1. A robot safety system comprising: a robot having at least one mobile component instrumented with a plurality of proximity sensors adapted to develop an intrusion detection zone substantially surrounding the mobile component, each sensor adapted to detect an intrusion into a respective portion of the zone; a model of at least one predefined robot application comprising a set of accepted intrusions during each of a plurality of predefined time intervals comprising the application; a controller adapted to: control the robot to execute the application; during each time interval of the application, monitor for detected intrusions; and trigger an interrupt of the application in response to a detected intrusion not in the set of accepted intrusions for the respective time interval.