Once the generated code is deployed to the target, it may not execute as expected for several reasons:
•There are timing issues with the data acquisition and actuators
•You may not be able to maintain adequate sample speed
•The code may not fit on the on-chip FLASH or RAM
•The real-world sensor data may not be as precise as expected
•The behavior of the actual plant may be significantly different from the simulated plant
There are different techniques for debugging your diagram depending on your target.