Abstract: The invention relates to an elevator arrangement comprising an elevator with an elevator a control system, a safety system and an inspection or maintenance mode, which elevator having an elevator car arranged to run up and down in an elevator shaft along guide rails, and which elevator car is equipped with a roof. The roof of the elevator car is arranged to open outwards from the elevator car in order to form a natural safe space inside the elevator car at least during inspection and maintenance tasks.

Abstract: Method for controlling the elevators in an elevator bank in a building divided into zones has a plurality of floors via a process whereby destination floor calls are issued to the elevators by destination floor call input devices in the lobby of departure and the calls are distributed internally among different zones in the building by the elevator group control system, the elevators and the floors to be served being divided dynamically within the aforesaid elevator group control system into aforesaid zones, varying the numbers of elevators and the zone limits (r) according to traffic forecasts and transportation need.

Abstract: Method for controlling the elevators in an elevator bank in a building divided into zones comprising a plurality of floors via a process whereby destination floor calls are issued to the elevators by means of destination floor call input devices in the lobby of departure and the calls are distributed internally among different zones in the building by the elevator group control system, the elevators and the floors to be served being divided dynamically within the aforesaid elevator group control system into aforesaid zones, varying the numbers of elevators and the zone limits (r) according to traffic forecasts and transportation need.

Abstract: The protected network consists of a signal bus provided with terminal impedances and connected via impedances to the supply voltage (+VIN) and signal ground (GND), and signal devices which are connected to the bus. To protect the network, the voltages on the bus are monitored, and the bus impedance is measured by means of a test pulse. If either the measured voltages, impedance, or both are outside an allowed range, at least the supply voltage (+VIN) of the signal devices is disconnected.