xPC Target

Signal Logging with xPC Target Graphical Interface

Exporting data with the xPC Target scope window does not require you to add outport blocks to your Simulink model and activate the logging of signals. You can select which signals to collect, and you can capture unexpected outputs during a run.

This procedure uses a scope window as a graphical interface to move data from the last data package collected to the MATLAB workspace. For information on exporting data using outport blocks, a scope object and the properties Data and Time, see Chapter 8, Scope Object Reference..

After you complete a run with a scope, you can move data from the last data package collected to the MATLAB workspace. This procedure uses the Simulink model xpcosc.mdl as an example, and assumes you have completed a run with the target application.

1. In the xPC Target Scope window, and from the Plot menu, click Variable Name for Export.

The Variable Name for Export dialog box opens.

2. In the Data and Time text boxes, enter the name of the MATLAB variables to contain the data from the scope data package. Click the Apply button, and then click the Close button.

The default name for the time vector is scopen_time, and the default name for the signal vector is scopen_data where n is the scope number.

3. In the Scope window, click the Export button. You can export data regardless of whether a scope is started or stopped.
4. In the MATLAB window, type

whos

MATLAB displays a list of variables and their description. For example

Name              Size         Bytes  Class
  ans               1x1          13958  xpc object
  scope1_data     250x2           4000  double array
  scope1_time     250x1           2000  double array
  t               801x1           6408  double array
  tg                1x1          14002  xpc object
  x               801x2          12816  double array
  y               801x1           6408  double array

Grand total is 5828 elements using 59592 bytes

You can now save or further analyze the data using the MATLAB variables.

5. Type

plot(scope1_time, scope1_data)

MATLAB plots the variables scope1_time and scope1_data in a new widnow

Signal Logging

Signal Logging with MATLAB Commands