Save Money
Testing a real plant can be very expensive. It may require many costly prototypes, the running costs may be high or expensive safety precautions may have to be taken. HIL simulation can be a real money saver when testing expensive machinery.
Another money saver comes from the working hours. HIL simulation will normally require more work during the early stages of design but save a lot of work during the implementation phase of a design. Working hours during implementation are generally much more costly than working hours during the early phases, especially if the implementation is at remote locations.