[NullAshton]

Ion cannons disable all the systems of a ship for a few seconds. When Hoth's ion cannon hit the star destroyer, this disabled all of the systems, including engines, weapons, and life support. However, all of those systems come back after a while. Ion cannons could be on a large weapon platform, have a high reload rate of about 3-5, and have disrupt reload times. The cannon would delay a ship from firing all of its weapons by an additional 5-10 combat turns.