An elevator monitoring system includes a monitoring controller for communicating with a remote monitoring installation. The monitoring controller has a signal input for connecting the monitoring controller to a sensor system of the elevator monitoring system. The sensor system includes a first sensor module for determining a state of an elevator controller of an elevator system monitored by the elevator monitoring system, and a second sensor module for determining movement information of the monitored elevator system. The sensor system combines an output state of the first sensor module and an output state of the second sensor module into a single output state by a logical AND operation and provides this single output state as an input for the signal input.