An automated storage and retrieval system includes a rail system with perpendicular tracks in X and Y direction. The storage and retrieval system includes a plurality of remotely operated container handling vehicles configured to move laterally on the rail system; and a main control system using a first communication system for communicating with the plurality of remotely operated container handling vehicles. The main control system monitors and controls the movement of the plurality of container handling vehicles via the first communication system. At least one service vehicle is movable on the rail system. The at least one service vehicle is configured to bring a malfunctioning remotely operated container handling vehicle to a service area outside of the rail system where the remotely operated container handling vehicles operate. The system further includes a secondary control system using a second communication system. The second communication system is independent of the main communication system. The secondary control system is communicating with the at least one service vehicle on the rail system such as to monitor and control the movement of the at least one service vehicle.