How can i create open loop system using simulink?

how can i create closed loop system..now i already have an open loop simulink model. i don't know what block that i can change with the constant because i want to add a controller.

Answer 1

[Sebastian Castro]

You can use a PID Controller block and put it in a feedback loop as shown in the following link:

http://www.mathworks.com/help/simulink/slref/pidcontroller.html

- Sebastian

Answer 2

[nadhirah jamaluddin]

how i can create Open-loop Transmitter Synchronization using simulink matlab