Abstract: A transmission apparatus includes a first communication unit, a second communication unit, a detection unit, a control unit, and a selection unit. The first communication unit uses a first path for communication, when electric power is supplied. The second communication unit uses a second path for communication, when electric power is supplied. The detection unit detects a fault predictive sign. The control unit supplies no electric power to the second communication unit when the detection unit does not detect the fault predictive sign. The control unit starts supplying electric power to the second communication unit and performs normality confirmation of the second path when the detection unit detects the fault predictive sign, before switching from the first path to the second path.

Abstract: A method and system for automatically attaching a sub-assembly such as a strut to a main assembly such as a vehicle body frame in a production line. The method involves the steps of moving the sub-assembly including a separable engagement means to a predetermined location of the main assembly, anchoring the engagement means of the sub-assembly to a positioning part located at the predetermined location of the main assembly so as to temporarily attach the sub-assembly to the main assembly, moving an automatic fastening tool to the opposite side of the predetermined location of the main assembly to which the sub-assembly is attached and tightening fasteners in the automatic fastening tool onto the sub-assembly so as to permanently attach the sub-assembly to the predetermined location of the main assembly. The engagement means can then be removed.

Abstract: A method and system for automatically attaching a sub-assembly such as a strut assembly of a strut-type front suspension to a main assembly such as a vehicle body which is transported on a conveyor belt.