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Master-slave signal transfer system for elevator
| Details |
Inventors: Ando, Hiroshi; Tanino, Junichi;
Assignee: Mitsubishi Denki Kabushiki Kaisha (JP)
Primary Examiner: Ruggiero; Joseph
Assistant Examiner:
Attorney, Agent or Firm: Leydig, Voit & Mayer
A signal transfer system for an elevator including a master station and a plurality of slave stations, each slave station having provision for generating call signals and illuminating a call registratioin lamp. The master station generates a call registration signal in response to cage call and hall call signals. Each slave station also includes a timer which measures the time interval between transmission of a hall or cage call signal and a call registration signal. When the call registration signal is not received within a predetermined period of time, the respective slave station retransmits the hall or cage call signal. The call registration lamp is extinguished if the slave station has not received the call registration signal after a predetermined number of signal retransmissions. |
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DETAILED DESCRIPTION This invention has been made in order to solve the problems mentioned above, and has for its object to provide a signal transfer system for an elevator in which, even when a call having occurred in a slave station is not transmitted to a master station, a cage can be allocated subject to a temporary fault, and in which, when a call registration signal is not received from the master station, an abnormality can be displayed for a user.
A signal transfer system for an elevator according to this invention furnishes each of slave stations with a timer which starts a timekeeping operation when the slave station transmits a call signal to a master station, reply detection means adapted to operate when a call registration signal from the master station is not sent as a reply within a predetermined time since the transmission of the call signal from the slave station, and abnormality detection means for retransmitting the call signal to the master station when the reply detection means operates, and for flickering or putting out a call registration lamp already lit up when the call registration signal is not received in spite of retransmitting the call signal a predetermined number of times.
In this invention, when a call has occurred, the slave station lights up the call registration lamp and transmits the call signal to the master station, and when the call registration signal from the master station is not thereafter sent as the reply within the predetermined time, the slane station retransmits the call signal.
Therefore, subject to a temporary fault, the call signal transferred to the master station is retransmitted the predetermined number of times.
In addition, when the call registration signal is not sent as the reply in spite of retransmitting the call signal the predetermined number of times, the call registration lamp is flickered or put out, whereby the occurrence of a serious fault which is not temporary is displayed for a user.
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