Logging and Accessibility Options
Select the Logging and accessibility tab on the Signal Properties dialog box to display controls that enable you to specify signal logging and accessibility options for this signal.
Log signal data
Select this option to cause Simulink® software to save this signal's values to the MATLAB® workspace during simulation. See Export Signal Data Using Signal Logging for details.
To set this option programmatically, use the port parameter DataLogging.
See Programmatic Interface.
Test point
Select this option to designate this signal as a test point. To set this property
programmatically, use the port parameter TestPoint. See Configure Signals as Test Points for details.
Logging name
This pair of controls, consisting of a list box and an edit field, specifies the name associated with logged signal data.
Simulink software uses the signal's signal name as its
logging name by default. To specify a custom logging name, select Custom from
the list box and enter the custom name in the adjacent edit field.
To set these properties programmatically, use the port parameters DataLoggingNameMode and DataLoggingName.
See Signal-Specific Logging Name Specified Programmatically.
Data
This group of controls enables you to limit the amount of data that Simulink software logs for this signal.
The options are as follows.
Limit data points to last
Discard all but the last N data points where N is
the number entered in the adjacent edit field.
To set these properties programmatically, use the port parameters
DataLoggingLimitDataPoints and
DataLoggingMaxPoints. To set signal properties
programmatically by using port parameters, see Signal Properties.
When you specify a limit for the number of data points, signal data appears in
the Simulation Data Inspector and on Dashboard Scope blocks when a simulation
pauses or completes, with only the last N data points
displayed. Other visualization Dashboard blocks are disabled, with a warning
message displayed on the block.
Decimation
Log every Nth data point where N is
the number entered in the adjacent edit field. For example, suppose
that your model uses a fixed-step solver with a step size of 0.1
s. if you select this option and accept the default decimation
value (2), Simulink software records data
points for this signal at times 0.0, 0.2, 0.4,
etc.
To set these properties programmatically, use the port parameters
DataLoggingDecimateData and
DataLoggingDecimation. To set signal properties
programmatically by using port parameters, see Signal Properties.
The Decimation value you specify applies to the data sent to the Simulation Data Inspector and to Dashboard blocks in your model.