Stimulation system and method for monitoring an elevator system

A stimulation system (301) for monitoring an elevator system, the elevator system having an elevator car (103, 203) with an input unit (230, 330) for providing operational signals to an elevator controller (115) of the elevator system and having sensors (243, 245) for detecting an operating state of the elevator car (203) and outputting corresponding detection signals, the stimulation system (301) comprising:

• a main controller (302) having a trigger output (312) for sending trigger signals and configurable to receive the detection signals from the sensors;
• and
• an activation controller (304) connectable to the input unit of the elevator car and having a trigger input (316) for receiving trigger signals, the trigger input connected to the trigger output of the main controller;
• wherein the activation controller (304) is configured to, when connected to the input unit,
• cause (454, 458, 462, 466, 468), in response to a trigger signal (406) received on the trigger input, activation of predetermined operational signals (562, 564, 566, 572, 574) at the input unit;
• and
• wherein the main controller (302) is configured to, when configured to receive the detection signals from the sensors,
• send (404) the trigger signal over the trigger output, and
• determine (410, 414) based on the detection signals whether at least one change of the operating state occurs in accordance with the at least one predetermined operational signal.