed.
      • Sheets Hierarchical Structure - Depth First - the documents are numbered from the top level into each branch. The top level is numbered first and then the first branch under the top level is numbered completely, then the second branch, and so on.
      • Sheets Hierarchical Structure - Breadth First - the documents are numbered according to their level in the hierarchy. Top level is numbered first, all second levels are numbered next, and so on.
    • Select Numbering Method - choose either Increasing or Decreasing sequential values, when numbering the documents.
    • Parameters - use the following options to define Prefix and Postfix values in relation to the document numbering:
      • Prefix - choose a prefix to affix in front of the document dumber. Alpha (A, B, C,…) numerical (1, 2, 3,...) and non numerical (_,*,.,%,...) prefixes are supported including combinations of all of them.
      • Start - choose a numerical value to begin document numbering from.
      • Postfix - choose a postfix to append to the document number. Alpha (A, B, C,…) numerical (1, 2, 3,...) and non numerical (_,*,.,%,...) postfixes are supported including combinations of all of them.
      • Step - choose a value to increment each document number by. For example, if the Start index is set to 1 and the Step value set to 100, the first document number will be 1, the next document number will be 101 (Start + Step), the next one will be 201, and so on.
  • Update Sheet Count - click this button to tally the number of sheets in the current project and place the result in the SheetTotal field for each document. The sheet count will be the total number of sheets in the project, regardless of the numbering scheme selected in either of the previous controls.
  • Move Up / Move Down - use these buttons to move a selected schematic document up or down respectively in the list. This is only relevant when using the Display Order numbering scheme to specify Sheet or Document Numbers.
If an organization has a specific number or naming system that cannot be automated through either the Auto Sheet Numbering or Auto Document Numbering controls, custom sheet names and numbers can be written directly into the SheetNumber or DocumentNumber fields.

The process of using the dialog to number the sheets is explained in the following sections.

Auto Sheet Number

Click Auto Sheet Number in the Sheet Numbering For Project dialog to access a drop-down of sheet numbering options.

The Automatic Sheet Numbering (Project Option) option must be disabled in order to access this field.

Select one of the options in the Select Numbering Scheme:

  • Display Order - select to number the sheets in the same order they are displayed.
  • Sheets Hierarchical Structure - Depth First - select to number the sheets from the top level into each branch. The top-level is numbered first and then the first branch under the top level is numbered completely, then the second branch, etc.
  • Sheets Hierarchical Structure - Breadth First - select to number the sheets according to their level in the hierarchy. The top-level is numbered first then all second levels are numbered next and so on.

Select whether you want the numbers sequentially Increasing or Decreasing in the Select Numbering Method region.

Auto Document Number

Click on Auto Document Number to access a drop-down of document numbering options.

Select one of the options in the Select Numbering Scheme:

  • Display Order - select to number the sheets in the same order they are displayed.
  • Sheets Hierarchical Structure - Depth First - select to number the sheets from the top level into each branch. The top-level is numbered first and then the first branch under the top level is numbered completely, then the second branch, etc.
  • Sheets Hierarchical Structure - Breadth First - ​select to number the sheets according to their level in the hierarchy. The top-level is numbered first then all second levels are numbered next and so on.

Select whether you want the numbers sequentially Increasing or Decreasing in the Select Numbering Method region.

Use the Parameters options to set the sheet numbering parameters.

  • Prefix - choose a prefix to add in front of your Document Number. Alpha (A, B, C, etc.,), numerical (1, 2, 3, etc.,), and non-numerical (_*., %, etc.,) prefixes are supported including any combinations (e.g., alpha-numeric).
  • Start - ​choose a numerical value from which to begin Document Numbering.
  • Postfix - ​choose a postfix to append to the Document Number. Alpha (A, B, C, etc.), numerical (1, 2, 3, etc.,), and non-numerical (_*., %, etc.,) postfixes are supported including any combinations (e.g., alpha-numeric).
  • Step - ​choose a value by which to increment each Document Number. For example, if the Start index is set to 1 and the Step value is set to 100, the first Document Number will be 1, the next will be 101 (Start + Step), the next will be 201, etc.

Update the Sheet Count

Click the Update Sheet Count button to tally the total number of sheets in the current project and place the result in the SheetTotal column. The sheet count will be the total number of sheets in the project regardless of the numbering scheme selected in any of the previous controls.

The Automatic Sheet Numbering (Project Option) option must be disabled in order to access this field.

Use the Move Up and Move Down buttons to move a selected schematic document up or down in the list. This is relevant when using the Display Order numbering scheme to specify Sheet or Document Numbers.

If your organization has a specific number or naming system that cannot be automated through either the Automatic Sheet Number (Project Option)Auto Sheet Numbering or Auto Document Numbering commands, custom sheet names and numbers can be written directly into the SheetNumber or DocumentNumber fields.

Schematic Sheet Numbering and Device Sheets

Sheet or Document Numbers cannot be configured for Device Sheets when they are read-only (default state) and will be cross-hatched in the Sheet Numbering For Project dialog to indicate they cannot be updated, as shown in the image below. When Device Sheets are set as editable, the cross-hatching is removed and Sheet and Document Numbering can be configured as normal.

Automatic Sheet Numbering

The automatic sheet numbering feature can be enabled/disabled using the Automatic Sheet Numbering option on the Options tab of the Project Options dialog and the Automatic Sheet Numbering (Project Option) option in the Sheet Numbering For Project dialog. The option needs to only be enabled in one of the dialogs for automatic sheet numbering to occur. If the option is disabled in both dialogs, the sheets can be manually numbered. 

Automatic sheet numbering can be applied to schematic sheets directly in the Projects panel if one of the above-mentioned options is enabled. Drag and drop schematic sheets in the panel to change the numbering. The sheet numbering displays to the left of the schematic sheet name.

Annotating Compiled Sheets

Annotating compiled sheets allows you to take control over how compiled sheets (physical instances of a sheet) are numbered, similar to the way Sheet Numbering controls how logical sheets are numbered.

For example, consider a design that includes a schematic document called Input channel.SchDoc. The circuitry in that sheet is used eight times within the design so after design compilation, the Input channel.SchDoc will be instantiated eight times (i.e., once for each instance of the circuitry on the physical PCB). Sheet numbering is used to number the Input channel.SchDoc sheet within the logical structure of the design; annotating compiled sheets is done to number the individual instances of that sheet in the physical (compiled) view of the design.

Annotating compiled sheets is accomplished in the Annotate Compiled Sheets dialog, which is accessed by selecting the Tools » Annotation » Annotate Compiled Sheets command from the main menus.

Main Region

This region is a list of the compiled sheets of the current project. Items listed include:

  • Document - the name of the schematic sheet.
  • Hierarchy Path - the location of the schematic sheet.
  • Sheet Number - the number assigned to the listed schematic sheet. To enter a sheet number, click in the Sheet Number column of the desired schematic document then enter the new sheet number.
You can create custom names for your compiled sheets by typing directly into the Sheet Number field. Use any combination of characters (alphanumeric or non-alphanumeric) then click OK to implement your custom annotation.

Additional Controls

  • Annotate Sheet - click the drop-down arrow to access the menu for sheet numbering options. 

  • Numbering Order:
    • Display Order - use this option to annotate the sheets in the order they are displayed.
    • Sheets Hierarchical Structure - Depth First - use this option to annotate the sheets from the top level into each branch. The top level is annotated first, then the first branch under the top level is annotated, then the second branch and so on. The Navigator view of your project shows the compiled (physical) representation of your sheets. When you annotate the sheets Depth First, you annotate each branch of the hierarchical structure at a time.
    • Sheets Hierarchical Structure - Breadth First - use this option to annotate the sheets according to their level in the hierarchy. The top level is annotated first, second levels are annotated next and so on. The Navigator view of your project shows the compiled (physical) representation of your sheets. When you annotate the sheets Breadth First, you annotate the sheets based on their position in the hierarchy. 
  • Numbering Method:
    • Increasing - use this option to number the sheets in ascending order.
    • Decreasing - use this option to number the sheets in descending order.
  • Click the Annotate Sheet button to annotate the sheet(s) after selecting all options. The Sheet Number will be updated to match your selections.
  • Move Up - click to move the selected schematic sheet one row up. 
  • Move Down - click to move the selected schematic sheet one row down. 

Sheet Numbers updated by the Annotate Compiled Sheets dialog are stored in the project's *.Annotation file under the Settings\Annotation Documents sub-folder in the Projects panel. This ensures that annotation information and settings are remembered across project editing sessions.

The Annotate Compiled Sheets dialog treats Device Sheets like any other sheet in the design project and annotates them according to the Annotation options.
The Sheet Number allocated by the Annotate Compiled Sheets dialog can be referenced on printed outputs of the compiled (Physical) sheet using the =SheetNumber special string. This will then be updated in any printed outputs of the design.

Annotate Sheet Options

Click on the Annotate Sheet drop-down to set the Annotate Sheet options.

Numbering Order

  • Display Order - select to annotate the sheets in the same order they are displayed.
  • Sheets Hierarchical Structure - Depth First - select to annotate the sheets from the top level into each branch. The top-level is annotated first and then the first branch under the top-level is annotated completely, then the second branch, etc.
  • Sheets Hierarchical Structure - Breadth First - select to annotate the sheets according to their level in the hierarchy. The top-level is annotated first then all second levels are annotated next and so on.

Additional Functions

  • Select whether you want the numbers sequentially Increasing or Decreasing in the Select Numbering Method region.
  • Use the Move Up and Move Down buttons to move a selected Schematic Document up or down in the list. This is relevant when using the Display Order numbering scheme to specify Sheet or Document Numbers.

Applying Custom Sheet Numbers

Custom Sheet Numbers can be applied to the design by typing directly into the Sheet Number field. Any combination of alphanumeric or non-alphanumeric characters is supported. After entering custom names, click the OK button to apply the changes to the design.

Using Compiled Sheet Annotation in Board Level Annotation

Once the Compiled Sheets have been annotated through the Annotate Compiled Sheets dialog, the $SheetNumber keyword can be used as part of the Naming Scheme in the Board Level Annotation Options dialog. If the project's compiled sheets have not yet been annotated, the sheet numbering defined in the Sheet Numbering For Project dialog will be used by default.

For more information about Board Level Annotation, see the Board Level Annotation page.

Using Compiled Sheet Annotation in your Project

Once you have annotated your compiled sheets, you can place the SheetNumber special string in your project to reference this information.

  • The special string is always displayed; if null, then the parameter name is displayed. 
  • Place a special string where the value =SheetNumber to use your Compiled Sheet Annotation values. You can use special strings in values of parameter properties, text strings, net labels, etc.
  • The Sheet Number allocated by the dialog can be referenced on printed outputs of the compiled (Physical) sheet using the =SheetNumber special string. This will then be updated in any printed outputs of the design.
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