When an electronic circuit has been fully drawn or captured, it is transferred to a PCB layout program such as Ultiboard. Often times during the PCB layout process, additional components and/or nets are added such as mounting holes, or test points.
Back annotation is the process of sending PCB layout changes to its corresponding schematic. NI Ultiboard automates the process of back annotation with a few clicks of the mouse. Forward annotation is the process of sending schematic changes to a corresponding PCB layout. For a detailed tutorial on how to forward annotate from Multisim, please see How to Forward Annotate from Multisim to Ultiboard.
The PCB referred to here was created from the example schematic available in the samples directory found in your base Multisim installation path. (<installation path>\Samples\SpeechFilter.ms10).
Assume that you have decided to remove R7 from the layout. You will first delete the footprint in the sample layout and then annotate the corresponding Multisim schematic to reflect change.
Figure 1: Sample Ultiboard Layout
Delete R7 from the PCB Layout.
To back annotate this change:
Resistor R7 has been deleted from the schematic.
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