Taken from the FRA Competition Regulations

Knockout
Any robot that remains stationary for more than 30 seconds without being in contact with another robot will
be deemed to have been knocked out. This rule will also apply to any robot that becomes trapped by any
part of the arena or arena hazards, including the pit. Clusterbots, those that have two or more independent
fighting segments, if one segment becomes immobile and or is completely damaged the complete machine
will be deemed knocked out. Robots in the pit at the end of the fight shall be deemed knocked out.