Patent ID: 6793061
Filing Date: 2004-09-21
Classification: B66B

Abstract:
An escalator or moving step assembly, comprising:a control unit; a plurality of input/output units each for providing data concerning a respective one of a location and a function of the escalator; a standard bus system, the input/output units being connected to the standard bus system for communicating therewith and the standard bus system communicating with the control unit; a plurality of security position switches each having at least one opening contact; a plurality of security slaves each associated with a respective one of the security position switches and being communicated with the standard bus system; and a security monitor, the security monitor being communicated with the standard bus system and the security monitor and the security slaves operating in cooperation with one another to initiate an intervention in the operation of the escalator in the event that are opening contact of a security is opened, wherein the security monitor comprises a time-dependent overwatch or monitor function which emits an alarm signal in the event that the codes of the entire complement of slaves are not received within a predetermined time window.