If you are using a Speedgoat I/O module, contact Speedgoat technical
Display the input/output behavior of the board by using an external instrument, such as an oscilloscope or logic analyzer.
Check that you have configured the I/O board driver according to the manufacturer data sheet.
Check that you are using the latest version of the I/O board driver and of the Simulink® Real-Time™ software. See Install Simulink Real-Time Software Updates.
When you run the real-time application on a different target computer, check that the behavior persists.
When you install another instance of the I/O board in the target computer, check that the behavior persists.
From the manufacturer website, download the manufacturer I/O driver and diagnostic software. Install the driver and software on your computer. Use the manufacturer software to test the I/O board with the manufacturer driver.
Report the issue to MathWorks® Support