The present invention provides a video surveillance system, having a video camera; a motor operable to move the video camera; and a processor monitoring a value of a signal provided to the motor, the processor terminating the signal to the motor when the monitored signal value exceeds a predetermined value for a predetermined period of time. A network may be coupled to the processor for communication of the signal termination. The processor may reinitiate a signal transmission to the motor sufficient to maintain a position of the motor after a predetermined period of time, and the processor may monitor the signal transmission and adjust at least one of a zoom setting and focus setting of the video camera based at least in part on the monitored signal.

A detection device and a detection method are provided for robot-induced loads that can act upon the human body in contact with the robot during a working process. The robot-induced loads, in particular forces, are measured by the measuring device (16) of an external sensing device (2). The measuring device (16) is suitably positioned and oriented in this process in the working area of an industrial robot (3) by means of a positioning device (15).

A human-collaborative robot system includes a detection unit that directly or indirectly detects a physical quantity which is changed in response to contact force applied to a robot when the robot comes in contact with an external environment, and a stop command unit that compares the physical quantity detected by the detection unit with a first threshold value and a second threshold value greater than the first threshold value, stops the robot according to a predetermined stop method when the physical quantity is equal to or greater than the first threshold value and is smaller than the second threshold value, and stops the robot in a shorter period of time as compared with the predetermined stop method when the physical quantity is equal to or greater than the second threshold value.