This model shows a unwind drum of a roll-to-roll-process. It demonstrates the capability of the web handling library to test and compare different control strategies. The control input is the brake on the unwind drum. This simulation scenario contains only a part of a web-handling machine and has external excitation of the web speed over time. This model contains 3 different ways to control this input. To set a switch on/off select either controller or feedback component and select/unselect the check box next to parameter ‘k’.