IEEE Symbols

Parent page: Schematic Objects

A placed IEEE Symbol (Sigma)


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


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

  • Click Home | Place |  then choose the required symbol from the sub-menu.

The range of available IEEE Symbols


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 access an associated properties dialog, from where properties for the symbol can be changed on-the-fly.
  • 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 symbol 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 respectively.
  • Press the + or - keys (on the numeric keypad) to enlarge or shrink the symbol.

While attributes can be modified during placement (Tab to bring up associated properties dialog), keep in mind that these will become the default settings for further placement.

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 respectively), or resized (+/- keys on numeric keypad).

An object that has its Locked property enabled cannot be selected or graphically edited. Double-click on the locked object directly then disable the Locked property to graphically edit the object.

Non-Graphical Editing

The following methods of non-graphical editing are available:

Via an Associated Properties Dialog

Dialog page: IEEE Symbol

This method of editing uses the IEEE Symbol dialog to modify the properties of an IEEE symbol object.

The IEEE Symbol dialog

The dialog can be accessed during placement by pressing the Tab key.

After placement, the dialog can be accessed in one of the following ways:

  • Double-click on the placed IEEE symbol object.
  • Place the cursor over the IEEE symbol object, right-click then choose Properties from the context menu.

Not only can the dialog be used to change properties for the current IEEE symbol, it can also be used to change the symbol to a completely different one by choosing the required new symbol type from the Symbol drop-down field.

Via the SCHLIB Inspector Panel

Panel page: SCHLIB Inspector

The SCHLIB Inspector panel enables you to interrogate and edit the properties of one or more design objects in the active document.

You are reporting an issue with the following selected text and/or image within the active document: