Monitoring device for an elevator system having an elevator car and having an electromechanical braking device arranged on the elevator car for braking the elevator car, comprising - at least a first sensor and a second sensor for detecting a first measurement variable dependent on a motion of the elevator car and for detecting a second measurement variable, the first measurement variable and the second measurement variable corresponding to different motion variables (a, v, s) of the elevator car, which different motion variables (a, v, s) are in a mathematically defined relationship, - at least one tester that checks the first measurement variable and the second measurement variable for plausibility, - at least one data storage unit, the data storage unit storing at least one limit value or at least one specification for determining the at least one limit value, - at least one calculation algorithm for calculating at least one actual travel parameter for the elevator car as a function of the first measurement variable and the second measurement variable, - at least one comparator that compares at least one of the first measurement variable, the second measurable variable, or the actual travel parameter with the at least one limit value, - at least one signal output that indicates that the limit value has been reached or exceeded or indicates a violation of plausibility, the tester for the electronic monitoring device, which checks the first measurement variable and the second measurement variable for plausibility, compares the first measurement variable with the second measurement variable and outputs an "OK" status signal if the two measurement variables match and outputs the "NOT_OK" status signal if they do not match, the check of the two measurement variables including: - when a completed path interval is registered, comparing, taking into account an associated time, the extent to which the path traveled corresponds to the acceleration detected over this time, and/or - comparing the extent to which the accelerations detected over a time period agree with a corresponding detection of path increments, characterized in that if the tester outputs the "NOT_OK" status signal, the at least one signal output of the electronic monitoring device indicates the violation of plausibility in a time delayed manner, the time delay delaying the indication of the signal output until the elevator car has reached a next stop; or the at least one signal output of the electronic monitoring device includes a status signal output, by means of which the "NOT OK" status signal may be transmitted to an elevator control unit, for example, the elevator control unit then being able to move the elevator car to a main stop and halt the elevator system there. - at least a first sensor and a second sensor for detecting a first measurement variable dependent on a motion of the elevator car and for detecting a second measurement variable, the first measurement variable and the second measurement variable corresponding to different motion variables (a, v, s) of the elevator car, which different motion variables (a, v, s) are in a mathematically defined relationship, - at least one tester that checks the first measurement variable and the second measurement variable for plausibility, - at least one data storage unit, the data storage unit storing at least one limit value or at least one specification for determining the at least one limit value, - at least one calculation algorithm for calculating at least one actual travel parameter for the elevator car as a function of the first measurement variable and the second measurement variable, - at least one comparator that compares at least one of the first measurement variable, the second measurable variable, or the actual travel parameter with the at least one limit value, - at least one signal output that indicates that the limit value has been reached or exceeded or indicates a violation of plausibility, the tester for the electronic monitoring device, which checks the first measurement variable and the second measurement variable for plausibility, compares the first measurement variable with the second measurement variable and outputs an "OK" status signal if the two measurement variables match and outputs the "NOT_OK" status signal if they do not match, the check of the two measurement variables including: - when a completed path interval is registered, comparing, taking into account an associated time, the extent to which the path traveled corresponds to the acceleration detected over this time, and/or - comparing the extent to which the accelerations detected over a time period agree with a corresponding detection of path increments, - when a completed path interval is registered, comparing, taking into account an associated time, the extent to which the path traveled corresponds to the acceleration detected over this time, and/or - comparing the extent to which the accelerations detected over a time period agree with a corresponding detection of path increments, characterized in that if the tester outputs the "NOT_OK" status signal, the at least one signal output of the electronic monitoring device indicates the violation of plausibility in a time delayed manner, the time delay delaying the indication of the signal output until the elevator car has reached a next stop; or the at least one signal output of the electronic monitoring device includes a status signal output, by means of which the "NOT OK" status signal may be transmitted to an elevator control unit, for example, the elevator control unit then being able to move the elevator car to a main stop and halt the elevator system there.