Altium NEXUS Documentation

IEEE Symbols

Modified by Susan Riege on Mar 20, 2019
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Parent page: Schematic Objects

A placed IEEE Symbol (Sigma)

Summary

IEEE symbols are non-electrical drawing primitives. They are used for representing logic functions or devices. These symbols enable users to understand the logic characteristics of these functions or devices without requiring specific knowledge of their internal characteristics.

Availability

IEEE Symbol objects are available for placement only in the Schematic Library Editor. A total of 34 symbols are available for placement in the following ways:

  • Choose Place » IEEE Symbols from the main menus.
  • Right-click then choose Place » IEEE Symbols from the context menu.
  • Click the  button on the Utilities toolbar.

The IEEE Symbols available for placement are shown in the image below.

Placement

After launching a command, the cursor will change to a cross-hair and you will enter IEEE symbol placement mode. The chosen IEEE symbol will appear floating on the cursor.

  1. Position the object then click or press Enter to effect placement.
  2. Continue placing further symbols or right-click or press Esc to exit placement mode.

Additional actions that can be performed during placement are:

  • Press the Tab key to pause the placement and access the IEEE Symbol mode of the Properties panel in which its properties can be changed on-the-fly. Click the workspace pause button overlay () to resume placement.
  • 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 ellipse counterclockwise or Shift+Spacebar for clockwise rotation. Rotation is in increments of 90°.
  • Press the X or Y keys to mirror the symbol along the X-axis or Y-axis.
  • Press the + or - keys (on the numeric keypad) to enlarge or shrink the symbol.
While attributes can be modified during placement (Tab to access 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.

Graphical Editing

​This method of editing allows you to select a placed IEEE symbol object directly in the workspace and change its location or orientation graphically. IEEE symbols are fixed with respect to their shape and can be resized only through use of the relevant keyboard shortcuts. As such, editing handles are not available when the IEEE symbol object is selected.

A selected IEEE Symbol (Sigma)

Click anywhere inside the dashed box and drag to reposition the symbol as required. While dragging, the symbol can be rotated (Spacebar/Shift+Spacebar), mirrored (X or Y keys to mirror along the X-axis or Y-axis), or resized (+/- keys on numeric keypad).

If attempting to graphically modify an object that has its Locked property enabled, a dialog will appear asking for confirmation to proceed with the edit. If the Protect Locked Objects option is enabled on the Schematic – Graphical Editing page of the Preferences dialog, and the Locked option for that design object is enabled as well, then that object cannot be selected or graphically edited. Click the locked object to select it then disable the Locked property in the List panel or disable the Protect Locked Objects option to graphically edit the object.

Non-Graphical Editing

The following methods of non-graphical editing are available:

Via the Properties Panel

Properties page: IEEE Symbol Properties

This method of editing uses the associated Properties panel mode to modify the properties of an IEEE Symbol object.

The IEEE Symbol mode of the Properties panel

During placement, the IEEE Symbol mode of the Properties panel can be accessed by pressing the Tab key.

After placement, the IEEE Symbol mode of the Properties panel can be accessed in one of the following ways:

  • Double-click on the placed IEEE Symbol.
  • Place the cursor over the IEEE Symbol then right-click and choose Properties from the context menu.
  • If the Properties panel is already active, select the IEEE Symbol object.
The IEEE Symbol properties can be accessed prior to entering placement mode from the Schematic - Defaults of the Preferences dialog. This allows the default properties for the IEEE Symbol object to be changed, which will be applied when placing subsequent ellipses.

Editing Multiple objects

The Properties panel supports multiple object editing, where the property settings that are identical in all currently selected objects may be modified. When multiples of the same object type are selected manually, via the Find Similar Objects dialog or through a Filter or List panel, a Properties panel field entry that is not shown as an asterisk (*) can be edited for all selected objects.

Via the SCHLIB List Panel

Panel pages: SCHLIB List, SCHLIB Filter

The SCHLIB List panel allows you to display design objects from one or more documents in tabular format, enabling quick inspection and modification of object attributes. Used in conjunction with appropriate filtering - by using the SCHLIB Filter panel, or the Find Similar Objects dialog - it enables the display of just those objects falling under the scope of the active filter – allowing you to target and edit multiple design objects with greater accuracy and efficiency.

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